Class 8 Steel Hex Nuts | McMaster-Carr

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29 Products

Locknuts for use with Cotter Pins

Use these locknuts to secure rotating parts subjected to mild vibration, such as the wheels on carts and hand trucks. They’re not recommended for use on parts exposed to high vibration because the pin can shear under prolonged stress. These nuts are reusable, but you'll need a new cotter pin (not included) with each use.

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

Steel—Best for dry environments since moisture will cause these nuts to rust.

	Wd., mm	Ht., mm	Fastener Strength Grade/Class	For Cotter Pin Dia., mm	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel


	M6 × 1 mm	10	7.5	ISO Class 8	1.6	DIN 935	5	000000000	00000
	M8 × 1.25 mm	13	9.5	ISO Class 8	2	DIN 935	5	000000000	0000
	M10 × 1.5 mm	17	12	ISO Class 8	2.5	DIN 935	5	000000000	0000
	M12 × 1.5 mm	19	15	ISO Class 8	3.2	DIN 935	5	000000000	0000
	M12 × 1.75 mm	19	15	ISO Class 8	3.2	DIN 935	5	000000000	0000
	M14 × 1.5 mm	22	16	ISO Class 8	3.2	DIN 935	1	000000000	0000
	M14 × 2 mm	22	16	ISO Class 8	3.2	DIN 935	1	000000000	0000
	M16 × 1.5 mm	24	19	ISO Class 8	4	DIN 935	10	000000000	00000
	M16 × 2 mm	24	19	ISO Class 8	4	DIN 935	5	000000000	0000
	M18 × 2.5 mm	27	21	ISO Class 8	4	DIN 935	1	000000000	0000
	M20 × 2.5 mm	30	22	ISO Class 8	4	DIN 935	5	000000000	00000
	M24 × 2 mm	36	27	ISO Class 8	5	DIN 935	1	000000000	0000
	M24 × 3 mm	36	27	ISO Class 8	5	DIN 935	1	000000000	0000
	M27 × 3 mm	41	30	ISO Class 8	5	DIN 935	1	000000000	00000
	M30 × 3.5 mm	46	33	ISO Class 8	6.3	DIN 935	1	000000000	00000

	Steel


			M12 × 1.5 mm	19	15	ISO Class 8	3.2	DIN 935	10	000000000	0000
			M14 × 1.5 mm	22	16	ISO Class 8	3.2	DIN 935	1	000000000	0000
			M14 × 2 mm	22	16	ISO Class 8	3.2	DIN 935	1	000000000	0000
			M16 × 1.5 mm	24	19	ISO Class 8	4	DIN 935	1	000000000	0000
			M16 × 2 mm	24	19	ISO Class 8	4	DIN 935	1	000000000	0000
			M18 × 2.5 mm	27	21	ISO Class 8	4	DIN 935	1	000000000	0000
			M20 × 2.5 mm	30	22	ISO Class 8	4	DIN 935	1	000000000	0000
			M24 × 3 mm	36	27	ISO Class 8	5	DIN 935	1	000000000	0000
			M30 × 3.5 mm	46	33	ISO Class 8	6.3	DIN 935	1	000000000	00000
			M36 × 3 mm	55	38	ISO Class 8	6.3	DIN 935	1	000000000	00000
			M36 × 4 mm	55	38	ISO Class 8	6.3	DIN 935	1	000000000	00000
			M42 × 4.5 mm	65	46	ISO Class 8	8	DIN 935	1	000000000	00000
			M48 × 5 mm	75	50	ISO Class 8	8	DIN 935	1	000000000	00000
			M56 × 5.5 mm	85	57	ISO Class 8	8	DIN 935	1	000000000	00000