93625A117 | 18-8 Stainless Steel Nylon-Insert Locknut

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Cadmium Yellow-Chromate Plated

Corrosion-Resistant Coated

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Fastener Strength Grade/Class

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Unified Standard Class 2B

Unified Standard Class 3B

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Export Control Classification Number (ECCN)

EAR99

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

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Nylon-Insert Locknuts

Versatile yet economical, these are the most commonly used locknuts. The nylon insert grips the screw to prevent loosening from moderate vibration without damaging threads. However, the insert may become brittle if exposed to high temperatures. These locknuts are reusable a handful of times, but the holding power decreases with each use.

High-Strength Steel

Image of Product. Front orientation. Locknuts. Nylon-Insert Locknuts.

Rated Grade 8, Grade C, or Class 10, these locknuts are about 25% stronger than medium-strength steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Zinc-Yellow-Chromate-Plated Steel—With a more durable finish than clear zinc plating, these nuts are suitable for most wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

Black-Oxide Steel—Typically chosen for their appearance, these nuts have a dark, matte coating to create a finished look. They offer minimal corrosion resistance, so they're best for dry environments.

Black-Corrosion-Resistant-Coated Steel—These nuts combine a finished appearance with the rust resistance of stainless steel. The coating has been tested to extreme standards, including 1,000 hours of salt spray resistance, to hold up in wet and outdoor environments. Also known as black luster.

Steel—Best for dry environments since moisture will cause these nuts to rust.

	Thread Size	Wd.	Ht.	Fastener Strength Grade/Class	Insert Max. Temp., ° F	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Yellow-Chromate-Plated Steel



		1/4"-20	7/16"	5/16"	SAE Grade 8	185	—	25	97135A210	00000


		1/4"-28	7/16"	5/16"	SAE Grade 8	185	—	25	97135A215	0000
		5/16"-18	1/2"	11/32"	SAE Grade 8	185	—	20	97135A220	0000
		5/16"-24	1/2"	11/32"	SAE Grade 8	185	—	20	97135A225	0000
		3/8"-16	9/16"	29/64"	SAE Grade 8	185	—	20	97135A230	0000
		3/8"-24	9/16"	29/64"	SAE Grade 8	185	—	20	97135A235	0000
		7/16"-14	5/8"	29/64"	SAE Grade 8	185	—	10	97135A240	0000
		7/16"-20	5/8"	29/64"	SAE Grade 8	185	—	10	97135A245	0000
		1/2"-13	3/4"	19/32"	SAE Grade 8	185	—	10	97135A250	0000
		1/2"-20	3/4"	19/32"	SAE Grade 8	185	—	10	97135A255	0000
		9/16"-12	7/8"	41/64"	SAE Grade 8	185	—	5	97135A260	0000


		9/16"-18	7/8"	41/64"	SAE Grade 8	185	—	5	97135A265	0000
		5/8"-11	15/16"	3/4"	SAE Grade 8	185	—	5	97135A270	0000
		5/8"-18	15/16"	3/4"	SAE Grade 8	185	—	5	97135A275	0000
		3/4"-10	1 1/16"	7/8"	SAE Grade 8	185	—	5	97135A280	0000
		3/4"-16	1 1/16"	7/8"	SAE Grade 8	185	—	5	97135A285	0000
		7/8"-9	1 1/4"	63/64"	SAE Grade 8	185	—	1	97135A290	0000
		7/8"-14	1 1/4"	63/64"	SAE Grade 8	185	—	1	97135A295	0000
		1"-8	1 7/16"	1 3/64"	SAE Grade 8	185	—	1	97135A038	0000
		1"-12	1 7/16"	1 3/64"	SAE Grade 8	185	—	5	97135A401	00000
		1"-14	1 7/16"	1 3/64"	SAE Grade 8	185	—	1	97135A059	0000


		1 1/8"-7	1 5/8"	1 11/64"	SAE Grade 8	185	—	1	97135A350	00000
		1 1/8"-12	1 5/8"	1 11/64"	SAE Grade 8	185	—	1	97135A112	00000
		1 1/4"-7	1 13/16"	1 25/64"	SAE Grade 8	185	—	1	97135A355	00000
		1 1/4"-8	2 1/64"	1 41/64"	SAE Grade 8	185	—	1	97135A404	00000
		1 1/4"-12	1 13/16"	1 25/64"	SAE Grade 8	185	—	1	97135A113	00000
		1 1/2"-6	2 13/64"	1 39/64"	SAE Grade 8	185	—	1	97135A360	00000
		1 1/2"-8	2 25/64"	1 59/64"	SAE Grade 8	185	—	1	97135A407	00000
		1 1/2"-12	2 13/64"	1 39/64"	SAE Grade 8	185	—	1	97135A114	00000
		1 3/4"-5	2 49/64"	2 5/16"	SAE Grade 8	185	—	1	97135A408	00000
		1 3/4"-8	2 49/64"	2 5/16"	SAE Grade 8	185	—	1	97135A411	00000


		1 3/4"-12	2 49/64"	2 5/16"	SAE Grade 8	185	—	1	97135A409	00000
		2"-4 1/2	3 9/64"	2 13/32"	SAE Grade 8	185	—	1	97135A115	00000
		2"-12	3 9/64"	2 13/32"	SAE Grade 8	185	—	1	97135A116	00000
		2 1/4"-8	3 33/64"	2 13/16"	SAE Grade 8	185	—	1	97135A413	00000


		Zinc-Plated Steel



				M4 × 0.7 mm	7 mm	5 mm	Class 10	185	DIN 985	100	94645A101	00000


				M5 × 0.8 mm	8 mm	5 mm	Class 10	185	DIN 985	100	94645A102	00000
				M6 × 1 mm	10 mm	6 mm	Class 10	185	DIN 985	100	94645A205	00000
				M8 × 1 mm	13 mm	8 mm	Class 10	185	DIN 985, ISO 10511	10	94645A111	00000
				M8 × 1.25 mm	13 mm	8 mm	Class 10	185	DIN 985	50	94645A210	00000
				M10 × 1 mm	17 mm	10 mm	Class 10	185	DIN 985, ISO 10511	25	94645A213	0000
				M10 × 1.25 mm	17 mm	10 mm	Class 10	185	DIN 985, ISO 10511	10	94645A112	00000
				M10 × 1.5 mm	17 mm	10 mm	Class 10	185	DIN 985	25	94645A220	00000
				M12 × 1.25 mm	19 mm	12 mm	Class 10	185	DIN 985, ISO 10511	10	94645A113	00000
				M12 × 1.5 mm	19 mm	12 mm	Class 10	185	DIN 985, ISO 10511	10	94645A229	0000
M12 × 1.75 mm				19 mm	12 mm	Class 10	185	DIN 985	10	94645A230	00000


M14 × 1.5 mm	22 mm			14 mm	Class 10	185	DIN 985, ISO 10511	5	94645A115	00000
M14 × 2 mm	22 mm			14 mm	Class 10	185	DIN 985	10	94645A240	00000
M16 × 1.5 mm	24 mm			16 mm	Class 10	185	DIN 985, ISO 10511	1	94645A116	0000
M16 × 2 mm	24 mm			16 mm	Class 10	185	DIN 985	10	94645A250	00000
M18 × 1.5 mm	27 mm			18 mm	Class 10	185	DIN 985, ISO 10511	1	94645A117	0000
M18 × 2.5 mm	27 mm			18.5 mm	Class 10	185	DIN 985	5	94645A260	00000
M20 × 1.5 mm	30 mm			20 mm	Class 10	185	DIN 985, ISO 10511	1	94645A118	0000
M20 × 2 mm	30 mm			20 mm	Class 10	185	DIN 985, ISO 10511	1	94645A119	00000
M20 × 2.5 mm	30 mm			20 mm	Class 10	185	DIN 985	5	94645A270	00000
M22 × 1.5 mm	32 mm			22 mm	Class 10	185	DIN 985, ISO 10511	1	94645A121	00000


M22 × 2.5 mm	32 mm			22 mm	Class 10	185	DIN 985	1	94645A310	0000
M24 × 1.5 mm	36 mm			24 mm	Class 10	185	DIN 985, ISO 10511	1	94645A122	00000
M24 × 2 mm	36 mm			24 mm	Class 10	185	DIN 985, ISO 10511	1	94645A123	00000
M24 × 3 mm	36 mm			24 mm	Class 10	185	DIN 985	1	94645A280	0000
M27 × 3 mm	41 mm			27 mm	Class 10	185	DIN 985	1	94645A320	00000
M30 × 2 mm	46 mm			30 mm	Class 10	185	DIN 985, ISO 10511	1	94645A124	00000
M30 × 3.5 mm	46 mm			30 mm	Class 10	185	DIN 985	1	94645A330	00000
M33 × 3.5 mm	50 mm			33 mm	Class 10	185	DIN 985	1	94645A340	00000
M36 × 3 mm	55 mm			36 mm	Class 10	185	DIN 985, ISO 10511	1	94645A125	00000
M36 × 4 mm	55 mm			36 mm	Class 10	185	DIN 985	1	94645A350	00000


M39 × 4 mm	60 mm			39 mm	Class 10	185	DIN 985	1	94645A360	00000
M42 × 4.5 mm	65 mm			42 mm	Class 10	185	DIN 985	1	94645A370	00000


Black-Oxide Steel



				1/4"-20	7/16"	5/16"	SAE Grade 8	185	—	25	97135A414	0000


				1/4"-28	7/16"	5/16"	SAE Grade 8	185	—	25	97135A415	0000
				5/16"-18	1/2"	11/32"	SAE Grade 8	185	—	20	97135A416	0000
				5/16"-24	1/2"	11/32"	SAE Grade 8	185	—	20	97135A417	0000
				3/8"-16	9/16"	29/64"	SAE Grade 8	185	—	20	97135A418	0000
				3/8"-24	9/16"	29/64"	SAE Grade 8	185	—	20	97135A419	0000
				7/16"-14	5/8"	29/64"	SAE Grade 8	185	—	10	97135A421	0000
				7/16"-20	5/8"	29/64"	SAE Grade 8	185	—	10	97135A422	0000
				1/2"-13	3/4"	19/32"	SAE Grade 8	185	—	10	97135A423	0000
				1/2"-20	3/4"	19/32"	SAE Grade 8	185	—	10	97135A424	0000
				9/16"-12	7/8"	41/64"	SAE Grade 8	185	—	5	97135A425	0000


		9/16"-18		7/8"	41/64"	SAE Grade 8	185	—	5	97135A426	0000
		5/8"-11	15/16"	3/4"	SAE Grade 8	185	—	5	97135A427	0000
		5/8"-18	15/16"	3/4"	SAE Grade 8	185	—	5	97135A428	0000
		3/4"-10	1 1/16"	7/8"	SAE Grade 8	185	—	5	97135A429	0000
		3/4"-16	1 1/16"	7/8"	SAE Grade 8	185	—	5	97135A431	0000
		7/8"-9	1 1/4"	63/64"	SAE Grade 8	185	—	1	97135A432	0000
		7/8"-14	1 1/4"	63/64"	SAE Grade 8	185	—	1	97135A433	0000
		1"-8	1 7/16"	1 3/64"	SAE Grade 8	185	—	1	97135A434	0000
		1"-14	1 7/16"	1 3/64"	SAE Grade 8	185	—	1	97135A435	0000
		1 1/8"-7	1 5/8"	1 11/64"	SAE Grade 8	185	—	1	97135A436	00000


		1 1/8"-12	1 5/8"	1 11/64"	SAE Grade 8	185	—	1	97135A437	00000
		1 1/4"-7	1 13/16"	1 25/64"	SAE Grade 8	185	—	1	97135A438	00000
		1 1/4"-12	1 13/16"	1 25/64"	SAE Grade 8	185	—	1	97135A439	00000
		1 1/2"-6	2 13/64"	1 39/64"	SAE Grade 8	185	—	1	97135A441	00000
		1 1/2"-8	2 25/64"	1 59/64"	SAE Grade 8	185	—	1	97135A448	00000
		1 1/2"-12	2 13/64"	1 39/64"	SAE Grade 8	185	—	1	97135A442	00000
		1 3/4"-5	2 49/64"	2 5/16"	SAE Grade 8	185	—	1	97135A449	00000
		1 3/4"-12	2 49/64"	2 5/16"	SAE Grade 8	185	—	1	97135A451	00000
		2"-8	3 9/64"	2 13/32"	SAE Grade 8	185	—	1	97135A454	00000
		2"-12	3 9/64"	2 13/32"	SAE Grade 8	185	—	1	97135A453	00000


		Black-Corrosion-Resistant-Coated Steel



				M4 × 0.7 mm	7 mm	5 mm	Class 10	185	DIN 985	5	90237A110	00000


				M5 × 0.8 mm	8 mm	5 mm	Class 10	185	DIN 985	5	90237A120	00000
				M6 × 1 mm	10 mm	6 mm	Class 10	185	DIN 985	5	90237A130	00000
				M8 × 1.25 mm	13 mm	8 mm	Class 10	185	DIN 985	5	90237A140	00000
				M10 × 1.5 mm	17 mm	10 mm	Class 10	185	DIN 985	5	90237A150	00000
				M12 × 1.75 mm	19 mm	12 mm	Class 10	185	DIN 985	1	90237A160	0000
				M14 × 2 mm	22 mm	14 mm	Class 10	185	DIN 985	1	90237A170	0000


				Steel



						1/4"-20	7/16"	5/16"	SAE Grade 8	185	—	25	90630A110	0000


1/4"-28						7/16"	5/16"	SAE Grade 8	185	—	25	90630A145	0000
5/16"-18	1/2"					11/32"	SAE Grade 8	185	—	20	90630A115	0000
5/16"-24	1/2"					11/32"	SAE Grade 8	185	—	20	90630A150	0000
3/8"-16	9/16"					29/64"	SAE Grade 8	185	—	20	90630A121	0000
3/8"-24	9/16"					29/64"	SAE Grade 8	185	—	20	90630A155	0000
7/16"-14	5/8"					29/64"	SAE Grade 8	185	—	25	90630A112	00000
7/16"-20	5/8"					29/64"	SAE Grade 8	185	—	25	90630A113	00000
1/2"-13	3/4"					19/32"	SAE Grade 8	185	—	10	90630A125	0000
1/2"-20	3/4"					19/32"	SAE Grade 8	185	—	10	90630A160	0000
9/16"-12	7/8"					41/64"	SAE Grade 8	185	—	5	90630A201	0000


9/16"-18	7/8"					41/64"	SAE Grade 8	185	—	5	90630A202	0000
5/8"-11	15/16"					3/4"	SAE Grade 8	185	—	5	90630A130	0000
5/8"-18	15/16"					3/4"	SAE Grade 8	185	—	5	90630A165	0000
3/4"-10	1 1/16"					7/8"	SAE Grade 8	185	—	5	90630A135	0000
3/4"-16	1 1/16"					7/8"	SAE Grade 8	185	—	5	90630A170	0000
7/8"-9	1 1/4"					63/64"	SAE Grade 8	185	—	1	90630A114	0000
7/8"-14	1 1/4"					63/64"	SAE Grade 8	185	—	1	90630A116	0000
1"-8	1 7/16"					1 3/64"	SAE Grade 8	185	—	1	90630A140	0000
1"-14	1 7/16"					1 3/64"	SAE Grade 8	185	—	1	90630A175	0000
1 1/8"-7	1 5/8"					1 11/64"	SAE Grade 8	185	—	1	90630A203	00000


1 1/8"-12	1 5/8"					1 11/64"	SAE Grade 8	185	—	1	90630A204	00000
1 1/4"-7	2 1/64"					1 41/64"	SAE Grade 8	185	—	1	90630A209	00000
1 1/4"-8	2 1/64"					1 41/64"	SAE Grade 8	185	—	1	90630A211	00000
1 1/4"-12	1 13/16"					1 25/64"	SAE Grade 8	185	—	1	90630A205	00000
1 3/8"-8	2 3/16"					1 51/64"	SAE Grade 8	185	—	1	90630A212	00000
1 1/2"-6	2 3/16"					1 39/64"	SAE Grade 8	185	—	1	90630A206	00000
1 1/2"-8	2 25/64"					1 59/64"	SAE Grade 8	185	—	1	90630A214	00000
1 1/2"-12	2 13/64"					1 39/64"	SAE Grade 8	185	—	1	90630A207	00000
1 3/4"-5	2 49/64"					2 5/16"	SAE Grade 8	185	—	1	90630A215	00000
1 3/4"-8	2 49/64"					2 5/16"	SAE Grade 8	185	—	1	90630A217	00000


1 3/4"-12	2 49/64"					2 5/16"	SAE Grade 8	185	—	1	90630A216	00000
2"-8	3 9/64"					2 13/32"	SAE Grade 8	185	—	1	90630A219	00000
2"-12	3 9/64"					2 13/32"	SAE Grade 8	185	—	1	90630A218	00000
2 1/4"-8	3 33/64"					2 13/16"	SAE Grade 8	185	—	1	90630A221	00000

Medium-Strength Steel

These Grade 5 or Class 8 nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

	Thread Size	Wd.	Ht.	Fastener Strength Grade/Class	Insert Max. Temp., ° F	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Yellow-Chromate-Plated Steel



		M3 × 0.5 mm	5.5 mm	4 mm	Class 8	185	DIN 985, ISO 10511	100	90576A811	000000


		M4 × 0.7 mm	7 mm	5 mm	Class 8	185	DIN 985, ISO 10511	100	90576A812	00000
		M5 × 0.8 mm	8 mm	5 mm	Class 8	185	DIN 985, ISO 10511	100	90576A813	00000
		M6 × 1 mm	10 mm	6 mm	Class 8	185	DIN 985, ISO 10511	100	90576A814	00000
		M8 × 1.25 mm	13 mm	8 mm	Class 8	185	DIN 985, ISO 10511	100	90576A815	00000
		M10 × 1.5 mm	17 mm	10 mm	Class 8	185	DIN 985, ISO 10511	50	90576A816	00000
		M12 × 1.75 mm	19 mm	12 mm	Class 8	185	DIN 985, ISO 10511	25	90576A817	00000
		M14 × 2 mm	22 mm	14 mm	Class 8	185	DIN 985, ISO 10511	25	90576A818	00000
		M16 × 2 mm	24 mm	16 mm	Class 8	185	DIN 985, ISO 10511	10	90576A819	0000
		M18 × 2.5 mm	27 mm	18.5 mm	Class 8	185	DIN 985, ISO 10511	5	90576A821	0000
		M20 × 2.5 mm	30 mm	20 mm	Class 8	185	DIN 985, ISO 10511	5	90576A822	0000


		M22 × 2.5 mm	32 mm	22 mm	Class 8	185	DIN 985, ISO 10511	5	90576A823	00000
		M24 × 3 mm	36 mm	24 mm	Class 8	185	DIN 985, ISO 10511	5	90576A824	00000


		Zinc-Plated Steel



				1/4"-20	7/16"	5/16"	SAE Grade 5	185	—	100	95615A120	0000


				1/4"-28	7/16"	5/16"	SAE Grade 5	185	—	100	95615A130	0000
				5/16"-18	1/2"	11/32"	SAE Grade 5	185	—	100	95615A160	00000
				5/16"-24	1/2"	11/32"	SAE Grade 5	185	—	100	95615A170	00000
				3/8"-16	9/16"	29/64"	SAE Grade 5	185	—	100	95615A140	00000
				3/8"-24	9/16"	29/64"	SAE Grade 5	185	—	100	95615A150	00000
				7/16"-14	5/8"	29/64"	SAE Grade 5	185	—	100	95615A180	00000
				7/16"-20	5/8"	29/64"	SAE Grade 5	185	—	100	95615A190	00000
				1/2"-13	3/4"	19/32"	SAE Grade 5	185	—	50	95615A210	00000
				1/2"-20	3/4"	19/32"	SAE Grade 5	185	—	50	95615A220	00000
				9/16"-12	7/8"	41/64"	SAE Grade 5	185	—	25	95615A230	00000


				9/16"-18	7/8"	41/64"	SAE Grade 5	185	—	25	95615A240	00000
				5/8"-11	15/16"	3/4"	SAE Grade 5	185	—	25	95615A250	00000
				5/8"-18	15/16"	3/4"	SAE Grade 5	185	—	25	95615A260	00000
				3/4"-10	1 1/16"	7/8"	SAE Grade 5	185	—	10	95615A270	0000
				3/4"-16	1 1/16"	7/8"	SAE Grade 5	185	—	10	95615A280	0000
				7/8"-9	1 1/4"	63/64"	SAE Grade 5	185	—	5	95615A290	0000
				7/8"-14	1 1/4"	63/64"	SAE Grade 5	185	—	5	95615A310	00000
				1"-8	1 7/16"	1 3/64"	SAE Grade 5	185	—	5	95615A320	00000
				1"-14	1 7/16"	1 3/64"	SAE Grade 5	185	—	5	95615A330	00000
				1 1/8"-7	1 5/8"	1 11/64"	SAE Grade 5	185	—	5	95615A341	00000


