DIN 6334 Nuts | McMaster-Carr

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DIN 6334

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ISO Class 8

ISO Class 10

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Coupling Nut Profile

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90 Products

Coupling Nuts

Also known as extension nuts, these are commonly used to connect lengths of threaded rod and join threaded parts.

Low-Strength Steel

Rated Grade 2 or lower, these are about half as strong as medium-strength steel coupling nuts. Use them with threaded rods that have a comparable 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.

Black-Oxide Steel—A dark, matte coating creates a finished look. Nuts offer minimal corrosion resistance, so they're best for dry environments.

							Each
	Thread Size	Lg., mm	Wd., mm	Threading	Specs. Met		1-9	10-Up
Zinc-Plated Steel


		M4 × 0.7 mm	12	7	Fully Threaded	DIN 6334	000000000	00000	00000
		M5 × 0.8 mm	15	8	Fully Threaded	DIN 6334	000000000	0000	0000
		M6 × 1 mm	18	10	Fully Threaded	DIN 6334	000000000	0000	0000
		M8 × 1.25 mm	24	13	Fully Threaded	DIN 6334	000000000	0000	0000
		M10 × 1.5 mm	30	17	Fully Threaded	DIN 6334	000000000	0000	0000
		M12 × 1.75 mm	36	19	Fully Threaded	DIN 6334	000000000	0000	0000
		M14 × 2 mm	42	22	Fully Threaded	DIN 6334	000000000	0000	0000
		M16 × 2 mm	48	24	Fully Threaded	DIN 6334	000000000	0000	0000
		M18 × 2.5 mm	54	27	Fully Threaded	DIN 6334	000000000	00000	00000
		M20 × 2.5 mm	60	30	Fully Threaded	DIN 6334	000000000	0000	0000
		M22 × 2.5 mm	66	32	Fully Threaded	DIN 6334	000000000	00000	00000
		M24 × 3 mm	72	36	Fully Threaded	DIN 6334	000000000	00000	00000
		M27 × 3 mm	81	41	Fully Threaded	DIN 6334	000000000	00000	00000
		M30 × 3.5 mm	90	46	Fully Threaded	DIN 6334	000000000	000000	00000
		M36 × 4 mm	108	55	Fully Threaded	DIN 6334	000000000	000000	00000

		Black-Oxide Steel


				M18 × 2.5 mm	54	27	Fully Threaded	DIN 6334	000000000	00000	00000
				M22 × 2.5 mm	66	32	Fully Threaded	DIN 6334	000000000	00000	00000
				M27 × 3 mm	81	41	Fully Threaded	DIN 6334	000000000	00000	00000
				M30 × 3.5 mm	90	46	Fully Threaded	DIN 6334	000000000	00000	00000
				M36 × 4 mm	108	55	Fully Threaded	DIN 6334	000000000	000000	00000

Medium-Strength Steel

These Grade 5 or Class 8 nuts are about twice as strong as low-strength steel coupling nuts. Use them with threaded rods that have a comparable 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.

Black-Oxide Steel—A dark, matte coating creates a finished look. Nuts offer minimal corrosion resistance, so they're best for dry environments.

								Each
	Thread Size	Lg., mm	Wd., mm	Fastener Strength Grade/Class	Threading	Specs. Met		1-9	10-Up
Zinc-Plated Steel


		M5 × 0.8 mm	15	8	ISO Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	000000	000000
		M6 × 1 mm	18	10	ISO Class 8	Fully Threaded	DIN 6334	000000000	0000	0000
		M8 × 1.25 mm	24	13	ISO Class 8	Fully Threaded	DIN 6334	000000000	0000	0000
		M10 × 1.5 mm	30	17	ISO Class 8	Fully Threaded	DIN 6334	000000000	0000	0000
		M12 × 1.75 mm	36	19	ISO Class 8	Fully Threaded	DIN 6334	000000000	0000	0000
		M14 × 2 mm	42	22	ISO Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000
		M16 × 2 mm	48	24	ISO Class 8	Fully Threaded	DIN 6334	000000000	0000	0000
		M18 × 2.5 mm	54	27	ISO Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000
		M20 × 2.5 mm	60	30	ISO Class 8	Fully Threaded	DIN 6334	000000000	00000	0000
		M22 × 2.5 mm	66	32	ISO Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000
		M24 × 3 mm	72	36	ISO Class 8	Fully Threaded	DIN 6334	000000000	00000	00000
		M30 × 3.5 mm	90	46	ISO Class 8	Fully Threaded	DIN 6334	000000000	00000	00000

		Black-Oxide Steel


				M5 × 0.8 mm	15	8	ISO Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	0000
				M6 × 1 mm	18	10	ISO Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000
				M8 × 1.25 mm	24	13	ISO Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000
				M10 × 1.5 mm	30	17	ISO Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000
				M12 × 1.75 mm	36	19	ISO Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000
				M14 × 2 mm	42	22	ISO Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000
				M16 × 2 mm	48	24	ISO Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000
				M18 × 2.5 mm	54	27	ISO Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000
				M20 × 2.5 mm	60	30	ISO Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000
				M24 × 3 mm	72	36	ISO Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000
				M30 × 3.5 mm	90	46	ISO Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000

High-Strength Steel

Rated Grade 8 or Class 10, these are about 25% stronger than medium-strength steel coupling nuts. Use them with threaded rods that have a comparable 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.

