Stover Locknuts | McMaster-Carr

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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

Image of Product. Front orientation. Locknuts. Top-Lock Distorted-Thread Locknuts.

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	Certificate Type	Pkg. Qty.		Pkg.
Cadmium-Plated Steel



	1/4"-20	7/16"	19/64"	SAE Grade 9	Material Certificate	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	Material Certificate	1	93591A600	0000
	3/4"-10	1 1/8"	25/32"	SAE Grade 9	—	1	93591A700	0000

High-Strength Steel

Rated Grade 8 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-Phosphate-Coated Steel—The dark coating creates both a finished appearance and a barrier against rust that withstands occasional exposure to moisture.

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



		M6 × 1 mm	10	6	Class 10	Material Certificate	100	99183A250	000000


		M8 × 1.25 mm	13	8	Class 10	—	50	99183A260	00000
		M8 × 1 mm	13	8	Class 10	—	10	99183A790	0000
		M10 × 1.5 mm	17	10	Class 10	Material Certificate	25	99183A270	00000
		M10 × 1.25 mm	17	10	Class 10	—	10	99183A480	0000
		M12 × 1.75 mm	19	12	Class 10	Material Certificate	10	99183A280	0000
		M12 × 1.5 mm	19	12	Class 10	Material Certificate	5	99183A810	00000
		M12 × 1.25 mm	19	12	Class 10	—	5	99183A490	00000
		M14 × 2 mm	22	14	Class 10	—	10	99183A290	0000
		M14 × 1.5 mm	22	14	Class 10	—	5	99183A820	00000
		M16 × 2 mm	24	16	Class 10	—	10	99183A310	00000


		M16 × 1.5 mm	24	16	Class 10	—	1	99183A830	0000
		M18 × 2.5 mm	27	18	Class 10	—	5	99183A320	00000
		M20 × 2.5 mm	30	20	Class 10	—	5	99183A330	00000
		M24 × 3 mm	36	24	Class 10	—	1	99183A340	0000


		Zinc-Plated Steel



				M5 × 0.8 mm	8	5.1	Class 10	Material Certificate	100	99183A110	0000


				M6 × 1 mm	10	6	Class 10	Material Certificate	100	99183A120	00000
				M8 × 1.25 mm	13	8	Class 10	—	50	99183A130	00000
				M8 × 1 mm	13	8	Class 10	Material Certificate	50	99183A360	00000
				M10 × 1.5 mm	17	10	Class 10	—	25	99183A140	00000
				M10 × 1.25 mm	17	10	Class 10	—	10	99183A750	00000
				M10 × 1 mm	17	10	Class 10	—	25	99183A370	00000
				M12 × 1.75 mm	19	12	Class 10	—	25	99183A150	00000
				M12 × 1.5 mm	19	12	Class 10	—	10	99183A760	00000
				M12 × 1.25 mm	19	12	Class 10	Material Certificate	25	99183A380	00000
				M14 × 2 mm	22	14	Class 10	—	10	99183A160	0000


				M14 × 1.5 mm	22	14	Class 10	—	10	99183A390	0000
				M16 × 2 mm	24	16	Class 10	Material Certificate	10	99183A170	0000
				M16 × 1.5 mm	24	16	Class 10	—	10	99183A410	00000
				M18 × 2.5 mm	27	18	Class 10	Material Certificate	5	99183A180	0000
				M18 × 1.5 mm	27	18	Class 10	—	5	99183A420	00000
				M20 × 2.5 mm	30	20	Class 10	—	5	99183A190	00000
				M20 × 1.5 mm	30	20	Class 10	—	5	99183A430	00000
				M22 × 2.5 mm	32	22	Class 10	—	5	99183A210	00000
				M22 × 1.5 mm	32	22	Class 10	—	5	99183A440	00000
				M24 × 3 mm	36	24	Class 10	—	1	99183A220	0000


				M24 × 1.5 mm	36	24	Class 10	Material Certificate	1	99183A450	0000
				M27 × 3 mm	41	27	Class 10	Material Certificate	1	99183A230	0000
				M30 × 3.5 mm	46	30	Class 10	—	1	99183A240	0000
				M30 × 2 mm	46	30	Class 10	—	1	99183A460	0000


				Black-Phosphate-Coated Steel



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


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


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

Medium-Strength Steel

These Grade 5, Grade C, 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-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.