				1 1/4"-7	1 13/16"	1 25/64"	SAE Grade 5	185	—	1	95615A350	00000
				1 1/2"-6	2 13/64"	1 39/64"	SAE Grade 5	185	—	1	90640A420	00000
				M2 × 0.4 mm	4 mm	2.8 mm	Class 8	185	DIN 985	10	90576A211	0000
				M2.5 × 0.45 mm	5 mm	3.8 mm	Class 8	185	DIN 985	50	90576A161	0000
				M3 × 0.5 mm	5.5 mm	4 mm	Class 8	185	DIN 985, ISO 10511	100	90576A102	0000
				M4 × 0.7 mm	7 mm	5 mm	Class 8	185	DIN 985, ISO 10511	100	90576A103	0000
				M5 × 0.8 mm	8 mm	5 mm	Class 8	185	DIN 985, ISO 10511	100	90576A104	0000
				M6 × 1 mm	10 mm	6 mm	Class 8	185	DIN 985, ISO 10511	100	90576A115	0000
				M7 × 1 mm	11 mm	7.5 mm	Class 8	185	DIN 985, ISO 10511	25	90576A212	0000
				M8 × 1 mm	13 mm	8 mm	Class 8	185	DIN 985, ISO 10511	25	90576A116	0000


M8 × 1.25 mm	13 mm			8 mm	Class 8	185	DIN 985, ISO 10511	100	90576A117	00000
M10 × 1 mm	17 mm			10 mm	Class 8	185	DIN 985, ISO 10511	25	90576A131	0000
M10 × 1.25 mm	17 mm			10 mm	Class 8	185	DIN 985, ISO 10511	25	90576A132	00000
M10 × 1.5 mm	17 mm			10 mm	Class 8	185	DIN 985, ISO 10511	50	90576A118	0000
M12 × 1 mm	19 mm			12 mm	Class 8	185	DIN 985, ISO 10511	10	90576A137	0000
M12 × 1.25 mm	19 mm			12 mm	Class 8	185	DIN 985, ISO 10511	25	90576A141	00000
M12 × 1.5 mm	19 mm			12 mm	Class 8	185	DIN 985, ISO 10511	20	90576A144	00000
M12 × 1.75 mm	19 mm			12 mm	Class 8	185	DIN 985, ISO 10511	50	90576A119	00000
M14 × 1.5 mm	22 mm			14 mm	Class 8	185	DIN 985, ISO 10511	10	90576A147	0000
M14 × 2 mm	22 mm			14 mm	Class 8	185	DIN 985, ISO 10511	25	90576A120	00000


M16 × 1.5 mm	24 mm			16 mm	Class 8	185	DIN 985, ISO 10511	10	90576A152	00000
M16 × 2 mm	24 mm			16 mm	Class 8	185	DIN 985, ISO 10511	25	90576A122	00000
M18 × 1.5 mm	27 mm			18.5 mm	Class 8	185	DIN 985, ISO 10511	10	90576A106	00000
M18 × 2.5 mm	27 mm			18.5 mm	Class 8	185	DIN 985, ISO 10511	10	90576A123	00000
M20 × 1.5 mm	30 mm			20 mm	Class 8	185	DIN 985, ISO 10511	5	90576A172	00000
M20 × 2 mm	30 mm			20 mm	Class 8	185	DIN 985, ISO 10511	1	90576A155	0000
M20 × 2.5 mm	30 mm			20 mm	Class 8	185	DIN 985, ISO 10511	10	90576A125	00000
M22 × 1.5 mm	32 mm			22 mm	Class 8	185	DIN 985, ISO 10511	5	90576A299	00000
M22 × 2.5 mm	32 mm			22 mm	Class 8	185	DIN 985, ISO 10511	5	90576A162	00000
M24 × 1.5 mm	36 mm			24 mm	Class 8	185	DIN 985, ISO 10511	1	90576A326	0000

M24 × 2 mm	36 mm	24 mm	Class 8	185	DIN 985, ISO 10511	1	90576A304	0000
M24 × 3 mm	36 mm	24 mm	Class 8	185	DIN 985, ISO 10511	5	90576A129	00000
M27 × 1.5 mm	41 mm	27 mm	Class 8	185	DIN 985, ISO 10511	1	90576A352	0000
M27 × 2 mm	41 mm	27 mm	Class 8	185	DIN 985, ISO 10511	1	90576A342	0000
M27 × 3 mm	41 mm	27 mm	Class 8	185	DIN 985, ISO 10511	1	90576A140	0000
M30 × 2 mm	46 mm	30 mm	Class 8	185	DIN 985, ISO 10511	1	90576A366	00000
M30 × 3.5 mm	46 mm	30 mm	Class 8	185	DIN 985, ISO 10511	1	90576A150	0000
M33 × 2 mm	50 mm	33 mm	Class 8	185	DIN 985, ISO 10511	1	90576A384	00000
M33 × 3.5 mm	50 mm	33 mm	Class 8	185	DIN 985, ISO 10511	1	90576A163	00000
M36 × 3 mm	55 mm	36 mm	Class 8	185	DIN 985, ISO 10511	1	90576A452	00000
M36 × 4 mm	55 mm	36 mm	Class 8	185	DIN 985, ISO 10511	1	90576A164	00000
M39 × 3 mm	60 mm	39 mm	Class 8	185	DIN 985, ISO 10511	1	90576A523	00000
M42 × 3 mm	65 mm	42 mm	Class 8	185	DIN 985, ISO 10511	1	90576A531	00000
M45 × 3 mm	70 mm	45 mm	Class 8	185	DIN 985, ISO 10511	1	90576A544	00000
M48 × 3 mm	75 mm	48 mm	Class 8	185	DIN 985, ISO 10511	1	90576A726	00000
M48 × 5 mm	75 mm	48 mm	Class 8	185	DIN 985, ISO 10511	1	90576A166	00000

Black-Oxide Steel



		1/4"-20	7/16"	5/16"	SAE Grade 5	185	—	100	95615A101	0000


		1/4"-28	7/16"	5/16"	SAE Grade 5	185	—	100	95615A102	00000
		5/16"-18	1/2"	11/32"	SAE Grade 5	185	—	100	95615A103	00000
		5/16"-24	1/2"	11/32"	SAE Grade 5	185	—	100	95615A104	00000
		3/8"-16	9/16"	29/64"	SAE Grade 5	185	—	100	95615A105	00000
		3/8"-24	9/16"	29/64"	SAE Grade 5	185	—	100	95615A106	00000
		7/16"-14	5/8"	29/64"	SAE Grade 5	185	—	100	95615A107	00000
		7/16"-20	5/8"	29/64"	SAE Grade 5	185	—	100	95615A108	00000
		1/2"-13	3/4"	19/32"	SAE Grade 5	185	—	50	95615A109	00000
		1/2"-20	3/4"	19/32"	SAE Grade 5	185	—	50	95615A111	00000
		9/16"-12	7/8"	41/64"	SAE Grade 5	185	—	25	95615A116	00000


		5/8"-11	15/16"	3/4"	SAE Grade 5	185	—	25	95615A112	00000
		5/8"-18	15/16"	3/4"	SAE Grade 5	185	—	25	95615A113	00000
		3/4"-10	1 1/16"	7/8"	SAE Grade 5	185	—	10	95615A114	00000
		3/4"-16	1 1/16"	7/8"	SAE Grade 5	185	—	10	95615A115	00000
		7/8"-9	1 1/4"	63/64"	SAE Grade 5	185	—	5	95615A117	00000
		1"-8	1 7/16"	1 3/64"	SAE Grade 5	185	—	5	95615A118	00000


		Black-Corrosion-Resistant-Coated Steel



				M4 × 0.7 mm	7 mm	5 mm	Class 8	185	DIN 985, ISO 10511	5	90819A111	00000


				M5 × 0.8 mm	8 mm	5 mm	Class 8	185	DIN 985, ISO 10511	5	90819A112	00000
				M6 × 1 mm	10 mm	6 mm	Class 8	185	DIN 985, ISO 10511	5	90819A113	00000
				M8 × 1.25 mm	13 mm	8 mm	Class 8	185	DIN 985, ISO 10511	5	90819A114	00000
				M10 × 1.5 mm	17 mm	10 mm	Class 8	185	DIN 985, ISO 10511	5	90819A115	00000
				M12 × 1.75 mm	19 mm	12 mm	Class 8	185	DIN 985, ISO 10511	1	90819A116	0000
				M14 × 2 mm	22 mm	14 mm	Class 8	185	DIN 985, ISO 10511	1	90819A117	0000

Low-Strength Steel

Rated Grade 2, Class 6, or lower, these locknuts are about half as strong as medium-strength steel nuts. Use them with screws that have a similar strength rating to avoid stripping threads during installation.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

	Thread Size	Wd.	Ht.	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
Zinc-Plated Steel



		2-56	1/4"	9/64"	185	100	90631A003	00000


		3-48	1/4"	9/64"	185	100	90631A004	0000
		4-40	1/4"	9/64"	185	100	90631A005	0000
		5-40	1/4"	9/64"	185	100	90631A006	0000
		6-32	5/16"	11/64"	185	100	90631A007	0000
		8-32	11/32"	15/64"	185	100	90631A009	0000
		10-24	3/8"	15/64"	185	100	90631A011	0000
		10-32	3/8"	15/64"	185	100	90631A411	0000
		12-24	7/16"	5/16"	185	100	90631A120	0000
		1/4"-20	7/16"	5/16"	185	100	90640A129	0000
		1/4"-28	7/16"	5/16"	185	100	90640A140	0000


		5/16"-18	1/2"	11/32"	185	100	90640A130	0000
		5/16"-24	1/2"	11/32"	185	100	90640A145	0000
		3/8"-16	9/16"	29/64"	185	100	90640A131	00000
		3/8"-24	9/16"	29/64"	185	100	90640A150	00000
		7/16"-14	5/8"	29/64"	185	100	90640A132	00000
		7/16"-20	5/8"	29/64"	185	100	90640A155	00000
		1/2"-13	3/4"	19/32"	185	50	90640A133	00000
		1/2"-20	3/4"	19/32"	185	50	90640A160	00000
		9/16"-12	7/8"	41/64"	185	25	90640A134	0000
		9/16"-18	7/8"	41/64"	185	25	90640A165	00000


		5/8"-11	15/16"	3/4"	185	25	90640A135	00000
		5/8"-18	15/16"	3/4"	185	25	90640A170	00000
		3/4"-10	1 1/16"	7/8"	185	10	90640A320	0000
		3/4"-16	1 1/16"	7/8"	185	10	90640A330	0000
		7/8"-9	1 1/4"	63/64"	185	5	90640A340	0000
		7/8"-14	1 1/4"	63/64"	185	5	90640A350	0000
		1"-8	1 7/16"	1 3/64"	185	5	90640A360	00000
		1"-14	1 7/16"	1 3/64"	185	5	90640A370	00000
		1 1/8"-7	1 5/8"	1 11/64"	185	1	90640A400	0000
		1 1/4"-7	1 13/16"	1 25/64"	185	1	90640A410	0000


		M4 × 0.7 mm	7 mm	5 mm	185	100	90631A112	0000
		M5 × 0.8 mm	8 mm	5 mm	185	100	90631A113	0000
		M6 × 1 mm	10 mm	6 mm	185	100	90631A114	0000
		M8 × 1.25 mm	13 mm	8 mm	185	100	90631A115	00000
		M10 × 1.5 mm	17 mm	10 mm	185	50	90631A116	00000
		M12 × 1.75 mm	19 mm	12 mm	185	50	90631A117	00000
		M14 × 2 mm	22 mm	14 mm	185	25	90631A118	00000
		M16 × 2 mm	24 mm	16 mm	185	25	90631A119	00000
		M18 × 2.5 mm	27 mm	18.5 mm	185	10	90631A121	00000
		M20 × 2.5 mm	30 mm	22 mm	185	10	90631A122	00000


		M22 × 2.5 mm	32 mm	22 mm	185	10	90631A123	00000
		M24 × 3 mm	36 mm	24 mm	185	5	90631A124	00000
		M27 × 3 mm	41 mm	27 mm	185	1	90631A125	0000
		M30 × 3.5 mm	46 mm	30 mm	185	1	90631A126	0000


		Black-Corrosion-Resistant-Coated Steel



6-32				5/16"	11/64"	185	5	91333A110	0000


8-32	11/32"			15/64"	185	5	91333A120	0000
10-24	3/8"			15/64"	185	5	91333A130	0000
10-32	3/8"			15/64"	185	5	91333A140	0000
1/4"-20	7/16"			5/16"	185	5	91333A150	0000
5/16"-18	1/2"			11/32"	185	5	91333A160	0000
3/8"-16	9/16"			29/64"	185	5	91333A170	0000
1/2"-13	3/4"			19/32"	185	5	91333A180	00000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

Black-Oxide 18-8 Stainless Steel—Typically chosen for their appearance, these nuts have a dark, matte coating to create a finished look. They resist rust in wet and outdoor environments, but won't hold up to the harsh chemicals that 316 stainless steel can.

316 Stainless Steel—Our most corrosion-resistant nuts, these hold up in just about any environment. They won't degrade from exposure to weather, salt water, and most chemicals.

	Thread Size	Wd.	Ht.	Insert Max. Temp., ° F	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel



		0-80	7/64"	1/16"	185	—	10	91831A171	000000


		2-56	1/4"	9/64"	185	—	50	91831A002	0000
		3-48	1/4"	9/64"	185	—	25	91831A004	0000
		3-56	1/4"	9/64"	185	—	25	91831A172	0000
		4-40	1/4"	9/64"	185	—	100	91831A005	0000
		4-48	1/4"	9/64"	185	—	25	91831A173	0000
		5-40	1/4"	9/64"	185	—	100	91831A006	0000
		6-32	5/16"	11/64"	185	—	100	91831A007	0000
		6-40	5/16"	11/64"	185	—	100	91831A122	0000
		8-32	11/32"	15/64"	185	—	100	91831A009	0000
		8-36	11/32"	15/64"	185	—	100	91831A123	00000


		10-24	3/8"	15/64"	185	—	100	91831A011	0000
		10-32	3/8"	15/64"	185	—	100	91831A411	0000
		12-24	7/16"	5/16"	185	—	50	91831A025	0000
		12-28	7/16"	5/16"	185	—	50	91831A124	00000
		1/4"-20	7/16"	5/16"	185	—	50	91831A029	0000
		1/4"-28	7/16"	5/16"	185	—	50	91831A120	0000
		5/16"-18	1/2"	11/32"	185	—	50	91831A030	00000
		5/16"-24	1/2"	11/32"	185	—	50	91831A125	0000
		3/8"-16	9/16"	29/64"	185	—	25	91831A127	0000
		3/8"-24	9/16"	29/64"	185	—	25	91831A130	0000


		7/16"-14	5/8"	29/64"	185	—	25	91831A133	0000
		7/16"-20	5/8"	29/64"	185	—	25	91831A135	00000
		1/2"-13	3/4"	19/32"	185	—	10	91831A137	0000
		1/2"-20	3/4"	19/32"	185	—	10	91831A140	0000
		9/16"-12	7/8"	41/64"	185	—	1	91831A034	0000
		9/16"-18	7/8"	41/64"	185	—	1	91831A143	0000
		5/8"-11	15/16"	3/4"	185	—	5	91831A144	0000
		5/8"-18	15/16"	3/4"	185	—	5	91831A145	0000
		3/4"-10	1 1/16"	7/8"	185	—	5	91831A147	00000
		3/4"-16	1 1/16"	7/8"	185	—	1	91831A150	0000


		7/8"-9	1 1/4"	63/64"	185	—	1	91831A037	0000
		7/8"-14	1 1/4"	63/64"	185	—	1	91831A155	0000
		1"-8	1 7/16"	1 3/64"	185	—	1	91831A038	0000
		1"-12	1 7/16"	1 3/64"	185	—	1	91831A121	00000
		1"-14	1 7/16"	1 3/64"	185	—	1	91831A160	0000
		1 1/8"-7	1 5/8"	1 11/64"	185	—	1	91831A039	00000
		1 1/4"-7	1 13/16"	1 25/64"	185	—	1	91831A040	00000
		1 3/8"-6	2"	1 37/64"	185	—	1	91831A174	00000
		1 1/2"-6	2 13/64"	1 39/64"	185	—	1	91831A041	00000
		M2 × 0.4 mm	4 mm	2.8 mm	185	DIN 985	10	93625A101	00000


		M2.5 × 0.45 mm	5 mm	3.8 mm	185	DIN 985	25	93625A103	0000
		M3 × 0.5 mm	5.5 mm	4 mm	185	DIN 985	100	93625A100	0000
		M4 × 0.7 mm	7 mm	5 mm	185	DIN 985	100	93625A150	0000
		M5 × 0.8 mm	8 mm	5 mm	185	DIN 985	100	93625A200	0000
		M6 × 1 mm	10 mm	6 mm	185	DIN 985	100	93625A250	00000
		M8 × 1 mm	13 mm	8 mm	185	DIN 985	5	93625A110	00000
		M8 × 1.25 mm	13 mm	8 mm	185	DIN 985	50	93625A300	00000
		M10 × 1 mm	17 mm	10 mm	185	DIN 985	5	93625A120	00000
		M10 × 1.5 mm	17 mm	10 mm	185	DIN 985	10	93625A350	0000
		M12 × 1.5 mm	19 mm	12 mm	185	DIN 985	1	93625A130	0000

M12 × 1.75 mm	19 mm	12 mm	185	DIN 985	10	93625A400	0000
M14 × 1.5 mm	22 mm	14 mm	185	DIN 985	1	93625A140	0000
M14 × 2 mm	22 mm	14 mm	185	DIN 985	5	93625A450	0000
M16 × 1.5 mm	24 mm	16 mm	185	DIN 985	1	93625A160	00000
M16 × 2 mm	24 mm	16 mm	185	DIN 985	5	93625A500	0000
M18 × 1.5 mm	27 mm	18 mm	185	DIN 985	1	93625A170	00000
M18 × 2.5 mm	27 mm	18.5 mm	185	DIN 985	1	93625A510	0000
M20 × 1.5 mm	30 mm	20 mm	185	DIN 985	1	93625A180	00000
M20 × 2.5 mm	30 mm	20 mm	185	DIN 985	1	93625A550	0000
M22 × 2.5 mm	32 mm	22 mm	185	DIN 985	1	93625A760	0000
M24 × 3 mm	36 mm	24 mm	185	DIN 985	1	93625A600	0000
M27 × 3 mm	41 mm	27 mm	185	DIN 985	1	93625A700	00000
M30 × 3.5 mm	46 mm	30 mm	185	DIN 985	1	93625A750	00000

Black-Oxide 18-8 Stainless Steel



		2-56	1/4"	9/64"	185	—	50	94407A108	00000


		3-48	1/4"	9/64"	185	—	25	94407A109	00000
		4-40	1/4"	9/64"	185	—	100	94407A100	00000
		5-40	1/4"	9/64"	185	—	25	94407A110	0000
		6-32	5/16"	11/64"	185	—	100	94407A101	00000
		6-40	5/16"	11/64"	185	—	25	94407A111	00000
		8-32	11/32"	15/64"	185	—	100	94407A102	00000
		8-36	11/32"	15/64"	185	—	25	94407A112	00000
		10-24	3/8"	15/64"	185	—	100	94407A103	00000
		10-32	3/8"	15/64"	185	—	25	94407A113	0000
		12-24	7/16"	5/16"	185	—	25	94407A114	00000


		1/4"-20	7/16"	5/16"	185	—	50	94407A104	00000
		1/4"-28	7/16"	5/16"	185	—	10	94407A116	0000
		5/16"-18	1/2"	11/32"	185	—	50	94407A105	00000
		5/16"-24	1/2"	11/32"	185	—	10	94407A117	00000
		3/8"-16	9/16"	29/64"	185	—	25	94407A106	00000
		3/8"-24	9/16"	29/64"	185	—	10	94407A118	00000
		7/16"-14	5/8"	29/64"	185	—	10	94407A119	00000
		7/16"-20	5/8"	29/64"	185	—	5	94407A120	00000
		1/2"-13	3/4"	19/32"	185	—	10	94407A107	00000
		1/2"-20	3/4"	19/32"	185	—	5	94407A121	00000


		5/8"-11	15/16"	3/4"	185	—	1	94407A124	0000
		3/4"-10	1 1/16"	7/8"	185	—	1	94407A125	0000
		M2 × 0.4 mm	4 mm	3 mm	185	DIN 985	5	93625A221	0000
		M2.5 × 0.45 mm	5 mm	3.8 mm	185	DIN 985	10	93625A222	0000
		M3 × 0.5 mm	5.5 mm	4 mm	185	DIN 985	10	93625A223	0000
		M4 × 0.7 mm	7 mm	5 mm	185	DIN 985	10	93625A224	0000
		M5 × 0.8 mm	8 mm	5 mm	185	DIN 985	10	93625A225	0000
		M6 × 1 mm	10 mm	6 mm	185	DIN 985	10	93625A226	0000
		M8 × 1.25 mm	13 mm	8 mm	185	DIN 985	10	93625A227	0000
		M10 × 1.5 mm	17 mm	10 mm	185	DIN 985	10	93625A228	00000


		M12 × 1.75 mm	19 mm	12 mm	185	DIN 985	5	93625A229	0000


		316 Stainless Steel



				4-40	1/4"	9/64"	185	—	100	90715A005	0000


				5-40	1/4"	9/64"	185	—	50	90715A006	0000
				6-32	5/16"	11/64"	185	—	100	90715A007	0000
				8-32	11/32"	15/64"	185	—	100	90715A009	00000
				10-24	3/8"	15/64"	185	—	100	90715A011	00000
				10-32	3/8"	15/64"	185	—	50	90715A115	0000
				12-24	7/16"	5/16"	185	—	50	90715A222	00000
				1/4"-20	7/16"	5/16"	185	—	50	90715A125	0000
				1/4"-28	7/16"	5/16"	185	—	50	90715A130	0000
				5/16"-18	1/2"	11/32"	185	—	50	90715A135	00000
				5/16"-24	1/2"	11/32"	185	—	25	90715A140	0000


