ISO 10511 Locknuts | McMaster-Carr

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89 Products

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High Strength

Withstand heavy loads and high stress without cracking

15 products

Hex Nut Profile

Standard

The most common profile of locknut

77 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, 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	ISO Class 10	220	DIN 985, ISO 10511	10	000000000	000000
	M10 × 1 mm	17	10	ISO Class 10	220	DIN 985, ISO 10511	25	000000000	00000
	M10 × 1.25 mm	17	10	ISO Class 10	220	DIN 985, ISO 10511	10	000000000	00000
	M12 × 1.25 mm	19	12	ISO Class 10	220	DIN 985, ISO 10511	10	000000000	00000
	M12 × 1.5 mm	19	12	ISO Class 10	220	DIN 985, ISO 10511	10	000000000	00000
	M14 × 1.5 mm	22	14	ISO Class 10	220	DIN 985, ISO 10511	5	000000000	00000
	M16 × 1.5 mm	24	16	ISO Class 10	220	DIN 985, ISO 10511	1	000000000	0000
	M18 × 1.5 mm	27	18	ISO Class 10	220	DIN 985, ISO 10511	1	000000000	0000
	M20 × 1.5 mm	30	20	ISO Class 10	220	DIN 985, ISO 10511	1	000000000	0000
	M20 × 2 mm	30	20	ISO Class 10	220	DIN 985, ISO 10511	1	000000000	00000
	M22 × 1.5 mm	32	22	ISO Class 10	220	DIN 985, ISO 10511	1	000000000	00000
	M24 × 1.5 mm	36	24	ISO Class 10	220	DIN 985, ISO 10511	1	000000000	00000
	M24 × 2 mm	36	24	ISO Class 10	220	DIN 985, ISO 10511	1	000000000	00000
	M30 × 2 mm	46	30	ISO Class 10	220	DIN 985, ISO 10511	1	000000000	00000
	M36 × 3 mm	55	36	ISO Class 10	220	DIN 985, ISO 10511	1	000000000	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	ISO Class 8	220	DIN 985, ISO 10511	100	000000000	000000
		M4 × 0.7 mm	7	5	ISO Class 8	220	DIN 985, ISO 10511	100	000000000	00000
		M5 × 0.8 mm	8	5	ISO Class 8	220	DIN 985, ISO 10511	100	000000000	00000
		M6 × 1 mm	10	6	ISO Class 8	220	DIN 985, ISO 10511	100	000000000	00000
		M8 × 1.25 mm	13	8	ISO Class 8	220	DIN 985, ISO 10511	100	000000000	00000
		M10 × 1.5 mm	17	10	ISO Class 8	220	DIN 985, ISO 10511	50	000000000	00000
		M12 × 1.75 mm	19	12	ISO Class 8	220	DIN 985, ISO 10511	25	000000000	00000
		M14 × 2 mm	22	14	ISO Class 8	220	DIN 985, ISO 10511	25	000000000	00000
		M16 × 2 mm	24	16	ISO Class 8	220	DIN 985, ISO 10511	10	000000000	00000
		M18 × 2.5 mm	27	18.5	ISO Class 8	220	DIN 985, ISO 10511	5	000000000	00000
		M20 × 2.5 mm	30	20	ISO Class 8	220	DIN 985, ISO 10511	5	000000000	00000
		M22 × 2.5 mm	32	22	ISO Class 8	220	DIN 985, ISO 10511	5	000000000	00000
		M24 × 3 mm	36	24	ISO Class 8	220	DIN 985, ISO 10511	5	000000000	00000

