Class 4 Steel Hex Nuts | McMaster-Carr

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Fastener Strength Grade/Class

ISO Class 04

Material

Steel

System of Measurement

Thread Size

Thread Pitch

Hex Nut Profile

Height

Finish

Zinc Yellow-Chromate Plated

Nut Type

Thread Direction

Width

Thread Spacing

Specifications Met

Thread Type

Thread Fit

Fastener Strength Rating

Medium

RoHS

Compliant

Compliant with Exemptions

Not Compliant

REACH

Compliant

Not Compliant

Export Control Classification Number (ECCN)

EAR99

Color

Blue

DFARS Specialty Metals

Exempt

Certificate Type

Material Certificate with Traceable Lot Number

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124 Products

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.

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

Blue Dyed Steel—These metric-sized nuts have a distinctive blue color, so you can easily tell them apart from inch nuts.

	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	0000


		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	0000
		M12 × 1.25 mm	19	6	ISO Class 04	DIN 439B, ISO 4035	50	000000000	0000
		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 × 1.25 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	0000


		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	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	10	000000000	0000
		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	0000
		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


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	50	000000000	00000
				M8 × 1.25 mm	13	4	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
				M10 × 1.25 mm	17	5	ISO Class 04	DIN 439B, ISO 4035	50	000000000	00000
				M10 × 1.5 mm	17	5	ISO Class 04	DIN 439B, ISO 4035	100	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	0000
				M14 × 1.5 mm	22	7	ISO Class 04	DIN 439B, ISO 4035	50	000000000	00000
				M16 × 1.5 mm	24	8	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000


				M16 × 2 mm	24	8	ISO Class 04	DIN 439B, ISO 4035	25	000000000	0000
				M18 × 1.5 mm	27	9	ISO Class 04	DIN 439B, ISO 4035	10	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	0000
				M22 × 1.5 mm	32	11	ISO Class 04	DIN 439B, ISO 4035	10	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	0000
				M27 × 1.5 mm	41	13.5	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
				M27 × 2 mm	41	13.5	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000


				M30 × 2 mm	46	15	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000
				M33 × 2 mm	50	16.5	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
				M36 × 4 mm	55	18	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000
				M39 × 3 mm	60	19.5	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
				M42 × 3 mm	65	21	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
				M45 × 3 mm	70	22.5	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
				M48 × 3 mm	75	24	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
		M52 × 3 mm	80	26	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
		M52 × 5 mm	80	26	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000


		Blue Dyed Steel



				M6 × 1 mm	10	3.2	ISO Class 04	DIN 439B, ISO 4035	50	000000000	0000


				M8 × 1.25 mm	13	4	ISO Class 04	DIN 439B, ISO 4035	50	000000000	0000
				M10 × 1.5 mm	17	5	ISO Class 04	DIN 439B, ISO 4035	50	000000000	00000
				M12 × 1.75 mm	19	6	ISO Class 04	DIN 439B, ISO 4035	25	000000000	0000
				M16 × 2 mm	24	8	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
				M24 × 3 mm	36	12	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000

Medium-Strength Steel with Material Certificate

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.

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

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

	Wd., mm	Ht., mm	Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Steel



	M36 × 3 mm	55	18	ISO Class 04	DIN 439B, ISO 4035	1	000000000	000000

Left-Hand-Thread Thin-Profile Hex Nuts

These nuts tighten when turned to the left. Use them with left-hand rods and screws to prevent counterclockwise-moving parts from loosening. 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.

Black-Oxide Steel—Typically chosen for their appearance, these nuts have a dark, matte coating to create a finished look. They offer minimal corrosion resistance, so they're best for dry environments.

	Wd., mm	Ht., mm	Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Black-Oxide Steel



	M3 × 0.5 mm	5.5	1.8	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000


	M5 × 0.8 mm	8	2.7	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
	M6 × 0.75 mm	10	3.2	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
	M8 × 1 mm	13	4	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
	M8 × 1.25 mm	13	4	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
	M10 × 1.5 mm	17	5	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
	M12 × 1.75 mm	19	6	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
	M14 × 1.5 mm	22	7	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
	M16 × 1.5 mm	24	8	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
	M16 × 2 mm	24	8	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
	M18 × 2.5 mm	27	9	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000


	M20 × 2.5 mm	30	10	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000
	M22 × 1.5 mm	32	11	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000
	M22 × 2.5 mm	32	11	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000
	M24 × 1.5 mm	36	12	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000
	M30 × 1.5 mm	46	15	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000
	M30 × 2 mm	46	15	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000
	M33 × 3.5 mm	50	16.5	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000

Medium-Strength Steel with Material Certificate

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.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

	Wd., mm	Ht., mm	Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Black-Oxide Steel



	M5 × 0.5 mm	8	2.7	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000


	M10 × 1 mm	17	5	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
	M18 × 1.5 mm	27	9	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
	M20 × 1.5 mm	30	10	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000
	M27 × 1.5 mm	41	13.5	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000
	M27 × 2 mm	41	13.5	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000
	M30 × 3.5 mm	46	15	ISO Class 04	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000