3/8"-16				9/16"	29/64"	185	—	25	90715A145	0000
3/8"-24	9/16"			29/64"	185	—	25	90715A148	00000
7/16"-14	5/8"			29/64"	185	—	10	90715A032	0000
7/16"-20	5/8"			29/64"	185	—	10	90715A034	0000
1/2"-13	3/4"			19/32"	185	—	10	90715A165	0000
1/2"-20	3/4"			19/32"	185	—	10	90715A170	00000
9/16"-12	7/8"			41/64"	185	—	1	90715A173	0000
9/16"-18	7/8"			41/64"	185	—	1	90715A223	0000
5/8"-11	15/16"			3/4"	185	—	5	90715A185	0000
5/8"-18	15/16"			3/4"	185	—	1	90715A187	0000


3/4"-10	1 1/16"			7/8"	185	—	1	90715A036	0000
3/4"-16	1 1/16"			7/8"	185	—	1	90715A038	0000
7/8"-9	1 1/4"			63/64"	185	—	1	90715A045	0000
7/8"-14	1 1/4"			63/64"	185	—	1	90715A122	00000
1"-8	1 7/16"			1 3/64"	185	—	1	90715A055	0000
1"-12	1 7/16"			1 3/64"	185	—	1	90715A224	00000
1"-14	1 7/16"			1 3/64"	185	—	1	90715A123	00000
1 1/8"-7	1 5/8"			1 11/64"	185	—	1	90715A210	00000
1 1/4"-7	1 13/16"			1 25/64"	185	—	1	90715A215	00000
1 1/2"-6	2 13/64"			1 39/64"	185	—	1	90715A220	00000


M2.5 × 0.45 mm	5 mm			3.8 mm	185	DIN 985	50	94205A101	00000
M3 × 0.5 mm	5.5 mm			4 mm	185	DIN 985	50	94205A220	0000
M4 × 0.7 mm	7 mm			5 mm	185	DIN 985	50	94205A230	0000
M5 × 0.8 mm	8 mm			5 mm	185	DIN 985	50	94205A240	0000
M6 × 1 mm	10 mm			6 mm	185	DIN 985	50	94205A250	00000
M8 × 1.25 mm	13 mm			8 mm	185	DIN 985	25	94205A260	0000
M10 × 1.5 mm	17 mm			10 mm	185	DIN 985	10	94205A270	00000
M12 × 1.75 mm	19 mm			12 mm	185	DIN 985	10	94205A280	00000
M14 × 2 mm	22 mm			14 mm	185	DIN 985	1	94205A290	0000
M16 × 2 mm	24 mm			16 mm	185	DIN 985	5	94205A310	00000


M18 × 2.5 mm	27 mm			18.5 mm	185	DIN 985	1	94205A315	00000
M20 × 2.5 mm	30 mm			20 mm	185	DIN 985	1	94205A320	0000
M22 × 2.5 mm	32 mm			22 mm	185	DIN 985	1	94205A111	0000
M24 × 3 mm	36 mm			24 mm	185	DIN 985	1	94205A330	00000
M27 × 3 mm	41 mm			27 mm	185	DIN 985	1	94205A350	00000
M30 × 3.5 mm	46 mm			30 mm	185	DIN 985	1	94205A380	00000

High-Strength Lightweight Titanium

Grade 5 Titanium—The best of both worlds, these locknuts are lightweight like aluminum and as corrosion-resistant as 316 stainless steel. They're ideal for use in chemical-processing and water-treatment facilities since they stand up to strong acids and other harsh chemicals. Grade 5 is the strongest of all the titanium alloys due to its higher aluminum and vanadium content.

	Wd.	Ht.	Insert Max. Temp.	Pkg. Qty.		Pkg.
Grade 5 Titanium



	4-40	1/4"	9/64"	Not Rated	1	94528A112	00000


	6-32	5/16"	11/64"	Not Rated	1	94528A113	0000
	8-32	11/32"	15/64"	Not Rated	1	94528A114	0000
	10-24	3/8"	15/64"	Not Rated	1	94528A115	00000
	10-32	3/8"	15/64"	Not Rated	1	94528A116	00000
	1/4"-20	7/16"	5/16"	Not Rated	1	94528A117	0000
	5/16"-18	1/2"	11/32"	Not Rated	1	94528A118	0000
	3/8"-16	9/16"	29/64"	Not Rated	1	94528A119	00000
	1/2"-13	3/4"	19/32"	Not Rated	1	94528A121	00000

Lightweight Aluminum

6061 Aluminum—One-third the weight of steel, these nuts are commonly used in robotics, automation, and other applications that have weight limitations. They're an alternative to stainless steel for rust resistance but are not as strong.

	Wd.	Ht.	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
6061 Aluminum



	8-32	11/32"	15/64"	185	25	95856A215	00000


	10-24	3/8"	15/64"	185	25	95856A225	0000
	10-32	3/8"	15/64"	185	25	95856A235	0000
	1/4"-20	7/16"	5/16"	185	25	95856A245	0000
	5/16"-18	1/2"	11/32"	185	25	95856A255	0000
	3/8"-16	9/16"	29/64"	185	10	95856A265	0000
	1/2"-13	3/4"	19/32"	185	5	95856A275	0000

Brass

Brass—Conductive and nonmagnetic, brass locknuts are typically used to secure electrical equipment, such as circuit board assemblies and mounting brackets inside enclosures. They're also softer than most metals, so they won't damage other fastening components.

	Wd.	Ht.	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
Brass



	4-40	1/4"	9/64"	185	50	92092A101	000000


	6-32	5/16"	11/64"	185	25	92092A021	0000
	8-32	11/32"	15/64"	185	25	92092A023	0000
	10-24	3/8"	15/64"	185	25	92092A025	0000
	10-32	3/8"	15/64"	185	25	92092A027	0000
	1/4"-20	7/16"	5/16"	185	10	92092A029	0000
	5/16"-18	1/2"	11/32"	185	10	92092A030	00000
	3/8"-16	9/16"	29/64"	185	5	92092A031	0000
	1/2"-13	3/4"	19/32"	185	1	92092A033	0000
	5/8"-11	15/16"	3/4"	185	1	92092A035	00000
	3/4"-10	1 1/16"	7/8"	185	1	92092A036	00000

Thin-Profile Nylon-Insert Locknuts

About half the height of standard-profile locknuts, these fit in spaces with low clearance. You can also use them as jam nuts by threading them against a hex nut to hold it in place. The nylon insert grips the screw to prevent loosening from moderate vibration without damaging threads. However, the insert may become brittle if exposed to high temperatures. These locknuts are reusable a handful of times, but the holding power decreases with each use.

High-Strength Steel

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

	Wd.	Ht.	Fastener Strength Grade/Class	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
Zinc-Yellow-Chromate-Plated Steel



	1/4"-20	7/16"	13/64"	SAE Grade 8	Not Rated	100	94945A205	000000


	1/4"-28	7/16"	13/64"	SAE Grade 8	250	10	94945A139	0000
	5/16"-18	1/2"	1/4"	SAE Grade 8	Not Rated	100	94945A213	00000
	5/16"-24	1/2"	1/4"	SAE Grade 8	250	10	94945A119	00000
	3/8"-16	9/16"	17/64"	SAE Grade 8	Not Rated	100	94945A217	00000
	3/8"-24	9/16"	17/64"	SAE Grade 8	Not Rated	50	94945A218	00000
	7/16"-14	5/8"	5/16"	SAE Grade 8	Not Rated	25	94945A260	00000
	7/16"-20	5/8"	5/16"	SAE Grade 8	Not Rated	25	94945A270	00000
	1/2"-13	3/4"	5/16"	SAE Grade 8	Not Rated	25	94945A224	00000
	1/2"-20	3/4"	5/16"	SAE Grade 8	250	5	94945A121	0000
	5/8"-11	15/16"	25/64"	SAE Grade 8	Not Rated	10	94945A227	0000


	5/8"-18	15/16"	25/64"	SAE Grade 8	250	5	94945A122	0000
	3/4"-16	1 1/16"	13/32"	SAE Grade 8	250	1	94945A123	0000
	7/8"-14	1 1/4"	15/32"	SAE Grade 8	250	1	94945A124	0000
	1"-14	1 7/16"	35/64"	SAE Grade 8	250	1	94945A125	0000
	1 1/4"-12	1 13/16"	3/4"	SAE Grade 8	Not Rated	1	94945A280	00000
	1 1/2"-12	2 3/16"	51/64"	SAE Grade 8	Not Rated	1	94945A290	00000


	Zinc-Plated Steel



			5/16"-24	1/2"	1/4"	SAE Grade 8	220	10	94945A215	0000


			1/2"-20	3/4"	5/16"	SAE Grade 8	220	5	94945A225	0000
			5/8"-18	15/16"	25/64"	SAE Grade 8	220	5	94945A230	0000
			3/4"-16	1 1/16"	13/32"	SAE Grade 8	220	1	94945A235	0000
			7/8"-14	1 1/4"	15/32"	SAE Grade 8	220	1	94945A240	0000
			1"-14	1 7/16"	35/64"	SAE Grade 8	220	1	94945A250	0000
			1 1/8"-12	1 53/64"	41/64"	SAE Grade 8	220	1	94945A251	00000


			Black-Oxide Steel



					1/4"-20	7/16"	13/64"	SAE Grade 8	250	25	94945A131	00000


					1/4"-28	7/16"	13/64"	SAE Grade 8	250	10	94945A132	00000
					5/16"-18	1/2"	1/4"	SAE Grade 8	250	25	94945A133	00000
					5/16"-24	1/2"	1/4"	SAE Grade 8	250	10	94945A111	00000
					3/8"-16	9/16"	17/64"	SAE Grade 8	250	10	94945A134	0000
					3/8"-24	9/16"	17/64"	SAE Grade 8	250	10	94945A135	0000
					7/16"-20	5/8"	5/16"	SAE Grade 8	250	10	94945A136	00000
					1/2"-13	3/4"	5/16"	SAE Grade 8	250	10	94945A137	00000
					1/2"-20	3/4"	5/16"	SAE Grade 8	250	5	94945A112	0000
					5/8"-11	15/16"	25/64"	SAE Grade 8	250	5	94945A138	00000
					5/8"-18	15/16"	25/64"	SAE Grade 8	250	5	94945A113	00000


					3/4"-16	1 1/16"	13/32"	SAE Grade 8	250	1	94945A114	0000
					7/8"-14	1 1/4"	15/32"	SAE Grade 8	250	1	94945A115	0000
					1"-14	1 7/16"	35/64"	SAE Grade 8	250	1	94945A116	0000
					1 1/4"-12	1 13/16"	47/64"	SAE Grade 8	250	1	94945A118	00000
1 1/2"-12					2 11/64"	51/64"	SAE Grade 8	250	1	94945A117	00000

Medium-Strength Steel

These Grade 5 or Class 8 nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

	Wd.	Ht.	Fastener Strength Grade/Class	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	5/8"-11	15/16"	25/64"	SAE Grade 5	220	5	91342A210	000000


	5/8"-18	15/16"	25/64"	SAE Grade 5	220	5	91342A220	00000
	3/4"-10	1 1/16"	13/32"	SAE Grade 5	220	5	91342A230	00000
	3/4"-16	1 1/16"	13/32"	SAE Grade 5	220	10	91342A240	00000
	7/8"-14	1 1/4"	15/32"	SAE Grade 5	220	1	91342A250	0000
	1"-8	1 7/16"	35/64"	SAE Grade 5	220	1	91342A260	0000
	1"-14	1 7/16"	35/64"	SAE Grade 5	220	1	91342A270	0000
	1 1/8"-7	1 5/8"	41/64"	SAE Grade 5	220	1	91342A280	00000
	1 1/4"-7	1 13/16"	3/4"	SAE Grade 5	220	1	91342A290	00000
	1 1/4"-12	1 13/16"	3/4"	SAE Grade 5	220	1	91342A320	00000
	1 1/2"-6	2 3/16"	51/64"	SAE Grade 5	220	1	91342A310	00000

Low-Strength Steel

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

Black-Zinc-Plated Steel—The dark zinc plating withstands occasional exposure to moisture while creating a finished look.

	Thread Size	Wd.	Ht.	Insert Max. Temp., ° F	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel



		2-56	1/4"	7/64"	220	—	100	90633A004	000000


		4-40	1/4"	7/64"	220	—	100	90633A005	0000
		5-40	1/4"	7/64"	220	—	100	90633A006	0000
		6-32	5/16"	1/8"	220	—	100	90633A007	00000
		8-32	11/32"	11/64"	220	—	100	90633A009	0000
		10-24	3/8"	11/64"	220	—	100	90633A011	0000
		10-32	3/8"	11/64"	220	—	100	90633A411	0000
		12-24	7/16"	13/64"	220	—	100	90633A412	0000
		1/4"-20	7/16"	13/64"	220	—	100	90566A029	0000
		1/4"-28	7/16"	13/64"	220	—	100	90566A210	0000
		5/16"-18	1/2"	1/4"	220	—	100	90566A030	0000


		5/16"-24	1/2"	1/4"	220	—	100	90566A215	0000
		3/8"-16	9/16"	17/64"	220	—	100	90566A031	0000
		3/8"-24	9/16"	17/64"	220	—	100	90566A220	0000
		7/16"-14	5/8"	5/16"	220	—	100	90566A032	00000
		7/16"-20	5/8"	5/16"	220	—	100	90566A225	00000
		1/2"-13	3/4"	5/16"	220	—	100	90566A033	00000
		1/2"-20	3/4"	5/16"	220	—	100	90566A230	00000
		9/16"-12	7/8"	23/64"	220	—	100	90566A231	00000
		9/16"-18	7/8"	23/64"	220	—	100	90566A232	00000
		5/8"-11	15/16"	25/64"	220	—	50	90566A035	00000


		5/8"-18	15/16"	25/64"	220	—	50	90566A235	00000
		3/4"-10	1 1/16"	13/32"	220	—	10	90566A240	0000
		3/4"-16	1 1/16"	13/32"	220	—	10	90566A243	0000
		7/8"-9	1 1/4"	15/32"	220	—	5	90566A246	0000
		7/8"-14	1 1/4"	15/32"	220	—	5	90566A249	0000
		1"-8	1 7/16"	35/64"	220	—	1	90566A253	0000
		1"-14	1 7/16"	35/64"	220	—	1	90566A256	0000
		1 1/8"-7	1 5/8"	41/64"	220	—	1	90566A259	0000
		1 1/4"-7	1 13/16"	3/4"	220	—	1	90566A262	0000
		1 1/4"-12	1 13/16"	3/4"	220	—	1	90566A265	0000


		1 3/8"-6	2"	51/64"	220	—	1	90566A268	0000
		1 1/2"-6	2 3/16"	51/64"	220	—	1	90566A271	0000
		M3 × 0.5 mm	5.5 mm	3.9 mm	245	ISO 10511	25	90453A111	00000
		M4 × 0.7 mm	7 mm	5 mm	245	ISO 10511	25	90453A112	0000
		M5 × 0.8 mm	8 mm	5 mm	245	ISO 10511	25	90453A113	0000
		M6 × 1 mm	10 mm	6 mm	245	ISO 10511	10	90453A114	0000
		M8 × 1.25 mm	13 mm	6.8 mm	245	ISO 10511	5	90453A115	0000
		M10 × 1.5 mm	16 mm	8.6 mm	245	ISO 10511	5	90453A116	0000
		M12 × 1.75 mm	18 mm	10.3 mm	245	ISO 10511	5	90453A117	0000
		M14 × 2 mm	21 mm	11.4 mm	245	ISO 10511	5	90453A118	0000


		M16 × 2 mm	24 mm	12.5 mm	245	ISO 10511	1	90453A119	0000
		M18 × 2.5 mm	26 mm	13 mm	245	ISO 10511	1	90453A121	0000
		M20 × 2.5 mm	30 mm	14.9 mm	245	ISO 10511	1	90453A122	0000
		M24 × 3 mm	36 mm	17.8 mm	245	ISO 10511	1	90453A123	00000


		Black-Zinc-Plated Steel



6-32				5/16"	1/8"	220	—	25	94627A110	0000


8-32	11/32"			11/64"	220	—	25	94627A120	0000
10-24	3/8"			11/64"	220	—	25	94627A130	0000
10-32	3/8"			11/64"	220	—	25	94627A140	0000
12-24	7/16"			13/64"	220	—	25	94627A150	0000
1/4"-20	7/16"			13/64"	220	—	25	94627A160	0000
5/16"-18	1/2"			1/4"	220	—	10	94627A170	0000
3/8"-16	9/16"			17/64"	220	—	10	94627A180	0000


Black-Corrosion-Resistant-Coated Steel



				6-32	5/16"	1/8"	220	—	5	91581A315	0000


				8-32	11/32"	11/64"	220	—	5	91581A325	0000
				10-24	3/8"	11/64"	220	—	5	91581A335	0000
				10-32	3/8"	11/64"	220	—	5	91581A345	0000
				1/4"-20	7/16"	13/64"	220	—	5	91581A355	0000
				5/16"-18	1/2"	1/4"	220	—	5	91581A365	0000
				3/8"-16	9/16"	17/64"	220	—	5	91581A375	0000
				1/2"-13	3/4"	5/16"	220	—	5	91581A385	0000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

316 Stainless Steel—Our most corrosion-resistant nuts, these hold up in just about any environment. They won't degrade from exposure to weather, salt water, and most chemicals.

	Thread Size	Wd.	Ht.	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
18-8 Stainless Steel



		4-40	1/4"	7/64"	220	50	90101A004	00000


		6-32	5/16"	1/8"	220	100	90101A007	00000
		8-32	11/32"	11/64"	220	100	90101A009	0000
		10-24	3/8"	11/64"	220	100	90101A011	00000
		10-32	3/8"	11/64"	220	50	90101A225	0000
		1/4"-20	7/16"	13/64"	220	50	90101A230	0000
		1/4"-28	7/16"	13/64"	220	50	90101A235	0000
		5/16"-18	1/2"	1/4"	220	50	90101A237	0000
		5/16"-24	1/2"	1/4"	220	50	90101A240	0000
		3/8"-16	9/16"	17/64"	220	25	90101A243	0000
		3/8"-24	9/16"	17/64"	220	25	90101A245	0000


		7/16"-14	5/8"	5/16"	220	10	90101A247	0000
		7/16"-20	5/8"	5/16"	220	5	90101A250	0000
		1/2"-13	3/4"	5/16"	220	10	90101A252	0000
		1/2"-20	3/4"	5/16"	220	5	90101A255	0000
		9/16"-18	7/8"	23/64"	220	1	90101A251	00000
		5/8"-11	15/16"	25/64"	220	1	90101A038	0000
		5/8"-18	15/16"	25/64"	220	1	90101A260	0000
		3/4"-10	1 1/16"	13/32"	220	1	90101A050	0000
		3/4"-16	1 1/16"	13/32"	220	1	90101A055	00000
		7/8"-9	1 1/4"	15/32"	220	1	90101A060	0000


		7/8"-14	1 1/4"	15/32"	220	1	90101A065	00000
		1"-8	1 7/16"	35/64"	220	1	90101A070	00000
		1"-14	1 7/16"	35/64"	220	1	90101A075	00000
		1 1/8"-7	1 5/8"	41/64"	220	1	90101A080	00000
		1 1/4"-7	1 13/16"	3/4"	220	1	90101A090	00000
		1 1/4"-12	1 13/16"	3/4"	220	1	90101A095	00000
		1 1/2"-6	2 3/16"	51/64"	220	1	90101A150	00000


		Black-Oxide 18-8 Stainless Steel



				4-40	1/4"	1/8"	220	100	90101A115	00000


				6-32	5/16"	9/64"	220	100	90101A116	00000
				8-32	11/32"	3/16"	220	100	90101A117	00000
				10-24	3/8"	3/16"	220	100	90101A118	00000
				10-32	3/8"	3/16"	220	100	90101A119	00000
				1/4"-20	7/16"	13/64"	220	50	90101A121	00000
				5/16"-18	1/2"	1/4"	220	50	90101A122	00000
				3/8"-16	9/16"	17/64"	220	50	90101A123	00000
				3/8"-24	9/16"	17/64"	220	50	90101A124	00000
				1/2"-13	3/4"	5/16"	220	5	90101A125	0000
				1/2"-20	3/4"	5/16"	220	5	90101A126	0000


				316 Stainless Steel



						10-24	3/8"	11/64"	220	50	97367A111	00000


10-32	3/8"					11/64"	220	50	97367A112	00000
1/4"-20	7/16"					13/64"	220	25	97367A113	0000
1/4"-28	7/16"					13/64"	220	50	97367A132	00000
5/16"-18	1/2"					1/4"	220	25	97367A114	00000
5/16"-24	1/2"					1/4"	220	50	97367A133	00000
3/8"-16	9/16"					17/64"	220	25	97367A115	00000
3/8"-24	9/16"					17/64"	220	25	97367A134	00000
7/16"-14	5/8"					5/16"	220	25	97367A135	00000
7/16"-20	5/8"					5/16"	220	25	97367A136	00000
1/2"-13	3/4"					5/16"	220	10	97367A116	00000


1/2"-20	3/4"					5/16"	220	10	97367A137	00000
3/4"-10	1 1/16"					25/64"	220	1	97367A131	00000

Top-Lock Distorted-Thread Locknuts

Irregularly shaped threads at the top of these locknuts grip the screw for a stronger hold than nylon-insert locknuts. Although the threads prevent the nut from backing out due to vibration, they also increase the effort to install and remove. To get these nuts off, you may need special tools, such as an impact wrench or propane torch. Nuts are not reusable.