		Zinc-Plated Steel


				M3 × 0.5 mm	5.5	4	ISO Class 8	220	DIN 985, ISO 10511	100	000000000	0000
				M4 × 0.7 mm	7	5	ISO Class 8	220	DIN 985, ISO 10511	100	000000000	0000
				M5 × 0.8 mm	8	5	ISO Class 8	220	DIN 985, ISO 10511	100	000000000	0000
				M6 × 1 mm	10	6	ISO Class 8	220	DIN 985, ISO 10511	100	000000000	0000
				M7 × 1 mm	11	7.5	ISO Class 8	220	DIN 985, ISO 10511	25	000000000	00000
				M8 × 1 mm	13	8	ISO Class 8	220	DIN 985, ISO 10511	25	000000000	0000
				M8 × 1.25 mm	13	8	ISO Class 8	220	DIN 985, ISO 10511	100	000000000	00000
				M10 × 1 mm	17	10	ISO Class 8	220	DIN 985, ISO 10511	25	000000000	00000
				M10 × 1.25 mm	17	10	ISO Class 8	220	DIN 985, ISO 10511	25	000000000	00000
				M10 × 1.5 mm	17	10	ISO Class 8	220	DIN 985, ISO 10511	50	000000000	00000
				M12 × 1 mm	19	12	ISO Class 8	220	DIN 985, ISO 10511	10	000000000	00000
				M12 × 1.25 mm	19	12	ISO Class 8	220	DIN 985, ISO 10511	25	000000000	00000
				M12 × 1.5 mm	19	12	ISO Class 8	220	DIN 985, ISO 10511	20	000000000	00000
				M12 × 1.75 mm	19	12	ISO Class 8	220	DIN 985, ISO 10511	50	000000000	00000
				M14 × 1.5 mm	22	14	ISO Class 8	220	DIN 985, ISO 10511	10	000000000	00000
				M14 × 2 mm	22	14	ISO Class 8	220	DIN 985, ISO 10511	25	000000000	00000
				M16 × 1.5 mm	24	16	ISO Class 8	220	DIN 985, ISO 10511	10	000000000	00000
				M16 × 2 mm	24	16	ISO Class 8	220	DIN 985, ISO 10511	25	000000000	00000
				M18 × 1.5 mm	27	18.5	ISO Class 8	220	DIN 985, ISO 10511	10	000000000	00000
				M18 × 2.5 mm	27	18.5	ISO Class 8	220	DIN 985, ISO 10511	10	000000000	00000
				M20 × 1.5 mm	30	20	ISO Class 8	220	DIN 985, ISO 10511	5	000000000	00000
				M20 × 2 mm	30	20	ISO Class 8	220	DIN 985, ISO 10511	1	000000000	0000
				M20 × 2.5 mm	30	20	ISO Class 8	220	DIN 985, ISO 10511	10	000000000	00000
				M22 × 1.5 mm	32	22	ISO Class 8	220	DIN 985, ISO 10511	5	000000000	00000
				M22 × 2.5 mm	32	22	ISO Class 8	220	DIN 985, ISO 10511	5	000000000	00000
				M24 × 1.5 mm	36	24	ISO Class 8	220	DIN 985, ISO 10511	1	000000000	0000
				M24 × 2 mm	36	24	ISO Class 8	220	DIN 985, ISO 10511	1	000000000	0000
				M24 × 3 mm	36	24	ISO Class 8	220	DIN 985, ISO 10511	5	000000000	00000
				M27 × 1.5 mm	41	27	ISO Class 8	220	DIN 985, ISO 10511	1	000000000	00000
				M27 × 2 mm	41	27	ISO Class 8	220	DIN 985, ISO 10511	1	000000000	00000
				M27 × 3 mm	41	27	ISO Class 8	220	DIN 985, ISO 10511	1	000000000	00000
				M30 × 2 mm	46	30	ISO Class 8	220	DIN 985, ISO 10511	1	000000000	00000
				M30 × 3.5 mm	46	30	ISO Class 8	220	DIN 985, ISO 10511	1	000000000	00000
				M33 × 2 mm	50	33	ISO Class 8	220	DIN 985, ISO 10511	1	000000000	00000
				M33 × 3.5 mm	50	33	ISO Class 8	220	DIN 985, ISO 10511	1	000000000	00000
				M36 × 3 mm	55	36	ISO Class 8	220	DIN 985, ISO 10511	1	000000000	00000
				M36 × 4 mm	55	36	ISO Class 8	220	DIN 985, ISO 10511	1	000000000	00000
				M39 × 3 mm	60	39	ISO Class 8	220	DIN 985, ISO 10511	1	000000000	00000
				M42 × 3 mm	65	42	ISO Class 8	220	DIN 985, ISO 10511	1	000000000	00000
				M45 × 3 mm	70	45	ISO Class 8	220	DIN 985, ISO 10511	1	000000000	00000
				M48 × 3 mm	75	48	ISO Class 8	220	DIN 985, ISO 10511	1	000000000	00000
				M48 × 5 mm	75	48	ISO Class 8	220	DIN 985, ISO 10511	1	000000000	00000

				Black-Corrosion-Resistant-Coated Steel


	M4 × 0.7 mm				7	5	ISO Class 8	220	DIN 985, ISO 10511	5	000000000	00000
	M5 × 0.8 mm				8	5	ISO Class 8	220	DIN 985, ISO 10511	5	000000000	00000
	M6 × 1 mm				10	6	ISO Class 8	220	DIN 985, ISO 10511	5	000000000	00000
	M8 × 1.25 mm				13	8	ISO Class 8	220	DIN 985, ISO 10511	5	000000000	00000
	M10 × 1.5 mm				17	10	ISO Class 8	220	DIN 985, ISO 10511	5	000000000	00000
	M12 × 1.75 mm				19	12	ISO Class 8	220	DIN 985, ISO 10511	1	000000000	0000
	M14 × 2 mm				22	14	ISO Class 8	220	DIN 985, ISO 10511	1	000000000	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	000000000	00000
	M4 × 0.7 mm	7	5	245	ISO 10511	25	000000000	0000
	M5 × 0.8 mm	8	5	245	ISO 10511	25	000000000	0000
	M6 × 1 mm	10	6	245	ISO 10511	10	000000000	0000
	M8 × 1.25 mm	13	6.8	245	ISO 10511	5	000000000	0000
	M10 × 1.5 mm	16	8.6	245	ISO 10511	5	000000000	0000
	M12 × 1.75 mm	18	10.3	245	ISO 10511	5	000000000	0000
	M14 × 2 mm	21	11.4	245	ISO 10511	5	000000000	0000
	M16 × 2 mm	24	12.5	245	ISO 10511	1	000000000	0000
	M18 × 2.5 mm	26	13	245	ISO 10511	1	000000000	0000
	M20 × 2.5 mm	30	14.9	245	ISO 10511	1	000000000	0000
	M24 × 3 mm	36	17.8	245	ISO 10511	1	000000000	00000