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	Certificate Type	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
		M36 × 4 mm	55 mm	36 mm	Class 8	Material Certificate	1	93795A321	00000


		Zinc-Plated Steel



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


				1/4"-20	7/16"	1/4"	SAE Grade 5	—	100	95065A150	00000
				1/4"-28	7/16"	7/32"	ASTM Grade C	—	100	92501A522	00000
				1/4"-28	7/16"	1/4"	SAE Grade 5	—	50	95065A104	00000
				5/16"-18	1/2"	17/64"	ASTM Grade C	—	100	92501A523	00000
				5/16"-18	1/2"	19/64"	SAE Grade 5	Material Certificate	50	95065A160	00000
				5/16"-24	1/2"	17/64"	ASTM Grade C	—	100	92501A524	00000
				5/16"-24	1/2"	19/64"	SAE Grade 5	—	50	95065A105	00000
				3/8"-16	9/16"	21/64"	ASTM Grade C	—	100	92501A525	00000
				3/8"-16	9/16"	3/8"	SAE Grade 5	—	50	95065A171	00000
				3/8"-24	9/16"	21/64"	ASTM Grade C	—	100	92501A526	00000


				3/8"-24	9/16"	3/8"	SAE Grade 5	—	50	95065A106	00000
				7/16"-14	11/16"	3/8"	ASTM Grade C	—	50	92501A527	00000
				7/16"-14	11/16"	27/64"	SAE Grade 5	—	50	95065A101	00000
				7/16"-20	11/16"	3/8"	ASTM Grade C	—	50	92501A528	00000
				7/16"-20	11/16"	27/64"	SAE Grade 5	—	25	95065A107	00000
				1/2"-13	3/4"	7/16"	ASTM Grade C	—	50	92501A529	00000
				1/2"-13	3/4"	1/2"	SAE Grade 5	Material Certificate	25	95065A191	00000
				1/2"-20	3/4"	7/16"	ASTM Grade C	—	50	92501A530	00000
				1/2"-20	3/4"	1/2"	SAE Grade 5	—	10	95065A108	0000
				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"-11	15/16"	5/8"	SAE Grade 5	Material Certificate	10	95065A220	00000
5/8"-18				15/16"	35/64"	ASTM Grade C	—	25	92501A534	00000
5/8"-18	15/16"			5/8"	SAE Grade 5	—	10	95065A109	0000
3/4"-10	1 1/8"			41/64"	ASTM Grade C	—	10	92501A535	0000
3/4"-10	1 1/8"			3/4"	SAE Grade 5	—	10	95065A230	00000
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"-9	1 5/16"			13/16"	SAE Grade 5	—	5	95065A102	00000


7/8"-14	1 5/16"			3/4"	ASTM Grade C	—	10	92501A538	00000
7/8"-14	1 5/16"			13/16"	SAE Grade 5	—	5	95065A111	00000
1"-8	1 1/2"			55/64"	ASTM Grade C	—	5	92501A539	00000
1"-8	1 1/2"			15/16"	SAE Grade 5	—	5	95065A103	00000
1"-14	1 1/2"			55/64"	ASTM Grade C	—	5	92501A540	00000
1"-14	1 1/2"			15/16"	SAE Grade 5	—	1	95065A112	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	Material Certificate	1	92501A545	00000
1 1/2"-12	2 1/4"			1 5/16"	ASTM Grade C	—	1	92501A546	0000
M3 × 0.5 mm	5.5 mm			3.7 mm	Class 8	—	50	93795A200	00000
M4 × 0.7 mm	7 mm			4.2 mm	Class 8	Material Certificate	100	93795A205	00000
M5 × 0.8 mm	8 mm			5.1 mm	Class 8	—	100	93795A210	00000
M6 × 1 mm	10 mm			6 mm	Class 8	—	100	93795A220	0000
M8 × 1.25 mm	13 mm			8 mm	Class 8	—	50	93795A230	0000
M10 × 1.5 mm	17 mm			10 mm	Class 8	—	25	93795A240	0000
M10 × 1.25 mm	17 mm			10 mm	Class 8	—	25	93795A333	0000
M12 × 1.75 mm	19 mm			12 mm	Class 8	—	25	93795A250	00000