Extreme-Strength Steel

About 20% stronger than high-strength steel locknuts, these Grade 9 nuts are the strongest we offer. Make sure to use them with Grade 9 screws to avoid stripped threads during installation.

Cadmium-Plated Steel—These locknuts have good lubricity to thread on smoothly and ease installation. The plating also creates a barrier against rust that's comparable to zinc-yellow-chromate plating.

	Wd.	Ht.	Fastener Strength Grade/Class	Pkg. Qty.		Pkg.
Cadmium-Plated Steel



	1/4"-20	7/16"	19/64"	SAE Grade 9	25	93591A100	000000


	5/16"-18	1/2"	21/64"	SAE Grade 9	25	93591A200	00000
	3/8"-16	9/16"	25/64"	SAE Grade 9	10	93591A300	0000
	7/16"-14	11/16"	29/64"	SAE Grade 9	10	93591A400	00000
	1/2"-13	3/4"	17/32"	SAE Grade 9	5	93591A500	0000
	5/8"-11	15/16"	11/16"	SAE Grade 9	1	93591A600	0000
	3/4"-10	1 1/8"	25/32"	SAE Grade 9	1	93591A700	0000

High-Strength Steel

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

Black-Phosphate-Coated Steel—The dark coating creates both a finished appearance and a barrier against rust that withstands occasional exposure to moisture.

Zinc-Flake-Coated Steel—The most durable zinc coating, this multilayer finish resists wear for long-term rust protection. However, similar to zinc-yellow-chromate plating, it won't hold up to harsh chemicals like stainless steel can.

Steel—Best for dry environments since moisture will cause these nuts to rust.

	Thread Size	Wd.	Ht.	Fastener Strength Grade/Class	Pkg. Qty.		Pkg.
Zinc-Yellow-Chromate-Plated Steel



		1/4"-20	7/16"	7/32"	ASTM Grade C	50	99291A110	00000


		1/4"-28	7/16"	7/32"	ASTM Grade C	50	99291A220	0000
		5/16"-18	1/2"	17/64"	ASTM Grade C	50	99291A120	0000
		5/16"-24	1/2"	17/64"	ASTM Grade C	50	99291A230	0000
		3/8"-16	9/16"	21/64"	ASTM Grade C	25	99291A130	0000
		3/8"-24	9/16"	21/64"	ASTM Grade C	25	99291A240	0000
		7/16"-14	11/16"	3/8"	ASTM Grade C	25	99291A140	0000
		7/16"-20	11/16"	3/8"	ASTM Grade C	25	99291A250	0000
		1/2"-13	3/4"	7/16"	ASTM Grade C	10	99291A150	0000
		1/2"-20	3/4"	7/16"	ASTM Grade C	10	99291A260	0000
		9/16"-12	7/8"	31/64"	ASTM Grade C	10	99291A160	0000


		9/16"-18	7/8"	31/64"	ASTM Grade C	10	99291A270	0000
		5/8"-11	15/16"	35/64"	ASTM Grade C	5	99291A170	0000
		5/8"-18	15/16"	35/64"	ASTM Grade C	5	99291A280	0000
		3/4"-10	1 1/8"	41/64"	ASTM Grade C	5	99291A180	0000
		3/4"-16	1 1/8"	41/64"	ASTM Grade C	5	99291A290	0000
		7/8"-9	1 5/16"	3/4"	ASTM Grade C	1	99291A190	0000
		7/8"-14	1 5/16"	3/4"	ASTM Grade C	1	99291A310	0000
		1"-8	1 1/2"	55/64"	ASTM Grade C	1	99291A210	0000
		1"-14	1 1/2"	55/64"	ASTM Grade C	1	99291A320	0000
		M6 × 1 mm	10 mm	6 mm	Class 10	100	99183A250	00000


		M8 × 1 mm	13 mm	8 mm	Class 10	10	99183A790	0000
		M8 × 1.25 mm	13 mm	8 mm	Class 10	50	99183A260	00000
		M10 × 1.25 mm	17 mm	10 mm	Class 10	10	99183A480	0000
		M10 × 1.5 mm	17 mm	10 mm	Class 10	25	99183A270	00000
		M12 × 1.25 mm	19 mm	12 mm	Class 10	5	99183A490	00000
		M12 × 1.5 mm	19 mm	12 mm	Class 10	5	99183A810	00000
		M12 × 1.75 mm	19 mm	12 mm	Class 10	10	99183A280	0000
		M14 × 1.5 mm	22 mm	14 mm	Class 10	5	99183A820	00000
		M14 × 2 mm	22 mm	14 mm	Class 10	10	99183A290	0000
		M16 × 1.5 mm	24 mm	16 mm	Class 10	1	99183A830	0000


		M16 × 2 mm	24 mm	16 mm	Class 10	10	99183A310	00000
		M18 × 2.5 mm	27 mm	18 mm	Class 10	5	99183A320	00000
		M20 × 2.5 mm	30 mm	20 mm	Class 10	5	99183A330	00000
		M24 × 3 mm	36 mm	24 mm	Class 10	1	99183A340	0000


		Zinc-Plated Steel



				1/4"-20	7/16"	7/32"	ASTM Grade C	100	92501A521	0000


				1/4"-28	7/16"	7/32"	ASTM Grade C	100	92501A522	00000
				5/16"-18	1/2"	17/64"	ASTM Grade C	100	92501A523	00000
				5/16"-24	1/2"	17/64"	ASTM Grade C	100	92501A524	00000
				3/8"-16	9/16"	21/64"	ASTM Grade C	100	92501A525	00000
				3/8"-24	9/16"	21/64"	ASTM Grade C	100	92501A526	00000
				7/16"-14	11/16"	3/8"	ASTM Grade C	50	92501A527	00000
				7/16"-20	11/16"	3/8"	ASTM Grade C	50	92501A528	00000
				1/2"-13	3/4"	7/16"	ASTM Grade C	50	92501A529	00000
				1/2"-20	3/4"	7/16"	ASTM Grade C	50	92501A530	00000
9/16"-12				7/8"	31/64"	ASTM Grade C	25	92501A531	00000


9/16"-18	7/8"			31/64"	ASTM Grade C	25	92501A532	00000
5/8"-11	15/16"			35/64"	ASTM Grade C	25	92501A533	00000
5/8"-18	15/16"			35/64"	ASTM Grade C	25	92501A534	00000
3/4"-10	1 1/8"			41/64"	ASTM Grade C	10	92501A535	0000
3/4"-16	1 1/8"			41/64"	ASTM Grade C	10	92501A536	0000
7/8"-9	1 5/16"			3/4"	ASTM Grade C	10	92501A537	00000
7/8"-14	1 5/16"			3/4"	ASTM Grade C	10	92501A538	00000
1"-8	1 1/2"			55/64"	ASTM Grade C	5	92501A539	00000
1"-14	1 1/2"			55/64"	ASTM Grade C	5	92501A540	00000
1 1/8"-7	1 11/16"			1"	ASTM Grade C	1	92501A541	0000


1 1/8"-12	1 11/16"			1"	ASTM Grade C	1	92501A542	0000
1 1/4"-7	1 7/8"			1 3/32"	ASTM Grade C	1	92501A543	0000
1 1/4"-12	1 7/8"			1 3/32"	ASTM Grade C	1	92501A544	0000
1 1/2"-6	2 1/4"			1 5/16"	ASTM Grade C	1	92501A545	0000
1 1/2"-12	2 1/4"			1 5/16"	ASTM Grade C	1	92501A546	0000
M5 × 0.8 mm	8 mm			5.1 mm	Class 10	100	99183A110	0000
M6 × 1 mm	10 mm			6 mm	Class 10	100	99183A120	00000
M8 × 1 mm	13 mm			8 mm	Class 10	50	99183A360	00000
M8 × 1.25 mm	13 mm			8 mm	Class 10	50	99183A130	00000
M10 × 1 mm	17 mm			10 mm	Class 10	25	99183A370	00000


M10 × 1.25 mm	17 mm			10 mm	Class 10	10	99183A750	00000
M10 × 1.5 mm	17 mm			10 mm	Class 10	25	99183A140	00000
M12 × 1.25 mm	19 mm			12 mm	Class 10	25	99183A380	00000
M12 × 1.5 mm	19 mm			12 mm	Class 10	10	99183A760	00000
M12 × 1.75 mm	19 mm			12 mm	Class 10	25	99183A150	00000
M14 × 1.5 mm	22 mm			14 mm	Class 10	10	99183A390	0000
M14 × 2 mm	22 mm			14 mm	Class 10	10	99183A160	0000
M16 × 1.5 mm	24 mm			16 mm	Class 10	10	99183A410	00000
M16 × 2 mm	24 mm			16 mm	Class 10	10	99183A170	0000
M18 × 1.5 mm	27 mm			18 mm	Class 10	5	99183A420	00000


M18 × 2.5 mm	27 mm			18 mm	Class 10	5	99183A180	0000
M20 × 1.5 mm	30 mm			20 mm	Class 10	5	99183A430	00000
M20 × 2.5 mm	30 mm			20 mm	Class 10	5	99183A190	00000
M22 × 1.5 mm	32 mm			22 mm	Class 10	5	99183A440	00000
M22 × 2.5 mm	32 mm			22 mm	Class 10	5	99183A210	00000
M24 × 1.5 mm	36 mm			24 mm	Class 10	1	99183A450	0000
M24 × 3 mm	36 mm			24 mm	Class 10	1	99183A220	0000
M27 × 3 mm	41 mm			27 mm	Class 10	1	99183A230	0000
M30 × 2 mm	46 mm			30 mm	Class 10	1	99183A460	0000
M30 × 3.5 mm	46 mm			30 mm	Class 10	1	99183A240	0000


Black-Oxide Steel



		1/4"-20	7/16"	7/32"	ASTM Grade C	50	99291A330	00000


		5/16"-18	1/2"	17/64"	ASTM Grade C	50	99291A340	00000
		5/16"-24	1/2"	17/64"	ASTM Grade C	50	99291A450	00000
		3/8"-16	9/16"	21/64"	ASTM Grade C	25	99291A350	00000
		3/8"-24	9/16"	21/64"	ASTM Grade C	25	99291A460	00000
		7/16"-14	11/16"	3/8"	ASTM Grade C	10	99291A360	0000
		7/16"-20	11/16"	3/8"	ASTM Grade C	10	99291A470	0000
		1/2"-13	3/4"	7/16"	ASTM Grade C	10	99291A370	00000
		1/2"-20	3/4"	7/16"	ASTM Grade C	10	99291A480	00000
		9/16"-12	7/8"	31/64"	ASTM Grade C	10	99291A380	00000
		9/16"-18	7/8"	31/64"	ASTM Grade C	10	99291A490	00000


		5/8"-11	15/16"	35/64"	ASTM Grade C	5	99291A390	00000
		5/8"-18	15/16"	35/64"	ASTM Grade C	5	99291A510	00000
		3/4"-10	1 1/8"	41/64"	ASTM Grade C	5	99291A410	00000
		3/4"-16	1 1/8"	41/64"	ASTM Grade C	5	99291A520	00000
		7/8"-9	1 5/16"	3/4"	ASTM Grade C	1	99291A420	0000
		7/8"-14	1 5/16"	3/4"	ASTM Grade C	1	99291A530	0000
		1"-8	1 1/2"	55/64"	ASTM Grade C	1	99291A430	0000


		Black-Phosphate-Coated Steel



				M5 × 0.8 mm	8 mm	5.1 mm	Class 10	50	99183A510	00000


				M6 × 1 mm	10 mm	6 mm	Class 10	25	99183A520	0000
				M8 × 1 mm	13 mm	8 mm	Class 10	10	99183A530	0000
				M8 × 1.25 mm	13 mm	8 mm	Class 10	25	99183A540	00000
				M10 × 1.25 mm	17 mm	10 mm	Class 10	5	99183A560	00000
				M10 × 1.5 mm	17 mm	10 mm	Class 10	10	99183A550	00000
				M12 × 1.25 mm	19 mm	12 mm	Class 10	5	99183A570	00000
				M12 × 1.5 mm	19 mm	12 mm	Class 10	5	99183A580	00000
				M12 × 1.75 mm	19 mm	12 mm	Class 10	5	99183A590	0000
				M14 × 1.5 mm	22 mm	14 mm	Class 10	5	99183A610	00000
				M14 × 2 mm	22 mm	14 mm	Class 10	5	99183A620	00000


				M16 × 1.5 mm	24 mm	16 mm	Class 10	1	99183A630	0000
				M16 × 2 mm	24 mm	16 mm	Class 10	5	99183A640	00000
				M20 × 2.5 mm	30 mm	20 mm	Class 10	1	99183A680	0000
				M22 × 1.5 mm	33 mm	22 mm	Class 10	1	99183A690	0000
				M22 × 2.5 mm	33 mm	22 mm	Class 10	1	99183A710	0000


				Zinc-Flake-Coated Steel



						1/4"-20	7/16"	7/32"	ASTM Grade C	25	99291A550	00000


						5/16"-18	1/2"	17/64"	ASTM Grade C	10	99291A560	0000
						3/8"-16	9/16"	21/64"	ASTM Grade C	10	99291A570	00000
						3/8"-24	9/16"	21/64"	ASTM Grade C	10	99291A680	00000
						7/16"-14	11/16"	3/8"	ASTM Grade C	5	99291A580	00000
7/16"-20						11/16"	3/8"	ASTM Grade C	5	99291A690	00000
1/2"-13	3/4"					7/16"	ASTM Grade C	5	99291A590	00000
1/2"-20	3/4"					7/16"	ASTM Grade C	5	99291A710	00000
9/16"-18	7/8"					31/64"	ASTM Grade C	1	99291A720	0000
5/8"-11	15/16"					35/64"	ASTM Grade C	1	99291A620	0000
5/8"-18	15/16"					35/64"	ASTM Grade C	1	99291A730	0000


3/4"-10	1 1/8"					41/64"	ASTM Grade C	1	99291A630	0000
3/4"-16	1 1/8"					41/64"	ASTM Grade C	1	99291A740	0000
1"-8	1 1/2"					55/64"	ASTM Grade C	1	99291A650	00000


Cadmium-Plated Steel



						1/4"-20	7/16"	7/32"	ASTM Grade C	100	92501A029	00000


						1/4"-28	7/16"	7/32"	ASTM Grade C	100	92501A420	00000
						5/16"-18	1/2"	17/64"	ASTM Grade C	100	92501A030	00000
						5/16"-24	1/2"	17/64"	ASTM Grade C	100	92501A425	00000
						3/8"-16	9/16"	21/64"	ASTM Grade C	100	92501A031	00000
						3/8"-24	9/16"	21/64"	ASTM Grade C	50	92501A430	0000
						7/16"-14	11/16"	3/8"	ASTM Grade C	50	92501A433	00000
						7/16"-20	11/16"	3/8"	ASTM Grade C	50	92501A435	00000
						1/2"-13	3/4"	7/16"	ASTM Grade C	50	92501A437	00000
						1/2"-20	3/4"	7/16"	ASTM Grade C	50	92501A440	00000
		9/16"-12				7/8"	31/64"	ASTM Grade C	25	92501A442	00000


		9/16"-18	7/8"			31/64"	ASTM Grade C	25	92501A445	00000
		5/8"-11	15/16"			35/64"	ASTM Grade C	25	92501A035	00000
		5/8"-18	15/16"			35/64"	ASTM Grade C	25	92501A450	00000
		3/4"-10	1 1/8"			41/64"	ASTM Grade C	10	92501A036	00000
		3/4"-16	1 1/8"			41/64"	ASTM Grade C	10	92501A455	00000
		7/8"-9	1 5/16"			3/4"	ASTM Grade C	10	92501A457	00000
		7/8"-14	1 5/16"			3/4"	ASTM Grade C	5	92501A460	0000
		1"-8	1 1/2"			55/64"	ASTM Grade C	5	92501A462	00000
		1"-14	1 1/2"			55/64"	ASTM Grade C	5	92501A465	00000


		Steel



						1/4"-20	7/16"	7/32"	ASTM Grade C	100	92501A501	0000


						1/4"-28	7/16"	7/32"	ASTM Grade C	100	92501A502	0000
						5/16"-18	1/2"	17/64"	ASTM Grade C	100	92501A503	0000
						5/16"-24	1/2"	17/64"	ASTM Grade C	100	92501A504	0000
						3/8"-16	9/16"	21/64"	ASTM Grade C	100	92501A505	0000
						3/8"-24	9/16"	21/64"	ASTM Grade C	100	92501A506	0000
						7/16"-14	11/16"	3/8"	ASTM Grade C	50	92501A507	0000
				7/16"-20		11/16"	3/8"	ASTM Grade C	50	92501A508	0000
				1/2"-13	3/4"	7/16"	ASTM Grade C	50	92501A509	00000
				1/2"-20	3/4"	7/16"	ASTM Grade C	50	92501A510	00000
				9/16"-12	7/8"	31/64"	ASTM Grade C	25	92501A511	0000


				9/16"-18	7/8"	31/64"	ASTM Grade C	25	92501A512	0000
				5/8"-11	15/16"	35/64"	ASTM Grade C	25	92501A513	00000
				5/8"-18	15/16"	35/64"	ASTM Grade C	25	92501A514	00000
				3/4"-10	1 1/8"	41/64"	ASTM Grade C	10	92501A515	0000
				3/4"-16	1 1/8"	41/64"	ASTM Grade C	10	92501A516	0000
				7/8"-14	1 5/16"	3/4"	ASTM Grade C	10	92501A518	00000
				1"-8	1 1/2"	55/64"	ASTM Grade C	5	92501A519	0000

Medium-Strength Steel

These Grade 5 or Class 8 nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

	Thread Size	Wd.	Ht.	Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Yellow-Chromate-Plated Steel



		M36 × 4 mm	55 mm	36 mm	Class 8	DIN 980V	1	93795A321	000000


		Zinc-Plated Steel



				1/4"-20	7/16"	1/4"	SAE Grade 5	—	100	95065A150	00000


				1/4"-28	7/16"	1/4"	SAE Grade 5	—	50	95065A104	00000
				5/16"-18	1/2"	19/64"	SAE Grade 5	—	50	95065A160	00000
				5/16"-24	1/2"	19/64"	SAE Grade 5	—	50	95065A105	00000
				3/8"-16	9/16"	3/8"	SAE Grade 5	—	50	95065A171	00000
				3/8"-24	9/16"	3/8"	SAE Grade 5	—	50	95065A106	00000
				7/16"-14	11/16"	27/64"	SAE Grade 5	—	50	95065A101	00000
				7/16"-20	11/16"	27/64"	SAE Grade 5	—	25	95065A107	00000
				1/2"-13	3/4"	1/2"	SAE Grade 5	—	25	95065A191	00000
				1/2"-20	3/4"	1/2"	SAE Grade 5	—	10	95065A108	0000
				5/8"-11	15/16"	5/8"	SAE Grade 5	—	10	95065A220	00000


				5/8"-18	15/16"	5/8"	SAE Grade 5	—	10	95065A109	0000
				3/4"-10	1 1/8"	3/4"	SAE Grade 5	—	10	95065A230	00000
				7/8"-9	1 5/16"	13/16"	SAE Grade 5	—	5	95065A102	00000
				7/8"-14	1 5/16"	13/16"	SAE Grade 5	—	5	95065A111	00000
				1"-8	1 1/2"	15/16"	SAE Grade 5	—	5	95065A103	00000
				1"-14	1 1/2"	15/16"	SAE Grade 5	—	1	95065A112	00000
				M3 × 0.5 mm	5.5 mm	3.7 mm	Class 8	DIN 980V	50	93795A200	00000
				M4 × 0.7 mm	7 mm	4.2 mm	Class 8	DIN 980V	100	93795A205	00000
				M5 × 0.8 mm	8 mm	5.1 mm	Class 8	DIN 980V	100	93795A210	00000
				M6 × 1 mm	10 mm	6 mm	Class 8	DIN 980V	100	93795A220	0000


				M8 × 1.25 mm	13 mm	8 mm	Class 8	DIN 980V	50	93795A230	0000
				M10 × 1.25 mm	17 mm	10 mm	Class 8	DIN 980V	25	93795A333	0000
				M10 × 1.5 mm	17 mm	10 mm	Class 8	DIN 980V	25	93795A240	0000
				M12 × 1.25 mm	19 mm	12 mm	Class 8	DIN 980V	25	93795A337	00000
				M12 × 1.5 mm	19 mm	12 mm	Class 8	DIN 980V	10	93795A334	00000
				M12 × 1.75 mm	19 mm	12 mm	Class 8	DIN 980V	25	93795A250	00000
				M14 × 1.5 mm	22 mm	14 mm	Class 8	DIN 980V	10	93795A335	00000
				M14 × 2 mm	22 mm	14 mm	Class 8	DIN 980V	10	93795A257	00000
				M16 × 1.5 mm	24 mm	16 mm	Class 8	DIN 980V	5	93795A336	00000
				M16 × 2 mm	24 mm	16 mm	Class 8	DIN 980V	10	93795A260	00000


