ISO 10511 Locknuts | McMaster-Carr

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High Strength

Withstand heavy loads and high stress without cracking

15 products

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The most common profile of locknut

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Fit in spaces with low clearance

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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-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



	M8 × 1 mm	13	8	Class 10	220	DIN 985, ISO 10511	10	94645A111	000000


	M10 × 1 mm	17	10	Class 10	220	DIN 985, ISO 10511	25	94645A213	0000
	M10 × 1.25 mm	17	10	Class 10	220	DIN 985, ISO 10511	10	94645A112	00000
	M12 × 1.25 mm	19	12	Class 10	220	DIN 985, ISO 10511	10	94645A113	00000
	M12 × 1.5 mm	19	12	Class 10	220	DIN 985, ISO 10511	10	94645A229	0000
	M14 × 1.5 mm	22	14	Class 10	220	DIN 985, ISO 10511	5	94645A115	00000
	M16 × 1.5 mm	24	16	Class 10	220	DIN 985, ISO 10511	1	94645A116	0000
	M18 × 1.5 mm	27	18	Class 10	220	DIN 985, ISO 10511	1	94645A117	0000
	M20 × 1.5 mm	30	20	Class 10	220	DIN 985, ISO 10511	1	94645A118	0000
	M20 × 2 mm	30	20	Class 10	220	DIN 985, ISO 10511	1	94645A119	00000
	M22 × 1.5 mm	32	22	Class 10	220	DIN 985, ISO 10511	1	94645A121	00000


	M24 × 1.5 mm	36	24	Class 10	220	DIN 985, ISO 10511	1	94645A122	00000
	M24 × 2 mm	36	24	Class 10	220	DIN 985, ISO 10511	1	94645A123	00000
	M30 × 2 mm	46	30	Class 10	220	DIN 985, ISO 10511	1	94645A124	00000
	M36 × 3 mm	55	36	Class 10	220	DIN 985, ISO 10511	1	94645A125	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-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—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.

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



		M3 × 0.5 mm	5.5	4	Class 8	220	DIN 985, ISO 10511	100	90576A811	000000


		M4 × 0.7 mm	7	5	Class 8	220	DIN 985, ISO 10511	100	90576A812	00000
		M5 × 0.8 mm	8	5	Class 8	220	DIN 985, ISO 10511	100	90576A813	00000
		M6 × 1 mm	10	6	Class 8	220	DIN 985, ISO 10511	100	90576A814	00000
		M8 × 1.25 mm	13	8	Class 8	220	DIN 985, ISO 10511	100	90576A815	00000
		M10 × 1.5 mm	17	10	Class 8	220	DIN 985, ISO 10511	50	90576A816	00000
		M12 × 1.75 mm	19	12	Class 8	220	DIN 985, ISO 10511	25	90576A817	00000
		M14 × 2 mm	22	14	Class 8	220	DIN 985, ISO 10511	25	90576A818	00000
		M16 × 2 mm	24	16	Class 8	220	DIN 985, ISO 10511	10	90576A819	0000
		M18 × 2.5 mm	27	18.5	Class 8	220	DIN 985, ISO 10511	5	90576A821	0000
		M20 × 2.5 mm	30	20	Class 8	220	DIN 985, ISO 10511	5	90576A822	0000


		M22 × 2.5 mm	32	22	Class 8	220	DIN 985, ISO 10511	5	90576A823	00000
		M24 × 3 mm	36	24	Class 8	220	DIN 985, ISO 10511	5	90576A824	00000


		Zinc-Plated Steel



				M3 × 0.5 mm	5.5	4	Class 8	220	DIN 985, ISO 10511	100	90576A102	0000


				M4 × 0.7 mm	7	5	Class 8	220	DIN 985, ISO 10511	100	90576A103	0000
				M5 × 0.8 mm	8	5	Class 8	220	DIN 985, ISO 10511	100	90576A104	0000
				M6 × 1 mm	10	6	Class 8	220	DIN 985, ISO 10511	100	90576A115	0000
				M7 × 1 mm	11	7.5	Class 8	220	DIN 985, ISO 10511	25	90576A212	0000
				M8 × 1 mm	13	8	Class 8	220	DIN 985, ISO 10511	25	90576A116	0000
				M8 × 1.25 mm	13	8	Class 8	220	DIN 985, ISO 10511	100	90576A117	00000
				M10 × 1 mm	17	10	Class 8	220	DIN 985, ISO 10511	25	90576A131	0000
				M10 × 1.25 mm	17	10	Class 8	220	DIN 985, ISO 10511	25	90576A132	00000
				M10 × 1.5 mm	17	10	Class 8	220	DIN 985, ISO 10511	50	90576A118	0000
				M12 × 1 mm	19	12	Class 8	220	DIN 985, ISO 10511	10	90576A137	0000