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

								Each
	Thread Size	Lg., mm	Wd., mm	Fastener Strength Grade/Class	Threading	Specs. Met		1-9	10-Up
Zinc-Plated Steel


		M6 × 1 mm	18	10	ISO Class 10	Fully Threaded	DIN 6334	000000000	00000	00000
		M8 × 1.25 mm	24	13	ISO Class 10	Fully Threaded	DIN 6334	000000000	0000	0000
		M10 × 1.5 mm	30	17	ISO Class 10	Fully Threaded	DIN 6334	000000000	0000	0000
		M12 × 1.75 mm	36	19	ISO Class 10	Fully Threaded	DIN 6334	000000000	0000	0000
		M16 × 2 mm	48	24	ISO Class 10	Fully Threaded	DIN 6334	000000000	00000	00000
		M20 × 2.5 mm	60	30	ISO Class 10	Fully Threaded	DIN 6334	000000000	00000	00000
		M24 × 3 mm	72	36	ISO Class 10	Fully Threaded	DIN 6334	000000000	00000	00000
		M27 × 3 mm	81	41	ISO Class 10	Fully Threaded	DIN 6334	000000000	00000	00000
		M30 × 3.5 mm	90	46	ISO Class 10	Fully Threaded	DIN 6334	000000000	000000	00000

		Steel


				M8 × 1.25 mm	24	13	ISO Class 10	Fully Threaded	DIN 6334	000000000	0000	0000
				M10 × 1.5 mm	30	17	ISO Class 10	Fully Threaded	DIN 6334	000000000	0000	0000
				M12 × 1.75 mm	36	19	ISO Class 10	Fully Threaded	DIN 6334	000000000	0000	0000
				M16 × 2 mm	48	24	ISO Class 10	Fully Threaded	DIN 6334	000000000	0000	0000
				M20 × 2.5 mm	60	30	ISO Class 10	Fully Threaded	DIN 6334	000000000	00000	00000
				M24 × 3 mm	72	36	ISO Class 10	Fully Threaded	DIN 6334	000000000	00000	00000
				M30 × 3.5 mm	90	46	ISO Class 10	Fully Threaded	DIN 6334	000000000	00000	00000
				M36 × 4 mm	108	55	ISO Class 10	Fully Threaded	DIN 6334	000000000	000000	000000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these nuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

Black-Oxide 18-8 Stainless Steel—Typically chosen for their appearance, these nuts have a dark, matte coating to create a finished look. They resist rust in wet and outdoor environments, but won't hold up to the harsh chemicals that 316 stainless steel can.

Super-Corrosion-Resistant 316 Stainless Steel—The most corrosion-resistant stainless steel coupling nuts we offer, these hold up in just about any environment. They won't degrade from exposure to weather, salt water, and most chemicals.

							Each
	Thread Size	Lg., mm	Wd., mm	Threading	Specs. Met		1-9	10-Up
18-8 Stainless Steel


		M5 × 0.8 mm	15	8	Fully Threaded	DIN 6334	000000000	00000	00000
		M6 × 1 mm	18	10	Fully Threaded	DIN 6334	000000000	0000	0000
		M8 × 1.25 mm	24	13	Fully Threaded	DIN 6334	000000000	0000	0000
		M10 × 1.5 mm	30	17	Fully Threaded	DIN 6334	000000000	0000	0000
		M12 × 1.75 mm	36	19	Fully Threaded	DIN 6334	000000000	0000	0000
		M14 × 2 mm	42	22	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000
		M16 × 2 mm	48	24	Fully Threaded	DIN 6334	000000000	00000	00000
		M18 × 2.5 mm	54	27	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000
		M20 × 2.5 mm	60	30	Fully Threaded	DIN 6334	000000000	00000	00000
		M22 × 2.5 mm	66	32	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000
		M24 × 3 mm	72	36	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000
		M30 × 3.5 mm	90	46	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000
		M33 × 3.5 mm	99	50	Fully Threaded	DIN 6334	000000000	000000	00000
		M36 × 4 mm	108	55	Fully Threaded	DIN 6334	000000000	000000	000000

		Black-Oxide 18-8 Stainless Steel


				M5 × 0.8 mm	15	8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	0000	0000
				M6 × 1 mm	18	10	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	0000	0000
				M8 × 1.25 mm	24	13	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	0000
				M10 × 1.5 mm	30	17	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000
				M12 × 1.75 mm	36	19	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000
				M14 × 2 mm	42	22	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000

				Super-Corrosion-Resistant 316 Stainless Steel


						M5 × 0.8 mm	15	8	Fully Threaded	DIN 6334	000000000	0000	0000
						M6 × 1 mm	18	10	Fully Threaded	DIN 6334	000000000	0000	0000
						M8 × 1.25 mm	24	13	Fully Threaded	DIN 6334	000000000	0000	0000
						M10 × 1.5 mm	30	17	Fully Threaded	DIN 6334	000000000	0000	0000
						M12 × 1.75 mm	36	19	Fully Threaded	DIN 6334	000000000	00000	0000
						M14 × 2 mm	42	22	Fully Threaded	DIN 6334	000000000	00000	00000
						M16 × 2 mm	48	24	Fully Threaded	DIN 6334	000000000	00000	00000
						M18 × 2.5 mm	54	27	Fully Threaded	DIN 6334	000000000	00000	00000
						M20 × 2.5 mm	60	30	Fully Threaded	DIN 6334	000000000	00000	00000
						M24 × 3 mm	72	36	Fully Threaded	DIN 6334	000000000	00000	00000