				M18 × 1.5 mm	27 mm	18 mm	Class 8	DIN 980V	1	93795A338	0000
				M18 × 2.5 mm	27 mm	18 mm	Class 8	DIN 980V	5	93795A265	00000
				M20 × 1.5 mm	30 mm	20 mm	Class 8	DIN 980V	1	93795A339	0000
				M20 × 2.5 mm	30 mm	20 mm	Class 8	DIN 980V	5	93795A270	00000
				M24 × 1.5 mm	36 mm	24 mm	Class 8	DIN 980V	1	93795A343	0000
				M24 × 3 mm	36 mm	24 mm	Class 8	DIN 980V	1	93795A280	0000
				M27 × 3 mm	41 mm	27 mm	Class 8	DIN 980V	1	93795A311	0000
				M30 × 3.5 mm	46 mm	30 mm	Class 8	DIN 980V	1	93795A312	0000


				Black-Oxide Steel



						1/4"-20	7/16"	1/4"	SAE Grade 5	—	50	90673A101	00000


1/4"-28	7/16"					1/4"	SAE Grade 5	—	50	90673A111	0000
5/16"-18	1/2"					19/64"	SAE Grade 5	—	50	90673A102	00000
5/16"-24	1/2"					19/64"	SAE Grade 5	—	50	90673A112	00000
3/8"-16	9/16"					3/8"	SAE Grade 5	—	25	90673A103	00000
3/8"-24	9/16"					3/8"	SAE Grade 5	—	50	90673A113	00000
7/16"-14	11/16"	27/64"				SAE Grade 5	—	25	90673A107	00000
7/16"-20	11/16"	27/64"	SAE Grade 5			—	25	90673A114	00000
1/2"-13	3/4"	1/2"	SAE Grade 5			—	10	90673A104	0000
1/2"-20	3/4"	1/2"	SAE Grade 5			—	10	90673A115	00000
5/8"-11	15/16"	5/8"	SAE Grade 5			—	5	90673A105	00000


5/8"-18	15/16"	5/8"	SAE Grade 5			—	10	90673A116	00000
3/4"-10	1 1/8"	3/4"	SAE Grade 5			—	5	90673A106	00000
7/8"-9	1 5/16"	13/16"	SAE Grade 5			—	1	90673A108	00000
7/8"-14	1 5/16"	13/16"	SAE Grade 5			—	1	90673A117	0000
1"-8	1 1/2"	15/16"	SAE Grade 5			—	1	90673A109	0000
1"-14	1 1/2"	15/16"	SAE Grade 5			—	1	90673A118	0000

Low-Strength Steel

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

	Wd.	Ht.	Fastener Strength Grade/Class	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	6-32	5/16"	7/64"	SAE Grade 2	100	91837A008	000000


	8-32	11/32"	1/8"	SAE Grade 2	100	91837A011	0000
	10-24	3/8"	1/8"	SAE Grade 2	100	91837A014	00000
	10-32	3/8"	1/8"	SAE Grade 2	100	91837A017	00000
	1/4"-20	7/16"	7/32"	SAE Grade 2	100	91837A029	00000
	1/4"-28	7/16"	7/32"	SAE Grade 2	100	91837A250	00000
	5/16"-18	1/2"	17/64"	SAE Grade 2	100	91837A030	00000
	5/16"-24	1/2"	17/64"	SAE Grade 2	100	91837A253	00000
	3/8"-16	9/16"	21/64"	SAE Grade 2	50	91837A031	00000
	1/2"-13	3/4"	7/16"	SAE Grade 2	10	91837A262	0000
	1/2"-20	3/4"	7/16"	SAE Grade 2	25	91837A265	00000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

316 Stainless Steel—Our most corrosion-resistant nuts, these hold up in just about any environment. They won't degrade from exposure to weather, salt water, and most chemicals.

	Wd.	Ht.	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	6-32	5/16"	7/64"	—	50	90045A010	00000


	8-32	11/32"	1/8"	—	50	90045A013	0000
	10-24	3/8"	1/8"	—	50	90045A016	0000
	10-32	3/8"	1/8"	—	50	90045A018	0000
	1/4"-20	7/16"	7/32"	—	50	90045A445	00000
	1/4"-28	7/16"	7/32"	—	25	90045A450	0000
	5/16"-18	1/2"	17/64"	—	25	90045A453	0000
	5/16"-24	1/2"	17/64"	—	25	90045A455	0000
	3/8"-16	9/16"	21/64"	—	25	90045A457	0000
	3/8"-24	9/16"	21/64"	—	10	90045A461	0000
	7/16"-14	11/16"	3/8"	—	10	90045A462	0000


	7/16"-20	11/16"	3/8"	—	5	90045A465	0000
	1/2"-13	3/4"	7/16"	—	10	90045A467	0000
	1/2"-20	3/4"	7/16"	—	5	90045A471	0000
	5/8"-11	15/16"	35/64"	—	5	90045A472	0000
	5/8"-18	15/16"	35/64"	—	1	90045A475	0000
	3/4"-10	1 1/8"	41/64"	—	1	90045A480	0000
	3/4"-16	1 1/8"	41/64"	—	1	90045A495	0000
	1"-8	1 1/2"	55/64"	—	1	90045A500	0000
	M4 × 0.7 mm	7 mm	3.2 mm	DIN 980, ISO 7042	25	90045A111	00000
	M5 × 0.8 mm	8 mm	4 mm	DIN 980, ISO 7042	25	90045A112	00000


	M6 × 1 mm	10 mm	6 mm	DIN 980, ISO 7042	10	90045A113	0000
	M7 × 1 mm	11 mm	5.5 mm	DIN 980, ISO 7042	5	90045A114	00000
	M8 × 1 mm	13 mm	6.4 mm	DIN 980, ISO 7042	5	90045A116	00000
	M8 × 1.25 mm	13 mm	6.4 mm	DIN 980, ISO 7042	10	90045A115	00000
	M10 × 1.25 mm	17 mm	10 mm	DIN 980, ISO 7042	1	90045A119	0000
	M10 × 1.5 mm	17 mm	8 mm	DIN 980, ISO 7042	5	90045A117	00000
	M12 × 1.75 mm	19 mm	12 mm	DIN 980, ISO 7042	1	90045A121	0000
	M14 × 2 mm	22 mm	14 mm	DIN 980, ISO 7042	1	90045A124	0000
	M16 × 1.5 mm	24 mm	16 mm	DIN 980, ISO 7042	1	90045A127	00000
	M16 × 2 mm	24 mm	16 mm	DIN 980, ISO 7042	1	90045A126	00000


	316 Stainless Steel



			8-32	11/32"	1/8"	—	10	95885A410	0000


			10-24	3/8"	1/8"	—	10	95885A415	0000
			10-32	3/8"	1/8"	—	10	95885A420	0000
			1/4"-20	7/16"	7/32"	—	10	95885A425	0000
			5/16"-18	1/2"	17/64"	—	10	95885A430	0000
			3/8"-16	9/16"	21/64"	—	10	95885A435	0000
			1/2"-13	3/4"	7/16"	—	5	95885A440	0000

Mil. Spec. Nylon-Insert Locknuts

These locknuts are manufactured and tested to strict U.S. military standards for material and construction. The nylon insert grips the screw to prevent loosening from moderate vibration without damaging threads. However, the insert may become brittle if exposed to high temperatures. These locknuts are reusable a handful of times, but the holding power decreases with each use.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

Low-Strength Steel

Image of Product. Front orientation. Locknuts. Mil. Spec. Nylon-Insert Locknuts.

Cadmium Yellow-Chromate-Plated Steel—These locknuts have good lubricity to thread on smoothly and ease installation. The plating also creates a barrier against rust that's comparable to zinc-yellow-chromate plating.

	Wd.	Ht.	Mil. Spec.	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
Cadmium Yellow-Chromate-Plated Steel



	4-40	1/4"	5/32"	MS21044-N04	250	10	95154A110	000000


	6-32	5/16"	3/16"	MS21044-N06	250	10	95154A120	00000
	8-32	11/32"	9/32"	MS21044-N08	250	10	95154A130	0000
	10-32	3/8"	9/32"	MS21044-N3	250	10	95154A140	0000
	1/4"-28	7/16"	23/64"	MS21044-N4	250	10	95154A150	0000
	5/16"-24	1/2"	23/64"	MS21044-N5	250	5	95154A160	0000
	3/8"-24	9/16"	15/32"	MS21044-N6	250	5	95154A170	00000
	1/2"-20	3/4"	19/32"	MS21044-N8	250	5	95154A180	0000
	5/8"-18	15/16"	3/4"	MS21044-N10	250	1	95154A190	0000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

	Wd.	Ht.	Mil. Spec.	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	2-56	1/4"	9/64"	MS17830-02C, MS21044C02, NASM17830, NASM21044	250	1	96345A186	00000


	4-40	1/4"	5/32"	MS21044C04, NASM21044	250	10	96345A210	00000
	6-32	5/16"	3/16"	MS21044C06, NASM21044	250	10	96345A220	0000
	8-32	11/32"	9/32"	MS21044C08, NASM21044	250	10	96345A230	00000
	10-24	3/8"	15/64"	MS17830-010C, NASM17830	250	5	96345A280	0000
	10-32	3/8"	9/32"	MS21044C3, NASM21044	250	10	96345A240	00000
	1/4"-20	7/16"	5/16"	MS17830-4C, NASM17830	250	5	96345A290	00000
	1/4"-28	7/16"	23/64"	MS21044C4, NASM21044	250	5	96345A250	00000
	5/16"-18	1/2"	11/32"	MS17830-5C, NASM17830	250	5	96345A310	00000
	3/8"-16	9/16"	29/64"	MS17830-6C, NASM17830	250	1	96345A320	0000
	3/8"-24	9/16"	15/32"	MS17830-6F, MS21044C6, NASM17830, NASM21044	250	1	96345A342	0000


	7/16"-20	11/16"	15/32"	MS17830-7F, MS21044C7, NASM17830, NASM21044	250	1	96345A765	00000

Center-Lock Distorted-Thread Locknuts

Also known as reversible locknuts, these thread on from either side, so you don't have to worry about fastening them incorrectly and damaging your screw. The irregularly shaped threads in the middle grip the screw for a stronger hold than nylon-insert locknuts. Although the threads prevent the nut from backing out due to vibration, they also increase the effort to install and remove. To get these nuts off, you may need special tools, such as an impact wrench or propane torch. Nuts are not reusable.

High-Strength Steel

	Wd.	Ht.	Fastener Strength Grade/Class	Pkg. Qty.		Pkg.
Zinc-Yellow-Chromate-Plated Steel



	1/4"-20	7/16"	7/32"	SAE Grade 8	50	90636A038	000000


	1/4"-28	7/16"	7/32"	SAE Grade 8	50	90636A041	00000
	5/16"-18	1/2"	17/64"	SAE Grade 8	50	90636A043	00000
	5/16"-24	1/2"	17/64"	SAE Grade 8	50	90636A046	00000
	3/8"-16	9/16"	21/64"	SAE Grade 8	25	90636A049	0000
	3/8"-24	9/16"	21/64"	SAE Grade 8	25	90636A051	00000
	7/16"-14	11/16"	3/8"	SAE Grade 8	10	90636A054	0000
	7/16"-20	11/16"	3/8"	SAE Grade 8	10	90636A057	0000
	1/2"-13	3/4"	7/16"	SAE Grade 8	10	90636A060	0000
	1/2"-20	3/4"	7/16"	SAE Grade 8	10	90636A063	00000
	9/16"-12	7/8"	31/64"	SAE Grade 8	10	90636A066	00000


	5/8"-11	15/16"	35/64"	SAE Grade 8	5	90636A071	0000
	5/8"-18	15/16"	35/64"	SAE Grade 8	5	90636A074	0000
	3/4"-10	1 1/8"	41/64"	SAE Grade 8	5	90636A077	0000
	3/4"-16	1 1/8"	41/64"	SAE Grade 8	5	90636A080	00000
	7/8"-9	1 5/16"	3/4"	SAE Grade 8	5	90636A083	00000
	1"-8	1 1/2"	55/64"	SAE Grade 8	1	90636A089	0000
	1"-14	1 1/2"	55/64"	SAE Grade 8	1	90636A111	00000


	Black-Oxide Steel



			1/4"-20	7/16"	7/32"	SAE Grade 8	10	90636A112	0000


			5/16"-18	1/2"	17/64"	SAE Grade 8	10	90636A113	0000
			3/8"-16	9/16"	21/64"	SAE Grade 8	10	90636A114	0000
			1/2"-13	3/4"	7/16"	SAE Grade 8	5	90636A115	00000
			5/8"-11	15/16"	35/64"	SAE Grade 8	1	90636A116	0000
			7/8"-9	1 5/16"	3/4"	SAE Grade 8	1	90636A117	00000
			1"-8	1 1/2"	55/64"	SAE Grade 8	1	90636A118	00000
			1"-14	1 1/2"	55/64"	SAE Grade 8	1	90636A119	00000


			Zinc-Flake-Coated Steel



					1/4"-20	7/16"	7/32"	SAE Grade 8	10	90636A121	0000


					5/16"-18	1/2"	17/64"	SAE Grade 8	10	90636A122	00000
					3/8"-16	9/16"	21/64"	SAE Grade 8	5	90636A123	0000
					1/2"-13	3/4"	7/16"	SAE Grade 8	5	90636A124	00000
					5/8"-11	15/16"	35/64"	SAE Grade 8	1	90636A125	0000
					1"-8	1 1/2"	55/64"	SAE Grade 8	1	90636A127	00000

Medium-Strength Steel

These Grade 5 or Class 8 nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

	Wd., mm	Ht., mm	Fastener Strength Grade/Class	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M5 × 0.8 mm	8	4	Class 8	10	92048A110	000000


	M6 × 1 mm	10	5	Class 8	10	92048A120	00000
	M7 × 1 mm	11	5.5	Class 8	5	92048A130	0000
	M8 × 1 mm	13	6.5	Class 8	10	92048A150	00000
	M8 × 1.25 mm	13	6.5	Class 8	10	92048A140	00000
	M10 × 1 mm	17	8	Class 8	5	92048A180	0000
	M10 × 1.25 mm	17	8	Class 8	5	92048A170	0000
	M10 × 1.5 mm	17	8	Class 8	10	92048A160	00000
	M12 × 1.25 mm	19	10	Class 8	5	92048A210	00000
	M12 × 1.5 mm	19	10	Class 8	5	92048A220	00000
	M12 × 1.75 mm	19	10	Class 8	5	92048A190	0000


	M14 × 1.5 mm	22	11	Class 8	5	92048A240	00000
	M14 × 2 mm	22	11	Class 8	5	92048A230	00000
	M16 × 1.5 mm	24	13	Class 8	5	92048A260	00000
	M16 × 2 mm	24	13	Class 8	5	92048A250	00000
	M22 × 1.5 mm	32	18	Class 8	1	92048A330	00000

Low-Strength Steel

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

	Wd.	Ht.	Fastener Strength Grade/Class	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	1/4"-20	7/16"	7/32"	SAE Grade 2	100	90040A029	00000


	1/4"-28	7/16"	7/32"	SAE Grade 2	100	90040A120	00000
	5/16"-18	1/2"	17/64"	SAE Grade 2	100	90040A030	0000
	5/16"-24	1/2"	17/64"	SAE Grade 2	100	90040A125	0000
	3/8"-16	9/16"	21/64"	SAE Grade 2	100	90040A031	00000
	3/8"-24	9/16"	21/64"	SAE Grade 2	100	90040A130	00000
	7/16"-14	11/16"	3/8"	SAE Grade 2	50	90040A032	00000
	7/16"-20	11/16"	3/8"	SAE Grade 2	50	90040A135	00000
	1/2"-13	3/4"	7/16"	SAE Grade 2	50	90040A137	00000
	1/2"-20	3/4"	7/16"	SAE Grade 2	50	90040A140	00000
	5/8"-11	15/16"	35/64"	SAE Grade 2	25	90040A143	00000


	5/8"-18	15/16"	35/64"	SAE Grade 2	25	90040A145	00000
	3/4"-10	1 1/8"	41/64"	SAE Grade 2	10	90040A147	00000
	3/4"-16	1 1/8"	41/64"	SAE Grade 2	10	90040A150	00000
	1"-14	1 1/2"	55/64"	SAE Grade 2	5	90040A155	00000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

316 Stainless Steel—Our most corrosion-resistant nuts, these hold up in just about any environment. They won't degrade from exposure to weather, salt water, and most chemicals.

	Wd.	Ht.	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	1/4"-20	7/16"	7/32"	50	90047A029	00000


	1/4"-28	7/16"	7/32"	50	90047A110	00000
	5/16"-18	1/2"	17/64"	50	90047A115	00000
	5/16"-24	1/2"	17/64"	25	90047A120	0000
	3/8"-16	9/16"	21/64"	25	90047A125	0000
	3/8"-24	9/16"	21/64"	25	90047A130	00000
	7/16"-14	11/16"	3/8"	10	90047A131	0000
	7/16"-20	11/16"	3/8"	10	90047A133	0000
	1/2"-13	3/4"	7/16"	10	90047A135	0000
	1/2"-20	3/4"	7/16"	10	90047A140	0000
	5/8"-11	15/16"	35/64"	5	90047A145	0000


	5/8"-18	15/16"	35/64"	5	90047A150	00000
	3/4"-10	1 1/8"	41/64"	5	90047A155	00000
	3/4"-16	1 1/8"	41/64"	1	90047A160	0000
	7/8"-9	1 5/16"	3/4"	1	90047A165	0000
	1"-8	1 1/2"	55/64"	1	90047A170	0000
	1"-14	1 1/2"	55/64"	1	90047A175	0000


	316 Stainless Steel



			1/4"-20	7/16"	7/32"	10	95878A300	0000


			5/16"-18	1/2"	17/64"	10	95878A310	0000
			3/8"-16	9/16"	21/64"	10	95878A320	0000
			1/2"-13	3/4"	7/16"	5	95878A330	0000
			5/8"-11	15/16"	35/64"	1	95878A340	0000
			3/4"-10	1 1/8"	41/64"	1	95878A350	0000

Flex-Top Locknuts for Heavy Vibration

The top section of these nuts expands to grip the screw on all sides for a stronger hold than both nylon-insert and distorted-thread locknuts. They’re often used in equipment with constant, vigorous vibration, such as engines. These locknuts are reusable a handful of times, but the holding power decreases with each use.

Steel

These locknuts have equivalent strength to Grade 8 and Class 10 steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

	Wd.	Ht.	Pkg. Qty.		Pkg.
Black-Oxide Steel



	1/4"-20	7/16"	19/64"	5	94820A370	00000


	1/4"-28	7/16"	5/16"	5	94820A380	0000
	5/16"-18	1/2"	23/64"	5	94820A390	0000
	5/16"-24	1/2"	23/64"	5	94820A410	0000
	3/8"-16	9/16"	15/32"	5	94820A420	0000
	3/8"-24	9/16"	15/32"	5	94820A430	0000
	7/16"-14	5/8"	15/32"	1	94820A440	0000
	1/2"-13	3/4"	39/64"	1	94820A450	0000
	1/2"-20	3/4"	39/64"	1	94820A460	0000
	5/8"-11	15/16"	49/64"	1	94820A470	0000
	5/8"-18	15/16"	49/64"	1	94820A480	0000


	3/4"-10	1 1/16"	57/64"	1	94820A490	0000
	3/4"-16	1 1/16"	57/64"	1	94820A510	0000
	M6 × 1 mm	10 mm	7.8 mm	1	94235A111	0000
	M8 × 1.25 mm	13 mm	10.4 mm	1	94235A112	0000
	M10 × 1.5 mm	15 mm	13 mm	1	94235A113	0000
	M12 × 1.75 mm	19 mm	15.6 mm	1	94235A114	0000


	Cadmium-Plated Steel



			4-40	1/4"	5/32"	10	94820A210	00000


			6-32	5/16"	3/16"	25	94820A215	0000
			8-32	11/32"	1/4"	25	94820A220	00000
			10-24	3/8"	1/4"	25	94820A225	00000
			10-32	3/8"	1/4"	25	94820A230	00000
			1/4"-20	7/16"	19/64"	25	94820A232	00000
			1/4"-28	7/16"	5/16"	25	94820A235	00000
			5/16"-18	1/2"	23/64"	10	94820A237	0000
			5/16"-24	1/2"	23/64"	10	94820A240	0000
			3/8"-16	9/16"	15/32"	10	94820A242	00000
			3/8"-24	9/16"	15/32"	10	94820A245	00000


			7/16"-14	5/8"	15/32"	5	94820A247	0000
			7/16"-20	5/8"	15/32"	1	94820A310	0000
			1/2"-13	3/4"	39/64"	5	94820A249	0000
			1/2"-20	3/4"	39/64"	5	94820A250	00000
			9/16"-18	7/8"	31/64"	1	94820A320	0000
			5/8"-11	15/16"	49/64"	1	94820A252	0000
			5/8"-18	15/16"	49/64"	1	94820A255	0000
			3/4"-10	1 1/16"	57/64"	1	94820A036	0000
			3/4"-16	1 1/16"	57/64"	1	94820A260	0000
			7/8"-9	1 1/4"	1 1/64"	1	94820A330	00000


			7/8"-14	1 1/4"	1 1/64"	1	94820A340	00000
			1"-8	1 7/16"	1 9/64"	1	94820A350	00000
			1"-14	1 7/16"	1 9/64"	1	94820A360	00000
			M6 × 1 mm	10 mm	7.8 mm	5	94235A080	0000
			M8 × 1.25 mm	13 mm	10.4 mm	1	94235A090	0000
			M10 × 1.5 mm	15 mm	13 mm	1	94235A110	0000
			M12 × 1.75 mm	19 mm	15.6 mm	1	94235A120	0000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

316 Stainless Steel—Our most corrosion-resistant nuts, these hold up in just about any environment. They won't degrade from exposure to weather, salt water, and most chemicals.

