ISO 10511 Locknuts | McMaster-Carr

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Locknuts

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Thread Size

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Hex Nut Profile

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Corrosion-Resistant Coated

Zinc Plated

Zinc Yellow-Chromate Plated

Height

Width

Locking Type

Fastener Strength Grade/Class

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Fastener Strength Rating

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185° F

245° F

DFARS Specialty Metals

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EAR99

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Performance

High Strength

Withstand heavy loads and high stress without cracking

15 products

Hex Nut Profile

Standard

The most common profile of locknut

82 products

Hex Nut Profile

Thin

Fit in spaces with low clearance

12 products

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

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

							Small Pack
	Thread Size	Wd., mm	Ht., mm	Fastener Strength Grade/Class	Insert Max. Temp., ° F	Certificate Type	Pkg. Qty.		Pkg.
Zinc-Plated Steel



		M8 × 1 mm	13	8	Class 10	185	Material Certificate	10	94645A111	000000


		M10 × 1.25 mm	17	10	Class 10	185	Material Certificate	10	94645A112	00000
		M10 × 1 mm	17	10	Class 10	185	Material Certificate	25	94645A213	0000
		M12 × 1.5 mm	19	12	Class 10	185	Material Certificate	10	94645A229	0000
		M12 × 1.25 mm	19	12	Class 10	185	Material Certificate	10	94645A113	00000
		M14 × 1.5 mm	22	14	Class 10	185	Material Certificate	5	94645A115	00000
		M16 × 1.5 mm	24	16	Class 10	185	Material Certificate	1	94645A116	0000
		M18 × 1.5 mm	27	18	Class 10	185	Material Certificate	1	94645A117	0000
		M20 × 2 mm	30	20	Class 10	185	Material Certificate	1	94645A119	00000
		M20 × 1.5 mm	30	20	Class 10	185	Material Certificate	1	94645A118	0000
		M22 × 1.5 mm	32	22	Class 10	185	Material Certificate	1	94645A121	00000


		M24 × 2 mm	36	24	Class 10	185	Material Certificate	1	94645A123	00000
		M24 × 1.5 mm	36	24	Class 10	185	Material Certificate	1	94645A122	00000
		M30 × 2 mm	46	30	Class 10	185	Material Certificate	1	94645A124	00000
		M36 × 3 mm	55	36	Class 10	185	Material Certificate	1	94645A125	00000

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-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-Corrosion-Resistant-Coated 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.

Large Pack—Priced at least 30% lower per locknut than small packs.

							Small Pack			Large Pack
	Thread Size	Wd., mm	Ht., mm	Fastener Strength Grade/Class	Insert Max. Temp., ° F	Certificate Type	Pkg. Qty.		Pkg.	Pkg. Qty.		Pkg.
Zinc-Yellow-Chromate-Plated Steel



		M3 × 0.5 mm	5.5	4	Class 8	185	Material Certificate	100	90576A811	000000	2,000	90576A111	0000000


		M4 × 0.7 mm	7	5	Class 8	185	Material Certificate	100	90576A812	00000	—	———	0
		M5 × 0.8 mm	8	5	Class 8	185	Material Certificate	100	90576A813	00000	2,000	90576A126	000000
		M6 × 1 mm	10	6	Class 8	185	Material Certificate	100	90576A814	00000	2,000	90576A128	000000
		M8 × 1.25 mm	13	8	Class 8	185	—	100	90576A815	00000	—	———	0
		M8 × 1.25 mm	13	8	Class 8	185	Material Certificate	—	———	0	2,000	90576A133	000000
		M10 × 1.5 mm	17	10	Class 8	185	Material Certificate	50	90576A816	00000	1,000	90576A134	000000
		M12 × 1.75 mm	19	12	Class 8	185	Material Certificate	25	90576A817	00000	500	90576A135	000000
		M14 × 2 mm	22	14	Class 8	185	—	25	90576A818	00000	—	———	0
		M16 × 2 mm	24	16	Class 8	185	—	10	90576A819	0000	—	———	0
		M18 × 2.5 mm	27	18.5	Class 8	185	—	5	90576A821	0000	—	———	0


		M20 × 2.5 mm	30	20	Class 8	185	Material Certificate	5	90576A822	0000	—	———	0
		M22 × 2.5 mm	32	22	Class 8	185	—	5	90576A823	00000	—	———	0
		M24 × 3 mm	36	24	Class 8	185	—	5	90576A824	00000	—	———	0


		Zinc-Plated Steel



				M3 × 0.5 mm	5.5	4	Class 8	185	—	100	90576A102	0000	—	———	0


				M4 × 0.7 mm	7	5	Class 8	185	Material Certificate	100	90576A103	0000	—	———	0
				M5 × 0.8 mm	8	5	Class 8	185	Material Certificate	100	90576A104	0000	—	———	0
				M6 × 1 mm	10	6	Class 8	185	Material Certificate	100	90576A115	0000	—	———	0
				M7 × 1 mm	11	7.5	Class 8	185	Material Certificate	25	90576A212	00000	—	———	0
				M8 × 1.25 mm	13	8	Class 8	185	Material Certificate	100	90576A117	00000	—	———	0
				M8 × 1 mm	13	8	Class 8	185	—	25	90576A116	0000	—	———	0
				M10 × 1.5 mm	17	10	Class 8	185	—	50	90576A118	0000	—	———	0
				M10 × 1.25 mm	17	10	Class 8	185	Material Certificate	25	90576A132	00000	500	90576A138	000000
				M10 × 1 mm	17	10	Class 8	185	Material Certificate	25	90576A131	0000	—	———	0
				M12 × 1.5 mm	19	12	Class 8	185	—	20	90576A144	00000	—	———	0