				M12 × 1.25 mm	19	12	Class 8	220	DIN 985, ISO 10511	25	90576A141	00000
				M12 × 1.5 mm	19	12	Class 8	220	DIN 985, ISO 10511	20	90576A144	00000
				M12 × 1.75 mm	19	12	Class 8	220	DIN 985, ISO 10511	50	90576A119	00000
				M14 × 1.5 mm	22	14	Class 8	220	DIN 985, ISO 10511	10	90576A147	0000
				M14 × 2 mm	22	14	Class 8	220	DIN 985, ISO 10511	25	90576A120	00000
				M16 × 1.5 mm	24	16	Class 8	220	DIN 985, ISO 10511	10	90576A152	00000
				M16 × 2 mm	24	16	Class 8	220	DIN 985, ISO 10511	25	90576A122	00000
				M18 × 1.5 mm	27	18.5	Class 8	220	DIN 985, ISO 10511	10	90576A106	00000
				M18 × 2.5 mm	27	18.5	Class 8	220	DIN 985, ISO 10511	10	90576A123	00000
				M20 × 1.5 mm	30	20	Class 8	220	DIN 985, ISO 10511	5	90576A172	00000


				M20 × 2 mm	30	20	Class 8	220	DIN 985, ISO 10511	1	90576A155	0000
				M20 × 2.5 mm	30	20	Class 8	220	DIN 985, ISO 10511	10	90576A125	00000
				M22 × 1.5 mm	32	22	Class 8	220	DIN 985, ISO 10511	5	90576A299	00000
				M22 × 2.5 mm	32	22	Class 8	220	DIN 985, ISO 10511	5	90576A162	00000
				M24 × 1.5 mm	36	24	Class 8	220	DIN 985, ISO 10511	1	90576A326	0000
				M24 × 2 mm	36	24	Class 8	220	DIN 985, ISO 10511	1	90576A304	0000
				M24 × 3 mm	36	24	Class 8	220	DIN 985, ISO 10511	5	90576A129	00000
				M27 × 1.5 mm	41	27	Class 8	220	DIN 985, ISO 10511	1	90576A352	0000
				M27 × 2 mm	41	27	Class 8	220	DIN 985, ISO 10511	1	90576A342	0000
				M27 × 3 mm	41	27	Class 8	220	DIN 985, ISO 10511	1	90576A140	0000


M30 × 2 mm	46			30	Class 8	220	DIN 985, ISO 10511	1	90576A366	00000
M30 × 3.5 mm	46			30	Class 8	220	DIN 985, ISO 10511	1	90576A150	0000
M33 × 2 mm	50			33	Class 8	220	DIN 985, ISO 10511	1	90576A384	00000
M33 × 3.5 mm	50			33	Class 8	220	DIN 985, ISO 10511	1	90576A163	00000
M36 × 3 mm	55			36	Class 8	220	DIN 985, ISO 10511	1	90576A452	00000
M36 × 4 mm	55			36	Class 8	220	DIN 985, ISO 10511	1	90576A164	00000
M39 × 3 mm	60			39	Class 8	220	DIN 985, ISO 10511	1	90576A523	00000
M42 × 3 mm	65			42	Class 8	220	DIN 985, ISO 10511	1	90576A531	00000
M45 × 3 mm	70			45	Class 8	220	DIN 985, ISO 10511	1	90576A544	00000
M48 × 3 mm	75			48	Class 8	220	DIN 985, ISO 10511	1	90576A726	00000


M48 × 5 mm	75			48	Class 8	220	DIN 985, ISO 10511	1	90576A166	00000


Black-Corrosion-Resistant-Coated Steel



				M4 × 0.7 mm	7	5	Class 8	220	DIN 985, ISO 10511	5	90819A111	00000


				M5 × 0.8 mm	8	5	Class 8	220	DIN 985, ISO 10511	5	90819A112	00000
		M6 × 1 mm		10	6	Class 8	220	DIN 985, ISO 10511	5	90819A113	00000
		M8 × 1.25 mm	13	8	Class 8	220	DIN 985, ISO 10511	5	90819A114	00000
		M10 × 1.5 mm	17	10	Class 8	220	DIN 985, ISO 10511	5	90819A115	00000
		M12 × 1.75 mm	19	12	Class 8	220	DIN 985, ISO 10511	1	90819A116	0000
		M14 × 2 mm	22	14	Class 8	220	DIN 985, ISO 10511	1	90819A117	0000

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	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M3 × 0.5 mm	5.5	3.9	245	ISO 10511	25	90453A111	000000


	M4 × 0.7 mm	7	5	245	ISO 10511	25	90453A112	0000
	M5 × 0.8 mm	8	5	245	ISO 10511	25	90453A113	0000
	M6 × 1 mm	10	6	245	ISO 10511	10	90453A114	0000
	M8 × 1.25 mm	13	6.8	245	ISO 10511	5	90453A115	0000
	M10 × 1.5 mm	16	8.6	245	ISO 10511	5	90453A116	0000
	M12 × 1.75 mm	18	10.3	245	ISO 10511	5	90453A117	0000
	M14 × 2 mm	21	11.4	245	ISO 10511	5	90453A118	0000
	M16 × 2 mm	24	12.5	245	ISO 10511	1	90453A119	0000
	M18 × 2.5 mm	26	13	245	ISO 10511	1	90453A121	0000
	M20 × 2.5 mm	30	14.9	245	ISO 10511	1	90453A122	0000


	M24 × 3 mm	36	17.8	245	ISO 10511	1	90453A123	00000