	Thread Size	Wd.	Ht.	Pkg. Qty.		Pkg.
18-8 Stainless Steel



		2-56	1/4"	5/32"	5	91839A105	000000


		6-32	5/16"	3/16"	5	91839A225	0000
		8-32	11/32"	1/4"	5	91839A230	0000
		10-24	3/8"	1/4"	5	91839A235	0000
		10-32	3/8"	1/4"	10	91839A120	00000
		1/4"-20	7/16"	19/64"	5	91839A123	00000
		1/4"-28	7/16"	19/64"	5	91839A125	0000
		5/16"-18	1/2"	23/64"	1	91839A127	0000
		5/16"-24	1/2"	23/64"	1	91839A130	0000
		3/8"-16	9/16"	15/32"	1	91839A132	0000
		3/8"-24	9/16"	15/32"	1	91839A135	0000


		7/16"-20	5/8"	15/32"	1	91839A140	00000
		1/2"-13	3/4"	39/64"	1	91839A033	0000
		1/2"-20	3/4"	39/64"	1	91839A145	0000
		M3 × 0.5 mm	5.5 mm	4.5 mm	1	94560A111	0000
		M4 × 0.7 mm	7 mm	6 mm	1	94560A112	0000
		M5 × 0.8 mm	8 mm	7.5 mm	1	94560A113	0000
		M6 × 1 mm	10 mm	7.8 mm	1	94560A060	0000
		M8 × 1.25 mm	13 mm	10.4 mm	1	94560A080	0000
		M10 × 1.5 mm	17 mm	13 mm	1	94560A100	00000
		M12 × 1.75 mm	19 mm	15.6 mm	1	94560A120	00000


		M14 × 2 mm	22 mm	18.2 mm	1	94560A114	00000
		M16 × 2 mm	24 mm	20.8 mm	1	94560A115	00000
		M18 × 2.5 mm	27 mm	23.4 mm	1	94560A116	00000
		M20 × 2.5 mm	30 mm	26 mm	1	94560A117	00000
		M22 × 2.5 mm	32 mm	28.6 mm	1	94560A118	00000
		M24 × 3 mm	36 mm	31.2 mm	1	94560A119	00000


		Black-Oxide 18-8 Stainless Steel



				8-32	11/32"	1/4"	5	91839A311	0000


				10-24	3/8"	1/4"	5	91839A312	0000
				10-32	3/8"	1/4"	5	91839A313	0000
				1/4"-20	7/16"	19/64"	5	91839A314	00000
				3/8"-16	9/16"	15/32"	1	91839A316	0000
				1/2"-13	3/4"	39/64"	1	91839A317	0000
				1/2"-20	3/4"	39/64"	1	91839A318	0000


				316 Stainless Steel



						M3 × 0.5 mm	5.5 mm	4.5 mm	1	94560A110	0000


						M4 × 0.7 mm	7 mm	6 mm	1	94560A130	0000
						M5 × 0.8 mm	8 mm	7.5 mm	1	94560A140	0000
						M6 × 1 mm	10 mm	7.8 mm	1	94560A150	0000
						M8 × 1.25 mm	13 mm	10.4 mm	1	94560A160	00000
M10 × 1.5 mm						17 mm	13 mm	1	94560A170	00000
M12 × 1.75 mm	19 mm					15.6 mm	1	94560A180	00000
M20 × 2.5 mm	30 mm					26 mm	1	94560A190	00000

Locknuts with External-Tooth Lock Washer

To save on assembly time, these locknuts combine a hex nut with a free-spinning lock washer, so you can twist them into place by hand. Once the nut is against your material surface, tighten it down with a wrench or socket to get the teeth to bite. Although these nuts install more quickly than nylon-insert locknuts, they don't hold up as well against vibration and can mar your material. As long as the washer stays intact, you can reuse them. Also known as Keps and K-lock nuts.

Medium-Strength Steel

These Grade 5 or Class 8 nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

Black-Zinc-Plated Steel—The dark zinc plating withstands occasional exposure to moisture while creating a finished look.

	Wd., mm	Ht., mm	Fastener Strength Grade/Class	Washer OD, mm	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M3 × 0.5 mm	5.5	3.3	Class 8	7.1	100	93825A110	000000


	M4 × 0.7 mm	7	4.1	Class 8	8.5	100	93825A120	00000
	M5 × 0.8 mm	8	5.2	Class 8	9.5	100	93825A130	00000
	M6 × 1 mm	10	6.2	Class 8	12	100	93825A140	00000
	M8 × 1.25 mm	13	8.5	Class 8	15.5	25	93825A160	0000
	M10 × 1.5 mm	17	9.7	Class 8	20.1	10	93825A170	00000


	Black-Zinc-Plated Steel



			M3 × 0.5 mm	5.5	3	Class 8	7.1	100	93825A210	00000


			M4 × 0.7 mm	7	4.1	Class 8	8.5	100	93825A220	00000
			M5 × 0.8 mm	8	5.2	Class 8	9.5	100	93825A230	00000
			M6 × 1 mm	10	6.2	Class 8	12	50	93825A240	00000
			M8 × 1.25 mm	13	8.5	Class 8	15.5	25	93825A250	00000
			M10 × 1.5 mm	17	9.7	Class 8	20.1	10	93825A260	00000

Low-Strength Steel

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

Black-Zinc-Plated Steel—The dark zinc plating withstands occasional exposure to moisture while creating a finished look.

	Wd.	Ht.	Washer OD	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	4-40	1/4"	7/64"	0.281"	100	90675A005	00000


	5-40	5/16"	9/64"	0.344"	100	90675A245	0000
	6-32	5/16"	9/64"	0.344"	100	90675A007	0000
	8-32	11/32"	5/32"	0.375"	100	90675A009	0000
	10-24	3/8"	5/32"	0.406"	100	90675A011	0000
	10-32	3/8"	5/32"	0.406"	100	90675A195	0000
	12-24	7/16"	3/16"	0.5"	50	90675A255	0000
	1/4"-20	7/16"	15/64"	0.5"	100	90675A029	0000
	1/4"-28	7/16"	15/64"	0.5"	100	90675A215	0000
	5/16"-18	1/2"	21/64"	0.578"	100	90675A030	00000
	5/16"-24	1/2"	5/16"	0.592"	50	90675A225	00000


	3/8"-16	9/16"	25/64"	0.656"	100	90675A031	00000
	3/8"-24	9/16"	25/64"	0.656"	100	90675A235	00000
	1/2"-13	3/4"	31/64"	0.891"	10	90675A265	0000


	Black-Zinc-Plated Steel



			4-40	1/4"	1/8"	0.281"	100	90328A101	0000


			6-32	5/16"	9/64"	0.344"	100	90328A102	0000
			8-32	11/32"	5/32"	0.375"	100	90328A103	0000
			10-24	3/8"	5/32"	0.406"	100	90328A104	0000
			10-32	3/8"	5/32"	0.406"	100	90328A105	0000
			1/4"-20	7/16"	7/32"	0.5"	100	90328A106	00000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

	Wd.	Ht.	Washer OD	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	4-40	1/4"	1/8"	0.281"	100	96278A005	000000


	4-48	1/4"	1/8"	0.281"	100	96278A101	00000
	6-32	5/16"	9/64"	0.344"	100	96278A007	00000
	8-32	11/32"	11/64"	0.375"	100	96278A009	00000
	10-24	3/8"	11/64"	0.406"	100	96278A011	00000
	10-32	3/8"	11/64"	0.406"	100	96278A411	00000
	12-24	7/16"	11/64"	0.506"	50	96278A111	00000
	1/4"-20	7/16"	15/64"	0.5"	50	96278A511	00000
	1/4"-28	7/16"	15/64"	0.5"	50	96278A515	00000
	5/16"-18	1/2"	21/64"	0.578"	25	96278A519	0000
	5/16"-24	1/2"	21/64"	0.578"	25	96278A523	00000


	3/8"-16	9/16"	25/64"	0.656"	25	96278A527	00000
	3/8"-24	9/16"	25/64"	0.656"	10	96278A531	0000
	1/2"-13	3/4"	7/16"	0.898"	10	96278A112	0000
	M3 × 0.5 mm	5.5 mm	3.3 mm	6.5 mm	50	90923A216	00000
	M4 × 0.7 mm	7 mm	4.1 mm	8.2 mm	50	90923A219	00000
	M5 × 0.8 mm	8 mm	5.2 mm	9.5 mm	25	90923A222	0000
	M6 × 1 mm	10 mm	6.2 mm	11.5 mm	25	90923A227	0000
	M8 × 1.25 mm	13 mm	8.5 mm	15.1 mm	5	90923A241	0000
	M10 × 1.5 mm	17 mm	9.7 mm	19.2 mm	5	90923A282	00000


	Black-Oxide 18-8 Stainless Steel



			M3 × 0.5 mm	5.5 mm	3.3 mm	6.5 mm	25	90923A231	0000


			M4 × 0.7 mm	7 mm	4.1 mm	8.2 mm	25	90923A232	00000
			M5 × 0.8 mm	8 mm	5.2 mm	9.5 mm	25	90923A233	00000
			M6 × 1 mm	10 mm	6.2 mm	11.5 mm	25	90923A234	00000

Mil. Spec. Thin-Profile Nylon-Insert Locknuts

These locknuts are manufactured and tested to strict U.S. military standards for material and construction. They are about half the height of standard-profile locknuts to fit in spaces with low clearance. You can also use them as jam nuts by threading them against a hex nut to hold it in place. The nylon insert grips the screw to prevent loosening from moderate vibration without damaging threads. However, the insert may become brittle if exposed to high temperatures. These locknuts are reusable a handful of times, but the holding power decreases with each use.

Low-Strength Steel

	Wd.	Ht.	Mil. Spec.	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
Cadmium Yellow-Chromate-Plated Steel



	4-40	1/4"	1/8"	MS21083N04, NASM21083	250	10	95496A310	000000


	6-32	5/16"	9/64"	MS21083N06, NASM21083	250	10	95496A320	00000
	8-32	11/32"	3/16"	MS21083N08, NASM21083	250	10	95496A330	0000
	10-32	3/8"	3/16"	MS21083N3, NASM21083	250	10	95496A340	0000
	1/4"-28	7/16"	7/32"	MS21083N4, NASM21083	250	10	95496A350	0000
	1/2"-20	3/4"	5/16"	MS21083N8, NASM21083	250	1	95496A380	0000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

	Wd.	Ht.	Mil. Spec.	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	2-56	1/4"	7/64"	MS21083C02, NASM21083	250	5	97231A480	000000


	4-40	1/4"	1/8"	MS21083C04, NASM21083	250	10	97231A410	00000
	6-32	5/16"	9/64"	MS21083C06, NASM21083	250	10	97231A420	00000
	8-32	11/32"	3/16"	MS21083C08, NASM21083	250	5	97231A430	0000
	10-32	3/8"	3/16"	MS21083C3, NASM21083	250	5	97231A440	00000
	1/4"-28	7/16"	7/32"	MS21083C4, NASM21083	250	5	97231A450	00000
	5/16"-24	1/2"	17/64"	MS21083C5, NASM21083	250	1	97231A460	0000
	3/8"-24	9/16"	9/32"	MS21083C6, NASM21083	250	1	97231A470	0000
	7/16"-20	11/16"	21/64"	MS21083C7, NASM21083	250	1	97231A510	00000
	1/2"-20	3/4"	5/16"	MS21083C8, NASM21083	250	1	97231A490	00000
	5/8"-18	15/16"	13/32"	MS21083C10, NASM21083	250	1	97231A520	00000

Mil. Spec. Flex-Top Locknuts for Heavy Vibration

These locknuts are manufactured and tested to strict U.S. military standards for material and construction. The top section expands to grip the screw on all sides for a stronger hold than both nylon-insert and distorted-thread locknuts. As a result, they're suitable for use in equipment with constant, vigorous vibration, such as engines. These locknuts are reusable a handful of times, but the holding power decreases with each use.

Steel

These locknuts have equivalent strength to Grade 8 and Class 10 steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

	Wd.	Ht.	Mil. Spec.	Pkg. Qty.		Pkg.
Cadmium-Plated Steel



	4-40	1/4"	5/32"	MS21045-04	5	99638A101	000000


	6-32	5/16"	3/16"	MS21045-06	5	99638A102	00000
	8-32	11/32"	1/4"	MS21045-08	5	99638A103	00000
	10-32	3/8"	1/4"	MS21045-3	5	99638A100	00000
	1/4"-28	7/16"	5/16"	MS21045-4	5	99638A200	00000
	5/16"-24	1/2"	23/64"	MS21045-5	5	99638A300	00000
	3/8"-24	9/16"	15/32"	MS21045-6	5	99638A400	00000
	7/16"-20	11/16"	15/32"	MS21045-7	1	99638A500	00000
	1/2"-20	3/4"	39/64"	MS21045-8	1	99638A600	00000
	9/16"-18	7/8"	11/16"	MS21045-9	1	99638A700	00000
	5/8"-18	15/16"	49/64"	MS21045-10	1	99638A800	00000


	3/4"-16	1 1/16"	57/64"	MS21045-12	1	99638A900	00000

Corrosion-Resistant Stainless Steel

Silver-Plated 18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts won't rust. The silver plating adds lubricity to help them thread on smoothly during installation.

	Wd.	Ht.	Mil. Spec.	Pkg. Qty.		Pkg.
Silver-Plated 18-8 Stainless Steel



	4-40	1/4"	9/64"	MS21046C04, NASM21046	1	99851A101	000000


	6-32	5/16"	11/64"	MS21046C06, NASM21046	1	99851A102	00000
	8-32	11/32"	15/64"	MS21046C08, NASM21046	1	99851A103	0000
	10-32	3/8"	15/64"	MS21046C3, NASM21046	1	99851A104	00000
	1/4"-28	7/16"	9/32"	MS21046C4, NASM21046	1	99851A105	00000
	3/8"-24	9/16"	25/64"	MS21046C6, NASM21046	1	99851A106	00000

Thin-Heavy-Profile Nylon-Insert Locknuts

About half the height of standard-profile locknuts and 10% wider, these fit in spaces with low clearance and handle heavier loads by distributing them over a larger area. You can also use them as jam nuts by threading them against a hex nut to hold it in place. The nylon insert grips the screw to prevent loosening from moderate vibration without damaging threads. However, the insert may become brittle if exposed to high temperatures. These locknuts are reusable a handful of times, but the holding power decreases with each use.

High-Strength Steel

Black-Phosphate-Coated Steel—The dark coating creates both a finished appearance and a barrier against rust that withstands occasional exposure to moisture.

Steel—Best for dry environments since moisture will cause these nuts to rust.

	Wd.	Ht.	Fastener Strength Grade/Class	Insert Max. Temp., ° F		Each
Black-Phosphate-Coated Steel



	1 1/4"-12	2"	1 7/64"	ASTM Grade C	250	93126A110	00000


	1 1/2"-12	2 3/8"	1 5/16"	ASTM Grade C	250	93126A120	00000
	1 3/4"-12	2 3/4"	1 15/32"	ASTM Grade C	250	93126A130	00000
	2"-12	3 1/8"	1 43/64"	ASTM Grade C	250	93126A140	00000
	2 1/4"-12	3 1/2"	1 15/16"	ASTM Grade C	250	93126A150	00000
	2 1/2"-12	4"	2 3/16"	ASTM Grade C	250	93126A160	00000
	2 3/4"-12	4"	2 3/16"	ASTM Grade C	250	93126A170	00000
	3"-12	4 1/2"	2 41/64"	ASTM Grade C	250	93126A210	000000


	Steel



			1 1/8"-12	1 7/8"	1"	ASTM Grade C	250	93126A180	00000


			1 3/8"-12	2 13/64"	1 3/16"	ASTM Grade C	250	93126A190	00000

Low-Strength Steel

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

	Wd.	Ht.	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	1/4"-20	1/2"	9/32"	250	100	90652A029	000000


	5/16"-18	9/16"	5/16"	250	100	90652A030	00000
	3/8"-16	11/16"	13/32"	250	50	90652A040	00000
	1/2"-13	7/8"	17/32"	250	25	90652A050	00000
	5/8"-11	1 1/16"	39/64"	250	10	90652A055	00000
	3/4"-10	1 1/4"	45/64"	250	10	90652A060	00000
	1"-8	1 5/8"	57/64"	250	1	90652A065	0000
	1 1/4"-7	2"	1 7/64"	250	1	90652A070	00000


	Black-Corrosion-Resistant-Coated Steel



			1/4"-20	1/2"	9/32"	250	5	90652A810	0000


			5/16"-18	9/16"	5/16"	250	5	90652A820	0000
			3/8"-16	11/16"	13/32"	250	1	90652A830	0000
			1/2"-13	7/8"	17/32"	250	1	90652A840	0000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

316 Stainless Steel—Our most corrosion-resistant nuts, these hold up in just about any environment. They won't degrade from exposure to weather, salt water, and most chemicals.

	Wd.	Ht.	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	1/4"-20	1/2"	9/32"	250	25	90098A110	000000


	5/16"-18	9/16"	5/16"	250	20	90098A115	00000
	3/8"-16	11/16"	13/32"	250	10	90098A120	00000
	1/2"-13	7/8"	17/32"	250	1	90098A130	0000
	5/8"-11	1 1/16"	5/8"	250	1	90098A035	0000
	3/4"-10	1 1/4"	45/64"	250	1	90098A036	00000
	1"-8	1 5/8"	59/64"	250	1	90098A135	00000


	316 Stainless Steel



			3/8"-16	11/16"	13/32"	250	1	94530A113	0000


			1/2"-13	7/8"	17/32"	250	1	94530A115	0000
			5/8"-11	1 1/16"	39/64"	250	1	94530A117	0000
			3/4"-10	1 1/4"	45/64"	250	1	94530A119	00000

Heavy-Profile Nylon-Insert Locknuts

About 10% wider and taller than standard-profile locknuts, these handle heavier loads by distributing them over a larger area. The nylon insert grips the screw to prevent loosening from moderate vibration without damaging threads. However, the insert may become brittle if exposed to high temperatures. These locknuts are reusable a handful of times, but the holding power decreases with each use.

High-Strength Steel

Steel—Best for dry environments since moisture will cause these nuts to rust.

	Wd.	Ht.	Fastener Strength Grade/Class	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
Zinc-Yellow-Chromate-Plated Steel



	1"-8	1 5/8"	1 9/32"	SAE Grade 8	220	1	97135A402	00000


	1 1/4"-7	2 1/64"	1 41/64"	SAE Grade 8	220	1	97135A403	00000
	1 1/2"-6	2 25/64"	1 59/64"	SAE Grade 8	220	1	97135A406	00000


	Black-Oxide Steel



			1"-8	1 5/8"	1 9/32"	SAE Grade 8	220	1	97135A443	0000


			1 1/4"-7	2 1/64"	1 41/64"	SAE Grade 8	220	1	97135A444	00000
			1 1/2"-6	2 25/64"	1 59/64"	SAE Grade 8	220	1	97135A447	00000


			Steel



					1"-8	1 5/8"	1 9/32"	SAE Grade 8	220	1	90630A208	00000


					1 1/2"-6	2 25/64"	1 59/64"	SAE Grade 8	220	1	90630A213	00000

Low-Strength Steel

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

	Wd.	Ht.	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	1/4"-20	1/2"	3/8"	250	100	90648A029	000000


	5/16"-18	9/16"	7/16"	250	100	90648A030	00000
	3/8"-16	11/16"	35/64"	250	50	90648A215	00000
	7/16"-14	3/4"	39/64"	Not Rated	25	90648A220	00000
	1/2"-13	7/8"	45/64"	250	25	90648A225	00000
	5/8"-11	1 1/16"	55/64"	250	10	90648A235	00000
	3/4"-10	1 1/4"	1"	250	5	90648A240	0000
	7/8"-9	1 7/16"	1 1/8"	250	5	90648A245	00000
	1"-8	1 5/8"	1 17/64"	250	1	90648A250	0000
	1 1/4"-7	2"	1 41/64"	250	1	90648A260	00000
	1 1/2"-6	2 3/8"	1 59/64"	250	1	90648A265	00000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

316 Stainless Steel—Our most corrosion-resistant nuts, these hold up in just about any environment. They won't degrade from exposure to weather, salt water, and most chemicals.

	Wd.	Ht.	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	1/4"-20	1/2"	3/8"	250	10	90099A029	00000


	5/16"-18	9/16"	7/16"	250	5	90099A030	0000
	3/8"-16	11/16"	35/64"	250	5	90099A031	0000
	1/2"-13	7/8"	45/64"	250	1	90099A033	0000
	5/8"-11	1 1/16"	55/64"	250	1	90099A035	0000
	3/4"-10	1 1/4"	1"	250	1	90099A036	00000
	7/8"-9	1 7/16"	1 9/64"	Not Rated	1	90099A037	00000
	1"-8	1 5/8"	1 5/16"	Not Rated	1	90099A038	00000


	316 Stainless Steel



			3/8"-16	11/16"	35/64"	250	1	94519A101	0000


			1/2"-13	7/8"	45/64"	250	1	94519A102	0000
			5/8"-11	1 1/16"	55/64"	250	1	94519A103	00000
			3/4"-10	1 1/4"	1"	250	1	94519A104	00000

High-Profile Nylon-Insert Locknuts

Slightly taller than standard-profile locknuts, these have a larger gripping area so your wrench or socket won't slip off as you tighten them. They're often used in vehicles and machinery where fasteners can be difficult to reach. The nylon insert grips the screw to prevent loosening from moderate vibration without damaging threads. However, the insert may become brittle if exposed to high temperatures. These locknuts are reusable a handful of times, but the holding power decreases with each use.