M12 × 1.5 mm	19 mm	12 mm	Class 8	—	10	93795A334	00000
M12 × 1.25 mm	19 mm	12 mm	Class 8	—	25	93795A337	00000
M14 × 2 mm	22 mm	14 mm	Class 8	—	10	93795A257	00000
M14 × 1.5 mm	22 mm	14 mm	Class 8	—	10	93795A335	00000
M16 × 2 mm	24 mm	16 mm	Class 8	—	10	93795A260	00000
M16 × 1.5 mm	24 mm	16 mm	Class 8	—	5	93795A336	00000
M18 × 2.5 mm	27 mm	18 mm	Class 8	—	5	93795A265	00000
M18 × 1.5 mm	27 mm	18 mm	Class 8	—	1	93795A338	0000
M20 × 2.5 mm	30 mm	20 mm	Class 8	—	5	93795A270	00000
M20 × 1.5 mm	30 mm	20 mm	Class 8	—	1	93795A339	0000
M24 × 3 mm	36 mm	24 mm	Class 8	—	1	93795A280	0000
M24 × 1.5 mm	36 mm	24 mm	Class 8	—	1	93795A343	0000
M27 × 3 mm	41 mm	27 mm	Class 8	—	1	93795A311	0000
M30 × 3.5 mm	46 mm	30 mm	Class 8	—	1	93795A312	0000

Black-Oxide Steel



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


		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"	17/64"	ASTM Grade C	—	50	99291A340	00000
		5/16"-18	1/2"	19/64"	SAE Grade 5	—	50	90673A102	00000
		5/16"-24	1/2"	17/64"	ASTM Grade C	—	50	99291A450	00000
		5/16"-24	1/2"	19/64"	SAE Grade 5	—	50	90673A112	00000
		3/8"-16	9/16"	21/64"	ASTM Grade C	Material Certificate	25	99291A350	00000
		3/8"-16	9/16"	3/8"	SAE Grade 5	—	25	90673A103	00000
		3/8"-24	9/16"	21/64"	ASTM Grade C	—	25	99291A460	00000
		3/8"-24	9/16"	3/8"	SAE Grade 5	—	50	90673A113	00000


		7/16"-14	11/16"	3/8"	ASTM Grade C	—	10	99291A360	0000
		7/16"-14	11/16"	27/64"	SAE Grade 5	—	25	90673A107	00000
		7/16"-20	11/16"	3/8"	ASTM Grade C	—	10	99291A470	0000
		7/16"-20	11/16"	27/64"	SAE Grade 5	—	25	90673A114	00000
		1/2"-13	3/4"	7/16"	ASTM Grade C	Material Certificate	10	99291A370	00000
		1/2"-13	3/4"	1/2"	SAE Grade 5	—	10	90673A104	0000
		1/2"-20	3/4"	7/16"	ASTM Grade C	—	10	99291A480	00000
		1/2"-20	3/4"	1/2"	SAE Grade 5	—	10	90673A115	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	Material Certificate	5	99291A390	00000
		5/8"-11	15/16"	5/8"	SAE Grade 5	—	5	90673A105	00000
		5/8"-18	15/16"	35/64"	ASTM Grade C	Material Certificate	5	99291A510	00000
		5/8"-18	15/16"	5/8"	SAE Grade 5	—	10	90673A116	00000
		3/4"-10	1 1/8"	41/64"	ASTM Grade C	Material Certificate	5	99291A410	00000
		3/4"-10	1 1/8"	3/4"	SAE Grade 5	—	5	90673A106	00000
		3/4"-16	1 1/8"	41/64"	ASTM Grade C	Material Certificate	5	99291A520	00000
		7/8"-9	1 5/16"	3/4"	ASTM Grade C	—	1	99291A420	0000
		7/8"-9	1 5/16"	13/16"	SAE Grade 5	—	1	90673A108	00000
		7/8"-14	1 5/16"	3/4"	ASTM Grade C	—	1	99291A530	0000