				M12 × 1.25 mm	19	12	Class 8	185	Material Certificate	25	90576A141	00000	—	———	0
				M12 × 1 mm	19	12	Class 8	185	Material Certificate	10	90576A137	0000	—	———	0
				M14 × 2 mm	22	14	Class 8	185	Material Certificate	25	90576A120	00000	—	———	0
				M14 × 1.5 mm	22	14	Class 8	185	—	10	90576A147	0000	—	———	0
				M16 × 1.5 mm	24	16	Class 8	185	—	10	90576A152	00000	—	———	0
				M18 × 2.5 mm	27	18.5	Class 8	185	—	10	90576A123	00000	—	———	0
				M18 × 1.5 mm	27	18.5	Class 8	185	Material Certificate	10	90576A106	00000	—	———	0
				M20 × 2.5 mm	30	20	Class 8	185	Material Certificate	10	90576A125	00000	—	———	0
				M20 × 2 mm	30	20	Class 8	185	—	1	90576A155	0000	—	———	0
				M20 × 1.5 mm	30	20	Class 8	185	Material Certificate	5	90576A172	00000	—	———	0


				M22 × 2.5 mm	32	22	Class 8	185	—	5	90576A162	00000	—	———	0
				M22 × 1.5 mm	32	22	Class 8	185	—	5	90576A299	00000	—	———	0
				M24 × 3 mm	36	24	Class 8	185	—	5	90576A129	00000	—	———	0
				M24 × 2 mm	36	24	Class 8	185	—	1	90576A304	0000	—	———	0
				M24 × 1.5 mm	36	24	Class 8	185	—	1	90576A326	0000	—	———	0
				M27 × 3 mm	41	27	Class 8	185	—	1	90576A140	0000	—	———	0
				M27 × 2 mm	41	27	Class 8	185	Material Certificate	1	90576A342	0000	—	———	0
				M27 × 1.5 mm	41	27	Class 8	185	Material Certificate	1	90576A352	00000	—	———	0
				M30 × 3.5 mm	46	30	Class 8	185	—	1	90576A150	0000	—	———	0
				M30 × 2 mm	46	30	Class 8	185	—	1	90576A366	00000	—	———	0


M33 × 3.5 mm	50			33	Class 8	185	Material Certificate	1	90576A163	00000	—	———	0
M33 × 2 mm	50			33	Class 8	185	—	1	90576A384	00000	—	———	0
M36 × 4 mm	55			36	Class 8	185	—	1	90576A164	00000	—	———	0
M36 × 3 mm	55			36	Class 8	185	—	1	90576A452	00000	—	———	0
M39 × 3 mm	60			39	Class 8	185	Material Certificate	1	90576A523	00000	—	———	0
M42 × 3 mm	65			42	Class 8	185	—	1	90576A531	00000	—	———	0
M45 × 3 mm	70			45	Class 8	185	—	1	90576A544	00000	—	———	0
M48 × 5 mm	75			48	Class 8	185	Material Certificate	1	90576A166	00000	—	———	0
M48 × 3 mm	75			48	Class 8	185	Material Certificate	1	90576A726	00000	—	———	0


Black-Corrosion-Resistant-Coated Steel



				M4 × 0.7 mm	7	5	Class 8	185	—	5	90819A111	00000	—	———	0


				M5 × 0.8 mm	8	5	Class 8	185	—	5	90819A112	00000	—	———	0
				M6 × 1 mm	10	6	Class 8	185	—	5	90819A113	00000	—	———	0
				M8 × 1.25 mm	13	8	Class 8	185	—	5	90819A114	00000	—	———	0
				M10 × 1.5 mm	17	10	Class 8	185	—	5	90819A115	00000	—	———	0
				M12 × 1.75 mm	19	12	Class 8	185	—	1	90819A116	0000	—	———	0
		M14 × 2 mm		22	14	Class 8	185	—	1	90819A117	0000	—	———	0

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.

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., mm	Ht., mm	Insert Max. Temp., ° F	Certificate Type	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M3 × 0.5 mm	5.5	3.9	245	Material Certificate	25	90453A111	00000


	M4 × 0.7 mm	7	5	245	—	25	90453A112	0000
	M5 × 0.8 mm	8	5	245	—	25	90453A113	0000
	M6 × 1 mm	10	6	245	Material Certificate	10	90453A114	0000
	M8 × 1.25 mm	13	6.8	245	Material Certificate	5	90453A115	0000
	M10 × 1.5 mm	16	8.6	245	—	5	90453A116	0000
	M12 × 1.75 mm	18	10.3	245	—	5	90453A117	0000
	M14 × 2 mm	21	11.4	245	—	5	90453A118	0000
	M16 × 2 mm	24	12.5	245	—	1	90453A119	0000
	M18 × 2.5 mm	26	13	245	—	1	90453A121	0000
	M20 × 2.5 mm	30	14.9	245	—	1	90453A122	0000


	M24 × 3 mm	36	17.8	245	—	1	90453A123	00000