Class 4 Steel Hex Nuts | McMaster-Carr

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ISO Class 04

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About Hex Nuts

Choose a hex nut with the right profile, material, and strength for your application.

Thin-Profile Hex Nuts

About half the height of standard-profile nuts, these fit in spaces with low clearance. You can also use them as jam nuts by threading them against another hex nut to hold it in place.

Medium-Strength Steel

These Grade 5 or Class 04 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.

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.

	Thread Size	Wd., mm	Ht., mm	Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel



		M2 × 0.4 mm	4	1.2	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000


		M2.5 × 0.45 mm	5	1.6	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000
		M3 × 0.5 mm	5.5	1.8	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
		M3.5 × 0.6 mm	6	2	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000
		M4 × 0.7 mm	7	2.2	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
		M5 × 0.5 mm	8	2.7	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
		M5 × 0.8 mm	8	2.7	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
		M6 × 0.75 mm	10	3.2	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
		M6 × 1 mm	10	3.2	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
		M7 × 1 mm	11	3.5	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000
		M8 × 1 mm	13	4	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000


		M8 × 1.25 mm	13	4	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
		M10 × 1 mm	17	5	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000
		M10 × 1.25 mm	17	5	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000
		M10 × 1.5 mm	17	5	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000
		M12 × 1 mm	19	6	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
		M12 × 1.25 mm	19	6	ISO Class 04	DIN 439B, ISO 4035	50	000000000	00000
		M12 × 1.5 mm	19	6	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
		M12 × 1.75 mm	19	6	ISO Class 04	DIN 439B, ISO 4035	50	000000000	00000
		M14 × 1.25 mm	22	7	ISO Class 04	DIN 439B, ISO 4035	10	000000000	00000
		M14 × 1.5 mm	22	7	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000


		M14 × 2 mm	22	7	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
		M16 × 1 mm	24	8	ISO Class 04	DIN 439B, ISO 4035	5	000000000	00000
		M16 × 1.5 mm	24	8	ISO Class 04	DIN 439B, ISO 4035	10	000000000	00000
		M16 × 2 mm	24	8	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
		M18 × 1.5 mm	27	9	ISO Class 04	DIN 439B, ISO 4035	10	000000000	00000
		M18 × 2.5 mm	27	9	ISO Class 04	DIN 439B, ISO 4035	10	000000000	00000
		M20 × 1.5 mm	30	10	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
		M20 × 2.5 mm	30	10	ISO Class 04	DIN 439B, ISO 4035	10	000000000	00000
		M22 × 1.5 mm	32	11	ISO Class 04	DIN 439B, ISO 4035	10	000000000	00000
		M22 × 2.5 mm	32	11	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000


		M24 × 1.5 mm	36	12	ISO Class 04	DIN 439B, ISO 4035	5	000000000	00000
		M24 × 2 mm	36	12	ISO Class 04	DIN 439B, ISO 4035	5	000000000	00000
		M24 × 3 mm	36	12	ISO Class 04	DIN 439B, ISO 4035	5	000000000	00000
		M27 × 2 mm	41	13.5	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
		M27 × 3 mm	41	13.5	ISO Class 04	DIN 439B, ISO 4035	5	000000000	00000
		M30 × 2 mm	46	15	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000
		M30 × 3.5 mm	46	15	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000
		M36 × 3 mm	55	18	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
		M36 × 4 mm	55	18	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
		M42 × 4.5 mm	65	21	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000


		M48 × 5 mm	75	24	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000


		Zinc-Yellow-Chromate-Plated Steel



				M4 × 0.7 mm	7	2.2	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000


M5 × 0.8 mm				8	2.7	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
M6 × 1 mm	10			3.2	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
M8 × 1 mm	13			4	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
M8 × 1.25 mm	13			4	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000
M10 × 1.25 mm	17			5	ISO Class 04	DIN 439B, ISO 4035	25	000000000	0000
M10 × 1.5 mm	17			5	ISO Class 04	DIN 439B, ISO 4035	50	000000000	00000
M12 × 1.5 mm	19			6	ISO Class 04	DIN 439B, ISO 4035	25	000000000	0000
M12 × 1.75 mm	19			6	ISO Class 04	DIN 439B, ISO 4035	50	000000000	00000
M14 × 1.5 mm	22			7	ISO Class 04	DIN 439B, ISO 4035	25	000000000	0000
M14 × 2 mm	22			7	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000


M16 × 1.5 mm	24			8	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
M16 × 2 mm	24			8	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
M18 × 1.5 mm	27			9	ISO Class 04	DIN 439B, ISO 4035	5	000000000	0000
M20 × 1.5 mm	30			10	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
M20 × 2.5 mm	30			10	ISO Class 04	DIN 439B, ISO 4035	10	000000000	00000
M22 × 1.5 mm	32			11	ISO Class 04	DIN 439B, ISO 4035	5	000000000	0000
M30 × 2 mm	46			15	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000