		7/8"-14	1 5/16"	13/16"	SAE Grade 5	—	1	90673A117	0000
		1"-8	1 1/2"	55/64"	ASTM Grade C	—	1	99291A430	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


		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	Material Certificate	5	99291A690	00000
				1/2"-13	3/4"	7/16"	ASTM Grade C	Material Certificate	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	Material Certificate	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	Material Certificate	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	Material Certificate	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

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.

	Wd.	Ht.	Fastener Strength Grade/Class	Certificate Type	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	Material Certificate	100	91837A011	0000
	10-24	3/8"	1/8"	SAE Grade 2	—	100	91837A014	00000
	10-32	3/8"	1/8"	SAE Grade 2	Material Certificate	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.	Certificate Type	Pkg. Qty.		Pkg.
18-8 Stainless Steel



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


	8-32	11/32"	1/8"	—	50	90045A013	00000
	10-24	3/8"	1/8"	—	50	90045A016	00000
	10-32	3/8"	1/8"	—	50	90045A018	00000
	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	00000
	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	Material Certificate	25	90045A111	00000
	M5 × 0.8 mm	8 mm	4 mm	Material Certificate	25	90045A112	00000


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

Distorted-Thread Flange Nuts

The strongest hold of all the flange nuts we offer, these have irregularly shaped threads that grip the screw to resist loosening. The threads prevent the nut from backing out due to high vibration, but 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, so they are not reusable. Nuts have a flange that distributes pressure evenly across the mounting surface without the need for a separate washer. They are ideal for securing screws in oversized or irregularly shaped holes since the flange covers a larger area than standard nuts. Also known as collar nuts.

Corrosion-Resistant Stainless Steel

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

				Flange
	Thread Size	Wd.	Ht.	Dia.	Thk.	Certificate Type	Pkg. Qty.		Pkg.
18-8 Stainless Steel



		6-32	5/16"	11/64"	0.422"	0.02"	—	5	90423A110	00000


		8-32	11/32"	13/64"	0.469"	0.02"	—	5	90423A120	0000
		10-24	3/8"	7/32"	0.5"	0.03"	—	5	90423A130	0000
		10-32	3/8"	7/32"	0.5"	0.03"	Material Certificate	5	90423A150	0000
		12-24	7/16"	15/64"	0.594"	0.04"	—	5	90423A140	00000
		1/4"-20	7/16"	15/64"	0.594"	0.04"	—	10	98892A131	0000
		1/4"-28	7/16"	15/64"	0.594"	0.04"	—	1	90423A160	0000
		5/16"-18	1/2"	9/32"	0.68"	0.04"	—	10	98892A132	0000
		3/8"-16	9/16"	11/32"	0.75"	0.04"	—	10	98892A133	0000
		3/8"-24	9/16"	11/32"	0.75"	0.04"	—	1	90423A170	0000
		1/2"-13	3/4"	29/64"	1.031"	0.04"	Material Certificate	5	98892A134	00000


		1/2"-20	3/4"	29/64"	1.031"	0.05"	—	1	90423A180	0000

Self-Aligning Press-Fit Locknuts for Sheet Metal

Fasten together unaligned parts and keep screws in place. The threaded hole within these press-fit nuts shifts up to .01" in any direction, so you can fasten together thin panels with off-center holes. The irregularly shaped threads tightly grip screws to prevent them from loosening or backing out under vibration.

