DIN 6334 Nuts | McMaster-Carr

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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	93355A310	00000	00000	00000


		M5 × 0.8 mm	15	8	Fully Threaded	DIN 6334	93355A320	0000	0000	0000
		M6 × 1 mm	18	10	Fully Threaded	DIN 6334	93355A330	0000	0000	0000
		M8 × 1.25 mm	24	13	Fully Threaded	DIN 6334	93355A340	0000	0000	0000
		M10 × 1.5 mm	30	17	Fully Threaded	DIN 6334	93355A350	0000	0000	0000
		M12 × 1.75 mm	36	19	Fully Threaded	DIN 6334	93355A360	0000	0000	0000
		M14 × 2 mm	42	22	Fully Threaded	DIN 6334	93355A370	0000	0000	0000
		M16 × 2 mm	48	24	Fully Threaded	DIN 6334	93355A380	0000	0000	0000
		M18 × 2.5 mm	54	27	Fully Threaded	DIN 6334	93355A550	00000	00000	00000
		M20 × 2.5 mm	60	30	Fully Threaded	DIN 6334	93355A390	0000	0000	0000
		M22 × 2.5 mm	66	32	Fully Threaded	DIN 6334	93355A560	00000	00000	00000


		M24 × 3 mm	72	36	Fully Threaded	DIN 6334	93355A410	00000	00000	00000
		M27 × 3 mm	81	41	Fully Threaded	DIN 6334	93355A570	00000	00000	00000
		M30 × 3.5 mm	90	46	Fully Threaded	DIN 6334	93355A580	000000	00000	00000
		M36 × 4 mm	108	55	Fully Threaded	DIN 6334	93355A590	000000	00000	00000


		Black-Oxide Steel



				M18 × 2.5 mm	54	27	Fully Threaded	DIN 6334	93020A107	00000	00000	00000


				M22 × 2.5 mm	66	32	Fully Threaded	DIN 6334	93020A108	00000	00000	00000
				M27 × 3 mm	81	41	Fully Threaded	DIN 6334	93020A109	00000	00000	00000
				M30 × 3.5 mm	90	46	Fully Threaded	DIN 6334	93020A111	000000	00000	00000
				M36 × 4 mm	108	55	Fully Threaded	DIN 6334	93020A112	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	Certificate Type		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	—	90009A231	000000	000000	00000


		M6 × 1 mm	18	10	Class 8	Fully Threaded	DIN 6334	—	90009A221	0000	0000	0000
		M8 × 1.25 mm	24	13	Class 8	Fully Threaded	DIN 6334	—	90009A222	0000	0000	0000
		M10 × 1.5 mm	30	17	Class 8	Fully Threaded	DIN 6334	—	90009A223	0000	0000	0000
		M12 × 1.75 mm	36	19	Class 8	Fully Threaded	DIN 6334	—	90009A224	0000	0000	0000
		M14 × 2 mm	42	22	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	—	90009A232	00000	00000	00000
		M16 × 2 mm	48	24	Class 8	Fully Threaded	DIN 6334	—	90009A225	0000	0000	0000
		M18 × 2.5 mm	54	27	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	Material Certificate	90009A233	00000	00000	00000
		M20 × 2.5 mm	60	30	Class 8	Fully Threaded	DIN 6334	—	90009A226	00000	0000	0000
		M22 × 2.5 mm	66	32	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	Material Certificate	90009A234	00000	00000	00000
		M24 × 3 mm	72	36	Class 8	Fully Threaded	DIN 6334	—	90009A227	00000	00000	00000


		M30 × 3.5 mm	90	46	Class 8	Fully Threaded	DIN 6334	—	90009A228	00000	00000	00000


		Black-Oxide Steel



				M5 × 0.8 mm	15	8	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	—	90082A112	00000	00000	0000


				M6 × 1 mm	18	10	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	Material Certificate	90082A113	00000	00000	00000
				M8 × 1.25 mm	24	13	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	Material Certificate	90082A114	00000	00000	00000
				M10 × 1.5 mm	30	17	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	Material Certificate	90082A115	00000	00000	00000
				M12 × 1.75 mm	36	19	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	Material Certificate	90082A116	00000	00000	00000
				M14 × 2 mm	42	22	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	—	90082A117	00000	00000	00000
				M16 × 2 mm	48	24	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	Material Certificate	90082A118	00000	00000	00000
				M18 × 2.5 mm	54	27	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	Material Certificate	90082A119	00000	00000	00000
				M20 × 2.5 mm	60	30	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	—	90082A121	00000	00000	00000
				M24 × 3 mm	72	36	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	Material Certificate	90082A123	00000	00000	00000
				M30 × 3.5 mm	90	46	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	Material Certificate	90082A125	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	Certificate Type		1-9	10-49	50-Up
Zinc-Plated Steel



		M6 × 1 mm	18	10	Class 10	Fully Threaded	DIN 6334	—	90331A551	00000	00000	00000


		M8 × 1.25 mm	24	13	Class 10	Fully Threaded	DIN 6334	—	90331A552	0000	0000	0000
		M10 × 1.5 mm	30	17	Class 10	Fully Threaded	DIN 6334	—	90331A553	0000	0000	0000
		M12 × 1.75 mm	36	19	Class 10	Fully Threaded	DIN 6334	—	90331A554	0000	0000	0000
		M16 × 2 mm	48	24	Class 10	Fully Threaded	DIN 6334	—	90331A556	00000	00000	00000
		M20 × 2.5 mm	60	30	Class 10	Fully Threaded	DIN 6334	—	90331A557	00000	00000	00000
		M24 × 3 mm	72	36	Class 10	Fully Threaded	DIN 6334	—	90331A558	00000	00000	00000
		M27 × 3 mm	81	41	Class 10	Fully Threaded	DIN 6334	—	90331A559	00000	00000	00000
		M30 × 3.5 mm	90	46	Class 10	Fully Threaded	DIN 6334	Material Certificate	90331A555	000000	00000	00000


