High Locknuts | McMaster-Carr

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49 Products

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

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



	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-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.

	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
	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