DIN 6334 Nuts | McMaster-Carr

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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	10-49	50-Up
Zinc-Plated Steel



		M4 × 0.7 mm	12	7	Fully Threaded	DIN 6334	000000000	00000	00000	00000


		M5 × 0.8 mm	15	8	Fully Threaded	DIN 6334	000000000	0000	0000	0000
		M6 × 1 mm	18	10	Fully Threaded	DIN 6334	000000000	0000	0000	0000
		M8 × 1.25 mm	24	13	Fully Threaded	DIN 6334	000000000	0000	0000	0000
		M10 × 1.5 mm	30	17	Fully Threaded	DIN 6334	000000000	0000	0000	0000
		M12 × 1.75 mm	36	19	Fully Threaded	DIN 6334	000000000	0000	0000	0000
		M14 × 2 mm	42	22	Fully Threaded	DIN 6334	000000000	0000	0000	0000
		M16 × 2 mm	48	24	Fully Threaded	DIN 6334	000000000	0000	0000	0000
		M18 × 2.5 mm	54	27	Fully Threaded	DIN 6334	000000000	00000	00000	00000
		M20 × 2.5 mm	60	30	Fully Threaded	DIN 6334	000000000	0000	0000	0000
		M22 × 2.5 mm	66	32	Fully Threaded	DIN 6334	000000000	00000	00000	00000


		M24 × 3 mm	72	36	Fully Threaded	DIN 6334	000000000	00000	00000	00000
		M27 × 3 mm	81	41	Fully Threaded	DIN 6334	000000000	00000	00000	00000
		M30 × 3.5 mm	90	46	Fully Threaded	DIN 6334	000000000	000000	00000	00000
		M36 × 4 mm	108	55	Fully Threaded	DIN 6334	000000000	000000	00000	00000


		Black-Oxide Steel



				M18 × 2.5 mm	54	27	Fully Threaded	DIN 6334	000000000	00000	00000	00000


				M22 × 2.5 mm	66	32	Fully Threaded	DIN 6334	000000000	00000	00000	00000
				M27 × 3 mm	81	41	Fully Threaded	DIN 6334	000000000	00000	00000	00000
				M30 × 3.5 mm	90	46	Fully Threaded	DIN 6334	000000000	00000	00000	00000
				M36 × 4 mm	108	55	Fully Threaded	DIN 6334	000000000	000000	00000	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	10-49	50-Up
Zinc-Plated Steel



		M5 × 0.8 mm	15	8	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	000000	000000	00000


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


		M30 × 3.5 mm	90	46	Class 8	Fully Threaded	DIN 6334	000000000	00000	00000	00000


		Black-Oxide Steel



				M5 × 0.8 mm	15	8	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000	0000


				M6 × 1 mm	18	10	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000	00000
				M8 × 1.25 mm	24	13	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000	00000
				M10 × 1.5 mm	30	17	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000	00000
				M12 × 1.75 mm	36	19	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000	00000
				M14 × 2 mm	42	22	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000	00000
				M16 × 2 mm	48	24	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000	00000
				M18 × 2.5 mm	54	27	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000	00000
				M20 × 2.5 mm	60	30	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000	00000
				M24 × 3 mm	72	36	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000	00000
				M30 × 3.5 mm	90	46	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	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	10-49	50-Up
Zinc-Plated Steel



		M6 × 1 mm	18	10	Class 10	Fully Threaded	DIN 6334	000000000	00000	00000	00000


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


		Steel



				M8 × 1.25 mm	24	13	Class 10	Fully Threaded	DIN 6334	000000000	0000	0000	0000


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

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.

Highly 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	10-49	50-Up
18-8 Stainless Steel



		M5 × 0.8 mm	15	8	Fully Threaded	DIN 6334	000000000	00000	00000	00000


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


		M30 × 3.5 mm	90	46	Fully Threaded	ASME B18.2.2, DIN 6334	000000000	00000	00000	00000
		M33 × 3.5 mm	99	50	Fully Threaded	DIN 6334	000000000	000000	00000	00000
		M36 × 4 mm	108	55	Fully Threaded	DIN 6334	000000000	000000	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	0000


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


				Highly Corrosion-Resistant 316 Stainless Steel



						M5 × 0.8 mm	15	8	Fully Threaded	DIN 6334	000000000	0000	0000	0000


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