		Steel



				M8 × 1.25 mm	24	13	Class 10	Fully Threaded	DIN 6334	—	97778A110	0000	0000	0000


				M10 × 1.5 mm	30	17	Class 10	Fully Threaded	DIN 6334	Material Certificate	97778A120	0000	0000	0000
				M12 × 1.75 mm	36	19	Class 10	Fully Threaded	DIN 6334	—	97778A130	0000	0000	0000
				M16 × 2 mm	48	24	Class 10	Fully Threaded	DIN 6334	—	97778A140	0000	0000	0000
				M20 × 2.5 mm	60	30	Class 10	Fully Threaded	DIN 6334	—	97778A150	00000	00000	00000
				M24 × 3 mm	72	36	Class 10	Fully Threaded	DIN 6334	Material Certificate	97778A160	00000	00000	00000
				M30 × 3.5 mm	90	46	Class 10	Fully Threaded	DIN 6334	—	97778A170	00000	00000	00000
				M36 × 4 mm	108	55	Class 10	Fully Threaded	DIN 6334	—	97778A180	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	Certificate Type		1-9	10-49	50-Up
18-8 Stainless Steel



		M5 × 0.8 mm	15	8	Fully Threaded	DIN 6334	—	93590A105	00000	00000	00000


		M6 × 1 mm	18	10	Fully Threaded	DIN 6334	—	93590A106	0000	0000	0000
		M8 × 1.25 mm	24	13	Fully Threaded	DIN 6334	—	93590A107	0000	0000	0000
		M10 × 1.5 mm	30	17	Fully Threaded	DIN 6334	Material Certificate	93590A108	0000	0000	0000
		M12 × 1.75 mm	36	19	Fully Threaded	DIN 6334	Material Certificate	93590A109	0000	0000	0000
		M14 × 2 mm	42	22	Fully Threaded	ASME B18.2.2, DIN 6334	—	93590A311	00000	00000	00000
		M16 × 2 mm	48	24	Fully Threaded	DIN 6334	—	93590A112	00000	00000	0000
		M18 × 2.5 mm	54	27	Fully Threaded	ASME B18.2.2, DIN 6334	—	93590A312	00000	00000	00000
		M20 × 2.5 mm	60	30	Fully Threaded	DIN 6334	Material Certificate	93590A113	00000	00000	00000
		M22 × 2.5 mm	66	32	Fully Threaded	ASME B18.2.2, DIN 6334	—	93590A313	00000	00000	00000
		M24 × 3 mm	72	36	Fully Threaded	ASME B18.2.2, DIN 6334	—	93590A314	00000	00000	00000


		M30 × 3.5 mm	90	46	Fully Threaded	ASME B18.2.2, DIN 6334	—	93590A316	00000	00000	00000
		M33 × 3.5 mm	99	50	Fully Threaded	DIN 6334	Material Certificate	93590A336	000000	00000	00000
		M36 × 4 mm	108	55	Fully Threaded	DIN 6334	—	93590A337	000000	000000	000000


		Black-Oxide 18-8 Stainless Steel



				M5 × 0.8 mm	15	8	Fully Threaded	ASME B18.2.2, DIN 6334	—	93590A322	0000	0000	0000


				M6 × 1 mm	18	10	Fully Threaded	ASME B18.2.2, DIN 6334	—	93590A323	0000	0000	0000
				M8 × 1.25 mm	24	13	Fully Threaded	ASME B18.2.2, DIN 6334	—	93590A324	00000	0000	0000
				M10 × 1.5 mm	30	17	Fully Threaded	ASME B18.2.2, DIN 6334	—	93590A325	00000	00000	00000
				M12 × 1.75 mm	36	19	Fully Threaded	ASME B18.2.2, DIN 6334	Material Certificate	93590A326	00000	00000	00000
				M14 × 2 mm	42	22	Fully Threaded	ASME B18.2.2, DIN 6334	Material Certificate	93590A327	00000	00000	00000


				Highly Corrosion-Resistant 316 Stainless Steel



						M5 × 0.8 mm	15	8	Fully Threaded	DIN 6334	—	90111A331	0000	0000	0000


						M6 × 1 mm	18	10	Fully Threaded	DIN 6334	—	90111A332	0000	0000	0000
						M8 × 1.25 mm	24	13	Fully Threaded	DIN 6334	—	90111A333	0000	0000	0000
						M10 × 1.5 mm	30	17	Fully Threaded	DIN 6334	—	90111A334	0000	0000	0000
						M12 × 1.75 mm	36	19	Fully Threaded	DIN 6334	—	90111A335	00000	0000	0000
						M14 × 2 mm	42	22	Fully Threaded	DIN 6334	Material Certificate	90111A341	00000	00000	00000
						M16 × 2 mm	48	24	Fully Threaded	DIN 6334	—	90111A336	00000	00000	00000
						M18 × 2.5 mm	54	27	Fully Threaded	DIN 6334	Material Certificate	90111A337	00000	00000	00000
						M20 × 2.5 mm	60	30	Fully Threaded	DIN 6334	Material Certificate	90111A338	00000	00000	00000
						M24 × 3 mm	72	36	Fully Threaded	DIN 6334	Material Certificate	90111A340	00000	00000	00000