High-Strength Steel

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

	Wd., mm	Ht., mm	Fastener Strength Grade/Class	Insert Max. Temp., ° F	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M6 × 1 mm	10	8	Class 10	220	DIN 982	50	97260A101	00000


	M8 × 1.25 mm	13	9.5	Class 10	220	DIN 982	25	97260A102	0000
	M10 × 1.5 mm	17	11.5	Class 10	220	DIN 982	25	97260A103	00000
	M12 × 1.75 mm	19	14	Class 10	220	DIN 982	10	97260A104	00000
	M14 × 2 mm	22	16	Class 10	220	DIN 982	10	97260A105	00000
	M16 × 2 mm	24	18	Class 10	220	DIN 982	5	97260A106	00000
	M18 × 2.5 mm	27	20	Class 10	220	DIN 982	5	97260A107	00000
	M20 × 2.5 mm	30	22	Class 10	220	DIN 982	1	97260A108	0000
	M24 × 3 mm	36	28	Class 10	220	DIN 982	1	97260A109	0000

Medium-Strength Steel

These Grade 5 or Class 8 nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

	Wd., mm	Ht., mm	Fastener Strength Grade/Class	Insert Max. Temp., ° F	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Yellow-Chromate-Plated Steel



	M5 × 0.8 mm	8	6.3	Class 8	220	DIN 982, ISO 7040	100	90576A825	00000


	M6 × 1 mm	10	8	Class 8	220	DIN 982, ISO 7040	100	90576A826	00000
	M8 × 1.25 mm	13	9.5	Class 8	220	DIN 982, ISO 7040	100	90576A827	00000
	M10 × 1.5 mm	17	11.5	Class 8	220	DIN 982, ISO 7040	50	90576A828	00000
	M12 × 1.75 mm	19	14	Class 8	220	DIN 982, ISO 7040	25	90576A829	00000
	M16 × 2 mm	24	18	Class 8	220	DIN 982, ISO 7040	10	90576A831	0000
	M20 × 2.5 mm	32	22	Class 8	220	DIN 982, ISO 7040	5	90576A832	00000
	M24 × 3 mm	36	28	Class 8	220	DIN 982, ISO 7040	1	90576A833	0000


	Zinc-Plated Steel



			M4 × 0.7 mm	7	5.3	Class 8	220	DIN 982, ISO 7040	100	97131A110	0000


			M5 × 0.8 mm	8	6.3	Class 8	220	DIN 982, ISO 7040	100	97131A120	0000
			M6 × 1 mm	10	8	Class 8	220	DIN 982, ISO 7040	100	97131A130	0000
			M8 × 1.25 mm	13	9.5	Class 8	220	DIN 982, ISO 7040	50	97131A140	00000
			M10 × 1.5 mm	17	11.5	Class 8	220	DIN 982, ISO 7040	25	97131A150	00000
			M12 × 1.75 mm	19	14	Class 8	220	DIN 982, ISO 7040	25	97131A160	00000
			M14 × 1.5 mm	22	16	Class 8	220	DIN 982, ISO 7040	10	97272A110	00000
			M14 × 2 mm	22	16	Class 8	220	DIN 982, ISO 7040	10	97131A170	0000
			M16 × 1.5 mm	24	18	Class 8	220	DIN 982, ISO 7040	5	97272A120	0000
			M16 × 2 mm	24	18	Class 8	220	DIN 982, ISO 7040	10	97131A180	00000
			M18 × 2.5 mm	27	20	Class 8	220	DIN 982, ISO 7040	5	97131A190	00000


			M20 × 1.5 mm	30	22	Class 8	220	DIN 982, ISO 7040	1	97272A130	0000
			M20 × 2.5 mm	30	22	Class 8	220	DIN 982, ISO 7040	1	97131A210	0000
			M22 × 2.5 mm	32	25	Class 8	220	DIN 982, ISO 7040	1	97131A220	0000
			M24 × 3 mm	36	28	Class 8	220	DIN 982, ISO 7040	1	97131A230	0000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

316 Stainless Steel—Our most corrosion-resistant nuts, these hold up in just about any environment. They won't degrade from exposure to weather, salt water, and most chemicals.

	Wd., mm	Ht., mm	Insert Max. Temp., ° F	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	M4 × 0.7 mm	7	5.3	220	DIN 982	25	93625A111	00000


	M5 × 0.8 mm	8	6.3	220	DIN 982	25	93625A112	0000
	M6 × 1 mm	10	8	220	DIN 982	25	93625A113	0000
	M8 × 1.25 mm	13	9.5	220	DIN 982	10	93625A114	0000
	M10 × 1.5 mm	17	11.5	220	DIN 982	10	93625A115	0000
	M12 × 1.75 mm	19	14	220	DIN 982	5	93625A116	0000
	M16 × 2 mm	24	18	220	DIN 982	1	93625A117	0000
	18-8 Stainless Steel Nylon-Insert Locknut, M16 x 2 mm Thread, 24 mm Wide, 18 mm High Product Detail QuantityPack of 1In stock Select a compatible file type: Parasolid Compatible Products for This Locknut
	M20 × 2.5 mm	30	22	220	DIN 982	1	93625A118	0000


	316 Stainless Steel



			M4 × 0.7 mm	7	5.3	220	DIN 982	10	94205A151	0000


			M5 × 0.8 mm	8	6.3	220	DIN 982	10	94205A152	0000
			M6 × 1 mm	10	8	220	DIN 982	10	94205A153	0000
			M8 × 1.25 mm	13	9.5	220	DIN 982	10	94205A154	0000
			M10 × 1.5 mm	17	11.5	220	DIN 982	5	94205A155	0000
			M12 × 1.75 mm	19	14	220	DIN 982	5	94205A156	00000
			M16 × 2 mm	24	18	220	DIN 982	1	94205A157	0000
			M20 × 2.5 mm	30	22	220	DIN 982	1	94205A158	0000
			M24 × 3 mm	36	28	220	DIN 982	1	94205A159	00000

Thin-Profile Flex-Top Locknuts for Heavy Vibration

About two-thirds the height of standard flex-top nuts, these fit in spaces with low clearance. You can also use them as jam nuts by threading them against a hex nut to hold it in place. The top section expands to grip the screw on all sides for a stronger hold than both nylon-insert and distorted-thread locknuts. As a result, they're suitable for use in equipment with constant, vigorous vibration, such as engines. These locknuts are reusable a handful of times, but the holding power decreases with each use.

Steel

These locknuts have equivalent strength to Grade 8 and Class 10 steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Steel—Best for dry environments since moisture will cause these nuts to rust.

	Wd.	Ht.	Pkg. Qty.		Pkg.
Cadmium-Plated Steel



	6-32	5/16"	9/64"	25	94830A485	000000


	8-32	11/32"	3/16"	25	94830A490	00000
	10-24	3/8"	3/16"	25	94830A495	00000
	10-32	3/8"	3/16"	25	94830A505	00000
	1/4"-20	7/16"	7/32"	25	94830A510	00000
	1/4"-28	7/16"	7/32"	25	94830A515	00000
	5/16"-18	1/2"	17/64"	10	94830A520	0000
	5/16"-24	1/2"	17/64"	10	94830A525	0000
	3/8"-16	9/16"	9/32"	10	94830A530	00000
	3/8"-24	9/16"	9/32"	10	94830A535	00000
	7/16"-20	5/8"	21/64"	5	94830A540	0000


	1/2"-13	3/4"	21/64"	5	94830A545	0000
	1/2"-20	3/4"	21/64"	5	94830A550	0000
	5/8"-11	15/16"	13/32"	1	94830A560	0000
	5/8"-18	15/16"	13/32"	1	94830A565	0000
	3/4"-10	1 1/16"	27/64"	1	94830A570	0000
	3/4"-16	1 1/16"	27/64"	1	94830A436	0000
	7/8"-9	1 1/4"	31/64"	1	94830A120	00000
	1"-8	1 7/16"	37/64"	1	94830A038	0000
	1"-14	1 7/16"	37/64"	1	94830A438	0000
	1 1/4"-12	1 13/16"	49/64"	1	94830A122	00000


	1 1/2"-12	2 3/16"	57/64"	1	94830A123	00000


	Steel



			6-32	5/16"	9/64"	10	94830A124	0000


			8-32	11/32"	3/16"	10	94830A125	0000
			10-24	3/8"	3/16"	10	94830A126	0000
			10-32	3/8"	3/16"	10	94830A127	0000
			1/4"-20	7/16"	7/32"	10	94830A128	0000
			1/4"-28	7/16"	7/32"	10	94830A129	0000
			5/16"-18	1/2"	17/64"	5	94830A130	0000
			5/16"-24	1/2"	17/64"	5	94830A131	0000
			3/8"-16	9/16"	9/32"	5	94830A132	0000
			3/8"-24	9/16"	9/32"	5	94830A133	0000
			1/2"-13	3/4"	21/64"	1	94830A134	0000


			1/2"-20	3/4"	21/64"	1	94830A135	0000
			5/8"-11	15/16"	13/32"	1	94830A136	0000
			5/8"-18	15/16"	13/32"	1	94830A137	0000
			3/4"-10	1 1/16"	27/64"	1	94830A138	0000
			3/4"-16	1 1/16"	27/64"	1	94830A139	0000
			1"-14	1 7/16"	37/64"	1	94830A140	0000
			1 1/8"-12	1 5/8"	41/64"	1	94830A141	00000
			1 1/4"-12	1 13/16"	49/64"	1	94830A142	00000
			1 3/8"-12	1 15/16"	53/64"	1	94830A143	00000
			1 1/2"-12	2 3/16"	57/64"	1	94830A144	00000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

	Wd.	Ht.	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	6-32	5/16"	9/64"	10	94140A100	000000


	8-32	11/32"	3/16"	5	94140A103	00000
	10-24	3/8"	3/16"	5	94140A105	00000
	10-32	3/8"	3/16"	10	94140A107	00000
	1/4"-20	7/16"	7/32"	5	94140A131	00000
	1/4"-28	7/16"	7/32"	5	94140A109	00000
	5/16"-18	1/2"	17/64"	1	94140A139	0000
	5/16"-24	1/2"	17/64"	1	94140A143	0000
	3/8"-16	9/16"	9/32"	1	94140A147	0000
	3/8"-24	9/16"	9/32"	1	94140A151	0000
	1/2"-13	3/4"	21/64"	1	94140A155	00000


	1/2"-20	3/4"	21/64"	1	94140A159	00000
	5/8"-18	15/16"	13/32"	1	94140A162	00000
	3/4"-16	1 1/16"	27/64"	1	94140A163	00000
	7/8"-14	1 1/4"	31/64"	1	94140A164	00000

Thread-Forming Locknuts

Form threads into these nuts for a tight fit that won't loosen under vibration. They are partially threaded, so when you fasten them onto metal screws, the tightening action will cut the rest of the threads. Nuts are not reusable.

Plastic

Nylon 6/6—Slippery and abrasion resistant, these nuts thread on smoothly and stand up to daily wear and tear. Nylon will swell and weaken when exposed to moisture, so it's best for dry environments.

	Wd.	Ht.	Pkg. Qty.		Pkg.
White Nylon 6/6



	2-56	3/16"	1/16"	100	94909A002	000000


	4-40	1/4"	3/32"	100	94909A005	00000
	6-32	5/16"	1/8"	100	94909A007	00000
	8-32	21/64"	1/8"	100	94909A009	00000
	10-24	23/64"	9/64"	100	94909A011	00000
	10-32	23/64"	9/64"	100	94909A022	00000
	1/4"-20	27/64"	15/64"	100	94909A029	00000

Spring-Stop Locknuts

These locknuts withstand heavy vibration similar to distorted-thread nuts, and you can use them over and over. The prongs at the top bend when tightened to create tension for a secure hold. As you remove the locknut, the prongs spring back to their original shape, so you can install the nut again without losing holding power. Also known as Fuji locknuts.

Low-Strength Steel

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

	Wd., mm	Ht., mm	Fastener Strength Grade/Class	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M5 × 0.8 mm	8	4.6	Class 6	10	90508A110	000000


	M6 × 1 mm	10	5.1	Class 6	10	90508A120	00000
	M8 × 1.25 mm	12	7.3	Class 6	10	90508A130	00000
	M10 × 1.25 mm	14	8.5	Class 6	5	90508A150	0000
	M10 × 1.5 mm	17	8.5	Class 6	10	90508A140	00000
	M12 × 1.25 mm	17	10.4	Class 6	1	90508A160	0000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

	Wd., mm	Ht., mm	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	M5 × 0.8 mm	8	4.8	10	90543A110	000000


	M6 × 1 mm	10	5.1	5	90543A120	0000
	M8 × 1.25 mm	13	7.2	5	90543A130	00000
	M10 × 1.5 mm	17	9.2	1	90543A140	0000

Locknuts for use with Cotter Pins

Use these locknuts to secure rotating parts subjected to mild vibration, such as the wheels on carts and hand trucks. They’re not recommended for use on parts exposed to high vibration because the pin can shear under prolonged stress. These nuts are reusable, but you'll need a new cotter pin (not included) with each use.

Medium-Strength Steel

These Grade 5 or Class 8 nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

Steel—Best for dry environments since moisture will cause these nuts to rust.

	Thread Size	Wd.	Ht.	Fastener Strength Grade/Class	For Cotter Pin Dia.	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel



		1/4"-20	7/16"	7/32"	SAE Grade 5	1/16"	—	25	97190A005	000000


		1/4"-28	7/16"	7/32"	SAE Grade 5	1/16"	—	10	97190A110	0000
		5/16"-18	1/2"	17/64"	SAE Grade 5	5/64"	—	25	97190A010	00000
		3/8"-16	9/16"	21/64"	SAE Grade 5	7/64"	—	25	97190A015	00000
		3/8"-24	9/16"	21/64"	SAE Grade 5	7/64"	—	10	97190A120	00000
		7/16"-14	11/16"	3/8"	SAE Grade 5	7/64"	—	25	97190A020	00000
		7/16"-20	11/16"	3/8"	SAE Grade 5	7/64"	—	10	97190A130	0000
		1/2"-13	3/4"	7/16"	SAE Grade 5	7/64"	—	10	97190A025	0000
		1/2"-20	3/4"	7/16"	SAE Grade 5	7/64"	—	10	97190A140	00000
		9/16"-12	7/8"	31/64"	SAE Grade 5	9/64"	—	10	97190A150	00000
		9/16"-18	7/8"	31/64"	SAE Grade 5	9/64"	—	10	97190A160	00000


		5/8"-11	15/16"	35/64"	SAE Grade 5	5/32"	—	10	97190A030	00000
		5/8"-18	15/16"	35/64"	SAE Grade 5	5/32"	—	10	97190A170	00000
		3/4"-10	1 1/8"	41/64"	SAE Grade 5	5/32"	—	5	97190A035	00000
		3/4"-16	1 1/8"	41/64"	SAE Grade 5	5/32"	—	5	97190A180	00000
		7/8"-14	1 5/16"	49/64"	SAE Grade 5	3/16"	—	1	97190A190	0000
		1"-8	1 1/2"	55/64"	SAE Grade 5	3/16"	—	1	97190A040	0000
		1"-14	1 1/2"	55/64"	SAE Grade 5	3/16"	—	1	97190A210	0000
		1 1/4"-7	1 7/8"	1 3/32"	SAE Grade 5	5/16"	—	1	97190A220	0000
		1 1/4"-12	1 7/8"	1 3/32"	SAE Grade 5	5/16"	—	1	97190A230	00000
		M6 × 1 mm	10 mm	7.5 mm	Class 8	1.6 mm	DIN 935	5	93760A212	0000


		M8 × 1.25 mm	13 mm	9.5 mm	Class 8	2 mm	DIN 935	5	93760A222	0000
		M10 × 1.5 mm	17 mm	12 mm	Class 8	2.5 mm	DIN 935	5	93760A233	0000
		M12 × 1.5 mm	19 mm	15 mm	Class 8	3.2 mm	DIN 935	5	93760A126	0000
		M12 × 1.75 mm	19 mm	15 mm	Class 8	3.2 mm	DIN 935	5	93760A317	0000
		M14 × 1.5 mm	22 mm	16 mm	Class 8	3.2 mm	DIN 935	1	93760A127	0000
		M14 × 2 mm	22 mm	16 mm	Class 8	3.2 mm	DIN 935	1	93760A111	0000
		M16 × 1.5 mm	24 mm	19 mm	Class 8	4 mm	DIN 935	10	93760A128	00000
		M16 × 2 mm	24 mm	19 mm	Class 8	4 mm	DIN 935	5	93760A328	00000
		M18 × 2.5 mm	27 mm	21 mm	Class 8	4 mm	DIN 935	1	93760A112	0000
		M20 × 2.5 mm	30 mm	22 mm	Class 8	4 mm	DIN 935	5	93760A337	00000


		M24 × 2 mm	36 mm	27 mm	Class 8	5 mm	DIN 935	1	93760A129	00000
		M24 × 3 mm	36 mm	27 mm	Class 8	5 mm	DIN 935	1	93760A340	0000
		M27 × 3 mm	41 mm	30 mm	Class 8	5 mm	DIN 935	1	93760A113	00000
		M30 × 3.5 mm	46 mm	33 mm	Class 8	6.3 mm	DIN 935	1	93760A114	00000


		Steel



				M12 × 1.5 mm	19 mm	15 mm	Class 8	3.2 mm	DIN 935	10	93760A131	0000


				M14 × 1.5 mm	22 mm	16 mm	Class 8	3.2 mm	DIN 935	1	93760A132	0000
				M14 × 2 mm	22 mm	16 mm	Class 8	3.2 mm	DIN 935	1	93760A115	0000
				M16 × 1.5 mm	24 mm	19 mm	Class 8	4 mm	DIN 935	1	93760A133	0000
				M16 × 2 mm	24 mm	19 mm	Class 8	4 mm	DIN 935	1	93760A116	0000
				M18 × 2.5 mm	27 mm	21 mm	Class 8	4 mm	DIN 935	1	93760A117	0000
				M20 × 2.5 mm	30 mm	22 mm	Class 8	4 mm	DIN 935	1	93760A118	0000
				M24 × 3 mm	36 mm	27 mm	Class 8	5 mm	DIN 935	1	93760A119	0000
				M30 × 3.5 mm	46 mm	33 mm	Class 8	6.3 mm	DIN 935	1	93760A121	00000
				M36 × 3 mm	55 mm	38 mm	Class 8	6.3 mm	DIN 935	1	93760A134	00000
M36 × 4 mm				55 mm	38 mm	Class 8	6.3 mm	DIN 935	1	93760A122	00000


M42 × 4.5 mm	65 mm			46 mm	Class 8	8 mm	DIN 935	1	93760A123	00000
M48 × 5 mm	75 mm			50 mm	Class 8	8 mm	DIN 935	1	93760A124	00000
M56 × 5.5 mm	85 mm			57 mm	Class 8	8 mm	DIN 935	1	93760A125	00000

Low-Strength Steel

Image of ProductInUse. Front orientation. Locknuts. Locknuts for use with Cotter Pins.

Image of Product. Front orientation. Locknuts. Locknuts for use with Cotter Pins.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

Steel—Best for dry environments since moisture will cause these nuts to rust.