18-8 Stainless Steel—The choice for wet and outdoor environments, these nuts resist rust and mild chemicals.

					Head		Barrel
	Thread Size	Drill Bit Size	For Min. Panel Thk.	For Maximum Panel Hardness	OD	Ht.	Dia.	Ht.	PEM® Part No.	Mil. Spec.	Pkg. Qty.		Pkg.
Distorted-Thread Locking







				18-8 Stainless Steel

				4-40	L	0.038"	Brinell 125, Rockwell B70	0.36"	0.038"	9/64"	3/16"	LAC-440-1MD	NASM25027	5	93177A110	000000


				4-40	L	0.054"	Brinell 125, Rockwell B70	0.36"	0.054"	9/64"	3/16"	LAC-440-2MD	NASM25027	5	93177A120	00000
				6-32	21/64"	0.038"	Brinell 125, Rockwell B70	0.39"	0.038"	3/16"	13/64"	LAC-632-1MD	NASM25027	5	93177A130	00000
				6-32	21/64"	0.054"	Brinell 125, Rockwell B70	0.39"	0.054"	3/16"	13/64"	LAC-632-2MD	NASM25027	5	93177A140	00000
				8-32	U	0.038"	Brinell 125, Rockwell B70	0.44"	0.038"	15/64"	13/64"	LAC-832-1MD	NASM25027	5	93177A150	00000
				8-32	U	0.054"	Brinell 125, Rockwell B70	0.44"	0.054"	15/64"	13/64"	LAC-832-2MD	NASM25027	5	93177A160	00000
				10-24	13/32"	0.054"	Brinell 125, Rockwell B70	0.47"	0.054"	7/32"	17/64"	LAC-024-2MD	NASM25027	5	93177A170	00000
				10-32	13/32"	0.038"	Brinell 125, Rockwell B70	0.47"	0.038"	7/32"	17/64"	LAC-032-1MD	NASM25027	5	93177A180	00000
				10-32	13/32"	0.054"	Brinell 125, Rockwell B70	0.47"	0.054"	17/64"	17/64"	LAC-032-2MD	NASM25027	5	93177A190	00000
				1/4"-20	33/64"	0.054"	Brinell 125, Rockwell B70	0.6"	0.054"	11/32"	5/16"	LAC-0420-2MD	NASM25027	1	93177A210	0000
				M3 x 0.5 mm	7.4 mm	0.97 mm	Brinell 125, Rockwell B70	9.14 mm	0.97 mm	4.2 mm	4.8 mm	LAC-M3-1MD	—	5	93177A220	00000


				M3 x 0.5 mm	7.4 mm	1.38 mm	Brinell 125, Rockwell B70	9.14 mm	1.38 mm	3.6 mm	4.8 mm	LAC-M3-2MD	—	5	93177A230	00000
				M4 x 0.7 mm	9.4 mm	0.97 mm	Brinell 125, Rockwell B70	11.18 mm	0.97 mm	4.8 mm	5.3 mm	LAC-M4-1MD	—	5	93177A240	00000
				M4 x 0.7 mm	9.4 mm	1.38 mm	Brinell 125, Rockwell B70	11.18 mm	1.38 mm	4.8 mm	5.3 mm	LAC-M4-2MD	—	5	93177A250	00000
				M5 x 0.8 mm	10.3 mm	0.97 mm	Brinell 125, Rockwell B70	11.94 mm	0.97 mm	6 mm	6.9 mm	LAC-M5-1MD	—	5	93177A260	00000
				M5 x 0.8 mm	10.3 mm	1.38 mm	Brinell 125, Rockwell B70	11.94 mm	1.38 mm	6 mm	6.9 mm	LAC-M5-2MD	—	5	93177A270	00000
				M6 x 1 mm	13.1 mm	1.38 mm	Brinell 125, Rockwell B70	15.24 mm	1.38 mm	7.2 mm	7.9 mm	LAC-M6-2MD	—	1	93177A280	0000