	Wd.	Ht.	For Cotter Pin Dia.	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	1/4"-20	7/16"	7/32"	1/16"	50	95030A110	000000


	1/4"-28	7/16"	7/32"	1/16"	50	95030A120	00000
	5/16"-18	1/2"	17/64"	5/64"	25	95030A130	0000
	5/16"-24	1/2"	17/64"	5/64"	25	95030A140	0000
	3/8"-16	9/16"	21/64"	7/64"	25	95030A150	00000
	3/8"-24	9/16"	21/64"	7/64"	25	95030A160	00000
	7/16"-14	11/16"	3/8"	3/32"	25	95030A170	00000
	7/16"-20	11/16"	3/8"	3/32"	25	95030A180	00000
	1/2"-13	3/4"	7/16"	1/8"	25	95030A190	00000
	1/2"-20	3/4"	7/16"	1/8"	25	95030A210	00000
	9/16"-12	7/8"	31/64"	7/64"	10	95030A220	00000


	9/16"-18	7/8"	31/64"	7/64"	5	95030A230	0000
	5/8"-11	15/16"	35/64"	5/32"	10	95030A240	0000
	5/8"-18	15/16"	35/64"	5/32"	10	95030A250	0000
	3/4"-10	1 1/8"	21/32"	5/32"	10	95030A260	00000
	3/4"-16	1 1/8"	21/32"	5/32"	10	95030A270	00000
	7/8"-9	1 5/16"	3/4"	5/32"	5	95030A280	00000
	7/8"-14	1 5/16"	3/4"	5/32"	5	95030A290	0000
	1"-8	1 1/2"	55/64"	3/16"	5	95030A310	00000
	1"-14	1 1/2"	55/64"	3/16"	5	95030A320	00000
	1 1/4"-7	1 7/8"	1 3/32"	9/32"	1	95030A350	0000


	1 1/4"-12	1 7/8"	1 1/16"	9/32"	1	95030A360	0000
	1 1/2"-6	2 1/4"	1 5/16"	5/16"	1	95030A370	00000
	1 1/2"-12	2 1/4"	1 5/16"	5/16"	1	95030A380	00000
	1 3/4"-5	2 5/8"	1 1/2"	3/8"	1	95030A390	00000
	1 3/4"-12	2 5/8"	1 1/2"	3/8"	1	95030A410	00000
	2"-4 1/2	3"	1 23/32"	3/8"	1	95030A420	00000
	2"-12	3"	1 23/32"	3/8"	1	95030A430	00000


	Black-Oxide Steel



			1 1/2"-12	2 1/4"	1 9/32"	5/16"	1	95030A610	00000


			Steel



					1/4"-20	7/16"	7/32"	1/16"	25	95030A510	0000


					5/16"-24	1/2"	17/64"	5/64"	25	95030A520	0000
					1"-14	1 1/2"	55/64"	3/16"	1	95030A530	0000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

	Wd.	Ht.	For Cotter Pin Dia.	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	10-32	3/8"	1/4"	3/64"	5	91853A510	000000


	1/4"-20	7/16"	9/32"	1/16"	5	91853A029	0000
	1/4"-28	7/16"	9/32"	1/16"	5	91853A515	0000
	5/16"-18	1/2"	21/64"	5/64"	5	91853A030	00000
	5/16"-24	1/2"	21/64"	5/64"	5	91853A520	00000
	3/8"-16	9/16"	13/32"	3/32"	1	91853A031	0000
	3/8"-24	9/16"	13/32"	3/32"	1	91853A525	0000
	1/2"-13	3/4"	9/16"	1/8"	1	91853A033	0000
	1/2"-20	3/4"	9/16"	1/8"	1	91853A535	0000
	5/8"-11	15/16"	23/32"	5/32"	1	91853A035	0000
	5/8"-18	15/16"	23/32"	5/32"	1	91853A545	0000


	3/4"-10	1 1/8"	13/16"	5/32"	1	91853A036	0000
	3/4"-16	1 1/8"	13/16"	5/32"	1	91853A550	0000
	7/8"-9	1 5/16"	29/32"	5/32"	1	91853A037	00000
	1"-8	1 1/2"	1"	3/16"	1	91853A038	00000
	1 1/4"-7	1 7/8"	1 1/4"	7/32"	1	91853A040	00000
	1 1/2"-6	2 1/4"	1 1/2"	1/4"	1	91853A041	00000

Locknuts with Spring-Lock Washer

The curved, spring-like washer grips surfaces more tightly than tooth-lock washers for better vibration resistance. These locknuts also install just as quickly since you can twist them into place by hand. Once the nut is against your material, tighten it down with a wrench or socket. The washer's smooth edges won't mar the surface like teeth can. As long as the washer stays intact, you can reuse these locknuts.

Medium-Strength Steel

These Grade 5 or Class 8 nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

	Wd., mm	Ht., mm	Fastener Strength Grade/Class	Washer OD, mm	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M3 × 0.5 mm	5.5	3.8	Class 8	8	50	91270A250	000000


	M4 × 0.7 mm	7	4.2	Class 8	10	100	91270A310	00000
	M5 × 0.8 mm	8	5.3	Class 8	12	100	91270A320	00000
	M6 × 1 mm	10	6.6	Class 8	14	50	91270A330	0000
	M8 × 1.25 mm	13	8.8	Class 8	18	50	91270A340	00000
	M10 × 1.5 mm	17	10.7	Class 8	22	10	91270A350	00000
	M12 × 1.75 mm	19	13.8	Class 8	25.5	25	91270A360	00000


	Black-Oxide Steel



			M3 × 0.5 mm	5.5	3.5	Class 8	10	50	91270A260	00000


			M4 × 0.7 mm	7	4.2	Class 8	10	50	91270A270	00000
			M5 × 0.8 mm	8	5.3	Class 8	12	50	91270A280	00000
			M6 × 1 mm	10	6.6	Class 8	14	25	91270A290	0000

Low-Strength Steel

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

	Wd.	Ht.	Washer OD	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	4-40	1/4"	9/64"	0.328"	25	95170A350	000000


	6-32	5/16"	9/64"	0.328"	25	95170A355	00000
	8-32	11/32"	3/16"	0.375"	50	95170A360	00000
	10-32	3/8"	3/16"	0.406"	25	95170A370	00000
	1/4"-20	7/16"	3/16"	0.5"	10	95170A390	00000


	Black-Oxide Steel



			4-40	1/4"	9/64"	0.328"	50	92087A110	00000


			6-32	5/16"	9/64"	0.328"	25	92087A120	00000
			8-32	11/32"	3/16"	0.375"	10	92087A130	00000
			10-32	3/8"	3/16"	0.406"	10	92087A140	0000
			1/4"-20	7/16"	3/16"	0.5"	10	92087A150	00000

Steel-Insert Locknuts for Extreme Vibration

The most secure hold of all the locknuts we offer. The tab on the insert stops the nut from rotating, even under extreme vibration. These locknuts are ideal for equipment with constant motion or jarring starts and stops, including conveyors, shakers, and compactors. In fact, they're so secure that they're even used to fasten components on roller coasters. These locknuts are also reusable, but their holding power decreases after the first use, so you should use a new nut for the strongest possible hold.

Medium-Strength Steel

These Grade 5 or Class 8 nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Steel—Best for dry environments since moisture will cause these nuts to rust.

	Wd.	Ht.	Fastener Strength Grade/Class		Each
Steel



	1/2"-13	3/4"	1/2"	SAE Grade 5	90619A410	00000


	5/8"-11	15/16"	5/8"	SAE Grade 5	90619A415	0000
	3/4"-10	1 1/8"	3/4"	SAE Grade 5	90619A425	0000
	3/4"-16	1 1/8"	3/4"	SAE Grade 5	90619A430	0000
	7/8"-9	1 5/16"	7/8"	SAE Grade 5	90619A435	0000
	7/8"-14	1 5/16"	7/8"	SAE Grade 5	90619A440	00000
	1"-8	1 1/2"	1"	SAE Grade 5	90619A445	00000
	1 1/4"-7	1 7/8"	1 1/4"	SAE Grade 5	90619A465	00000
	1 1/2"-6	2 1/4"	1 1/2"	SAE Grade 5	90619A475	00000
	M12 × 1.75 mm	19 mm	11.7 mm	Class 8	93520A205	0000
	M16 × 2 mm	24 mm	14.6 mm	Class 8	93520A209	0000


	M20 × 2.5 mm	31.75 mm	22.23 mm	Class 8	93520A214	0000
	M22 × 2.5 mm	32 mm	20 mm	Class 8	93520A217	00000
	M24 × 3 mm	36 mm	21.5 mm	Class 8	93520A221	00000
	M27 × 3 mm	41 mm	24.4 mm	Class 8	93520A225	00000
	M30 × 3.5 mm	46 mm	27 mm	Class 8	93520A229	00000

Heavy-Profile Steel-Insert Locknuts for Extreme Vibration

Nearly 10% wider and taller than standard steel-insert locknuts, these handle heavier loads by distributing them over a larger area. They also have the most secure hold of all the heavy-profile locknuts we offer. The tab on the insert stops the nut from rotating, even under extreme vibration. These locknuts are ideal for equipment with constant motion or jarring starts and stops, including conveyors, shakers, and compactors. In fact, they're so secure that they're even used to fasten components on roller coasters. These locknuts are also reusable, but their holding power decreases after the first use, so you should use a new nut for the strongest possible hold.

High-Strength Steel

Steel—Best for dry environments since moisture will cause these nuts to rust.

	Wd.	Ht.	Fastener Strength Grade/Class		Each
Zinc-Yellow-Chromate-Plated Steel



	1/2"-13	7/8"	19/32"	SAE Grade 8	94835A110	00000


	5/8"-11	1 1/16"	47/64"	SAE Grade 8	94835A120	0000
	3/4"-10	1 1/4"	57/64"	SAE Grade 8	94835A130	00000
	1"-8	1 5/8"	1 11/64"	SAE Grade 8	94835A150	00000


	Steel



			3/8"-16	11/16"	13/32"	SAE Grade 8	90621A042	0000


			1/2"-13	7/8"	37/64"	SAE Grade 8	90621A043	0000
			5/8"-11	1 1/16"	47/64"	SAE Grade 8	90621A045	0000
			3/4"-10	1 1/4"	7/8"	SAE Grade 8	90621A047	0000
			7/8"-9	1 7/16"	1 1/32"	SAE Grade 8	90621A710	00000
			1"-8	1 5/8"	1 11/64"	SAE Grade 8	90621A048	00000
			1 1/8"-7	1 13/16"	1 17/64"	SAE Grade 8	90621A039	00000
			1 1/4"-7	2"	1 13/32"	SAE Grade 8	90621A060	00000
			1 1/2"-6	2 3/8"	1 11/16"	SAE Grade 8	90621A065	00000
			1 3/4"-5	2 3/4"	2 1/32"	SAE Grade 8	90621A070	000000

Medium-Strength Steel

These Grade 5 or Class 8 nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Steel—Best for dry environments since moisture will cause these nuts to rust.

	Wd.	Ht.	Fastener Strength Grade/Class		Each
Steel



	1/2"-13	7/8"	9/16"	SAE Grade 5	90621A033	00000


	5/8"-11	1 1/16"	45/64"	SAE Grade 5	90621A035	0000
	3/4"-10	1 1/4"	27/32"	SAE Grade 5	90621A036	0000
	7/8"-9	1 7/16"	63/64"	SAE Grade 5	90621A037	0000
	1"-8	1 5/8"	1 1/8"	SAE Grade 5	90621A038	00000

Heavy-Profile Flex-Top Locknuts for Heavy Vibration

About 10% wider and taller than standard flex-top nuts, these handle heavier loads by distributing them over a larger area. The top section expands to grip the screw on all sides for a stronger hold than both nylon-insert and distorted-thread locknuts. As a result, they're suitable for use in equipment with constant, vigorous vibration, such as engines. These locknuts are reusable a handful of times, but the holding power decreases with each use.

Steel

These locknuts have equivalent strength to Grade 8 and Class 10 steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

	Wd.	Ht.	Pkg. Qty.		Pkg.
Cadmium-Plated Steel



	1/4"-20	1/2"	19/64"	10	94827A110	000000


	5/16"-18	9/16"	21/64"	10	94827A120	00000
	3/8"-16	5/8"	25/64"	10	94827A130	00000
	1/2"-13	13/16"	1/2"	5	94827A150	00000
	5/8"-11	1"	41/64"	1	94827A160	0000
	3/4"-10	1 1/8"	49/64"	1	94827A036	0000
	7/8"-9	1 5/16"	57/64"	1	94827A037	00000
	1"-8	1 1/2"	1 1/64"	1	94827A038	00000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

	Wd.	Ht.	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	1/4"-20	1/2"	19/64"	1	95070A210	000000


	5/16"-18	9/16"	21/64"	1	95070A310	00000
	3/8"-16	5/8"	25/64"	1	95070A410	00000
	7/16"-14	3/4"	29/64"	1	95070A510	00000
	1/2"-13	13/16"	1/2"	1	95070A610	00000

Thin-Heavy-Profile Flex-Top Locknuts for Heavy Vibration

About two-thirds the height of standard flex-top nuts and 10% wider, these fit in spaces with low clearance and handle heavier loads by distributing them over a larger area. Because of the thin profile, you can also use them as jam nuts by threading them against a hex nut to hold it in place. The top section expands to grip the screw on all sides for a stronger hold than both nylon-insert and distorted-thread locknuts. As a result, they're suitable for use in equipment with constant, vigorous vibration, such as engines. These locknuts are reusable a handful of times, but the holding power decreases with each use.

Steel

These locknuts have equivalent strength to Grade 8 and Class 10 steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

	Wd.	Ht.	Pkg. Qty.		Pkg.
Cadmium-Plated Steel



	1/4"-20	1/2"	7/32"	25	94828A410	000000


	5/16"-18	9/16"	17/64"	10	94828A420	00000
	3/8"-16	5/8"	9/32"	10	94828A425	00000
	7/16"-14	3/4"	21/64"	1	94828A430	0000
	1/2"-13	13/16"	21/64"	5	94828A435	00000
	5/8"-11	1"	13/32"	1	94828A440	0000
	3/4"-10	1 1/8"	27/64"	1	94828A036	00000
	7/8"-9	1 5/16"	31/64"	1	94828A037	00000
	1"-8	1 1/2"	37/64"	1	94828A038	00000

Two-Piece-Clamp Locknuts for Extreme Vibration

Similar to steel-insert locknuts, these two-piece nuts withstand extreme vibration but are easier to install. Since the two pieces spin freely by hand until you tighten them together with a wrench, they're perfect for extra long screws and threaded rods. You can reuse them a handful of times, but their hold will decrease with repeated use. Also known as drake-style locknuts.

Height includes both nuts once assembled.

Steel

These locknuts have equivalent strength to Grade 5 and Class 8 steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Steel—Best for dry environments since moisture will cause these nuts to rust.

	Wd.	Ht.		Each
Steel



	1/4"-28	7/16"	3/8"	90623A150	000000


	5/16"-24	1/2"	29/64"	90623A160	00000
	3/8"-24	9/16"	33/64"	90623A170	00000
	7/16"-20	11/16"	19/32"	90623A180	00000
	1/2"-20	3/4"	41/64"	90623A190	00000
	5/8"-18	15/16"	55/64"	90623A200	00000
	3/4"-16	1 1/8"	1 3/64"	90623A210	00000
	7/8"-14	1 5/16"	1 13/64"	90623A220	00000

Serrated Locknuts

Since these nuts twist on by hand and don't require much torque, they're the easiest locknuts to install. The serrated edge grips surfaces to secure equipment that experiences mild vibration, such as panel covers and small electric motors. You can reuse these locknuts over and over again, but the serrations may mar your surface.

Low-Strength Steel

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

	Wd.	Ht.	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	8-32	11/32"	1/8"	50	91762A110	000000


	10-24	3/8"	1/8"	50	91762A120	00000
	10-32	3/8"	1/8"	50	91762A130	00000
	1/4"-20	7/16"	3/16"	50	91762A140	00000
	5/16"-18	1/2"	17/64"	50	91762A150	00000
	3/8"-16	9/16"	21/64"	50	91762A160	00000
	1/2"-13	3/4"	7/16"	25	91762A170	00000

Thin-Profile Steel-Insert Locknuts for Extreme Vibration

About two-thirds the height of standard steel-insert locknuts, these fit in spaces with low clearance and offer the most secure hold of all our thin-profile locknuts. You can also use them as jam nuts by threading them against a hex nut to hold it in place. The tab on the insert stops the nut from rotating, even under extreme vibration. These locknuts are ideal for equipment with constant motion or jarring starts and stops, including conveyors, shakers, and compactors. In fact, they're so secure, they can even fasten components on roller-coasters. You can reuse them once or twice, but their holding power decreases after the first use, so you should use a new locknut for the strongest possible hold.

High-Strength Steel

Steel—Best for dry environments since moisture will cause these nuts to rust.

	Wd.	Ht.	Fastener Strength Grade/Class		Each
Steel



	1/2"-13	3/4"	13/32"	SAE Grade 8	90619A021	00000


	5/8"-11	15/16"	1/2"	SAE Grade 8	90619A151	0000
	3/4"-10	1 1/8"	9/16"	SAE Grade 8	90619A167	0000
	3/4"-16	1 1/8"	9/16"	SAE Grade 8	90619A036	00000
	7/8"-9	1 5/16"	21/32"	SAE Grade 8	90619A175	00000
	7/8"-14	1 5/16"	19/32"	SAE Grade 8	90619A037	00000
	1"-8	1 1/2"	3/4"	SAE Grade 8	90619A189	00000
	1 1/4"-7	1 7/8"	31/32"	SAE Grade 8	90619A213	00000
	1 1/2"-6	2 1/4"	1 1/16"	SAE Grade 8	90619A228	00000

Left-Hand-Thread Center-Lock Distorted-Thread Locknuts

Secure parts that rotate counterclockwise, such as the propeller on a mixer. Also known as reversible locknuts, these thread on from either side, so you don't have to worry about fastening them incorrectly and damaging your screw. The irregularly shaped threads in the middle grip the screw for a stronger hold than nylon-insert locknuts. Although the threads prevent the nut from backing out due to vibration, they also increase the effort to install and remove. To get these nuts off, you may need special tools, such as an impact wrench or propane torch. Nuts are not reusable.

High-Strength Steel

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

	Wd.	Ht.	Fastener Strength Grade/Class	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	1/4"-20	7/16"	7/32"	SAE Grade 8	25	90392A028	000000


	3/8"-16	9/16"	21/64"	SAE Grade 8	10	90392A039	0000
	1/2"-13	3/4"	7/16"	SAE Grade 8	10	90392A050	00000
	5/8"-11	15/16"	35/64"	SAE Grade 8	5	90392A061	00000
	3/4"-10	1 1/8"	41/64"	SAE Grade 8	5	90392A067	00000

Narrow-Profile Locknuts with External-Tooth Lock Washer

Since they're about 20% narrower, these locknuts fit in tight spaces where standard-profile nuts won't fit. They combine a hex nut with a free-spinning lock washer, so you can twist them into place by hand and save on assembly time. Once the nut is against your material surface, tighten it down with a wrench or socket to get the teeth to bite. Although these nuts install more quickly than nylon-insert locknuts, they don't hold up as well against vibration and can mar your material. As long as the washer stays intact, you can reuse them. Also known as Keps and K-lock nuts.

Low-Strength Steel

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

	Wd.	Ht.	Washer OD	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	6-32	1/4"	1/8"	0.281"	100	90413A101	000000


	8-32	5/16"	9/64"	0.344"	100	90413A102	00000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

	Wd.	Ht.	Washer OD	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	6-32	1/4"	1/8"	0.287"	100	96278A113	000000

Nylon-Insert Locknut Assortments

With a range of sizes on hand, you can use these assortments to fasten a variety of parts. The nylon insert grips the screw to prevent loosening from moderate vibration without damaging threads. However, the insert may become brittle if exposed to high temperatures. These locknuts are reusable a handful of times, but the holding power decreases with each use.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

	Locknuts Included	Container Type		Each
Zinc-Plated Steel



	550	4-40 (100 Pieces) 6-32 (100 Pieces) 8-32 (100 Pieces) 10-24 (100 Pieces) 10-32 (100 Pieces) 1/4"-20 (50 Pieces)	Plastic Box	93949A600	000000


	18-8 Stainless Steel



			550	4-40 (100 Pieces) 6-32 (100 Pieces) 8-32 (100 Pieces) 10-24 (100 Pieces) 10-32 (100 Pieces) 1/4"-20 (50 Pieces)	Plastic Box	93949A300	00000

Assortments of Locknuts with External-Tooth Lock Washer

With a range of sizes on hand, you can use these assortments to fasten a variety of parts. These locknuts combine a hex nut with a free-spinning lock washer, so you can twist them into place by hand and save on assembly time. Once the nut is against your material surface, tighten it down with a wrench or socket to get the teeth to bite. Although these nuts install more quickly than nylon-insert locknuts, they don't hold up as well against vibration and can mar your material. As long as the washer stays intact, you can reuse them. Also known as Keps and K-lock nuts.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

	Locknuts Included	Container Type		Each
Zinc-Plated Steel



	600	4-40 (100 Pieces) 6-32 (100 Pieces) 8-32 (100 Pieces) 10-24 (100 Pieces) 10-32 (100 Pieces) 1/4"-20 (100 Pieces)	Plastic Box	90740A106	000000


	18-8 Stainless Steel



			600	4-40 (100 Pieces) 6-32 (100 Pieces) 8-32 (100 Pieces) 10-24 (100 Pieces) 10-32 (100 Pieces) 1/4"-20 (100 Pieces)	Plastic Box	90625A500	00000

Nylon-Insert Locknuts

Thin-Profile Nylon-Insert Locknuts

Top-Lock Distorted-Thread Locknuts

Mil. Spec. Nylon-Insert Locknuts

Center-Lock Distorted-Thread Locknuts

Flex-Top Locknuts for Heavy Vibration

Locknuts with External-Tooth Lock Washer

Mil. Spec. Thin-Profile Nylon-Insert Locknuts

Mil. Spec. Flex-Top Locknuts for Heavy Vibration

Thin-Heavy-Profile Nylon-Insert Locknuts

Heavy-Profile Nylon-Insert Locknuts

High-Profile Nylon-Insert Locknuts

Compatible Products for This Locknut

Thin-Profile Flex-Top Locknuts for Heavy Vibration

Thread-Forming Locknuts

Spring-Stop Locknuts

Locknuts for use with Cotter Pins

Locknuts with Spring-Lock Washer

Steel-Insert Locknuts for Extreme Vibration

Heavy-Profile Steel-Insert Locknuts for Extreme Vibration

Heavy-Profile Flex-Top Locknuts for Heavy Vibration

Thin-Heavy-Profile Flex-Top Locknuts for Heavy Vibration

Two-Piece-Clamp Locknuts for Extreme Vibration

Serrated Locknuts

Thin-Profile Steel-Insert Locknuts for Extreme Vibration

Left-Hand-Thread Center-Lock Distorted-Thread Locknuts

Narrow-Profile Locknuts with External-Tooth Lock Washer

Nylon-Insert Locknut Assortments

Assortments of Locknuts with External-Tooth Lock Washer