Grade 8 Steel Threaded Studs

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47 Products

Coupling Nuts

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

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



		M4 × 0.7 mm	12	7	ISO Class 8	Fully Threaded	—	000000000	000000	000000


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



				M4 × 0.7 mm	12	7	ISO Class 8	Fully Threaded	—	000000000	0000	0000


				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.

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



		1/4"-20	7/8"	1/2"	SAE Grade 8	Fully Threaded	000000000	000000	000000


		1/4"-28	7/8"	1/2"	SAE Grade 8	Fully Threaded	000000000	00000	00000
		5/16"-18	7/8"	1/2"	SAE Grade 8	Fully Threaded	000000000	00000	00000
		5/16"-24	7/8"	1/2"	SAE Grade 8	Fully Threaded	000000000	00000	00000
		3/8"-16	1 3/4"	5/8"	SAE Grade 8	Fully Threaded	000000000	00000	00000
		3/8"-24	1 3/4"	5/8"	SAE Grade 8	Fully Threaded	000000000	00000	00000
		7/16"-14	1 3/4"	3/4"	SAE Grade 8	Fully Threaded	000000000	00000	00000
		7/16"-20	1 3/4"	3/4"	SAE Grade 8	Fully Threaded	000000000	00000	00000
		1/2"-13	1 3/4"	3/4"	SAE Grade 8	Fully Threaded	000000000	00000	00000
		1/2"-20	1 3/4"	3/4"	SAE Grade 8	Fully Threaded	000000000	00000	00000
		5/8"-11	2 1/8"	15/16"	SAE Grade 8	Fully Threaded	000000000	00000	00000


		5/8"-18	2 1/8"	15/16"	SAE Grade 8	Fully Threaded	000000000	00000	00000
		3/4"-10	2 1/4"	1 1/8"	SAE Grade 8	Fully Threaded	000000000	00000	00000
		3/4"-16	2 1/4"	1 1/8"	SAE Grade 8	Fully Threaded	000000000	00000	00000
		7/8"-9	2 1/2"	1 5/16"	SAE Grade 8	Fully Threaded	000000000	00000	00000
		7/8"-14	2 1/2"	1 5/16"	SAE Grade 8	Fully Threaded	000000000	00000	00000
		1"-8	2 3/4"	1 1/2"	SAE Grade 8	Fully Threaded	000000000	00000	00000
		1"-14	2 3/4"	1 1/2"	SAE Grade 8	Fully Threaded	000000000	00000	00000
		1 1/4"-7	3"	1 7/8"	SAE Grade 8	Fully Threaded	000000000	00000	00000
		1 1/4"-12	3"	1 7/8"	SAE Grade 8	Fully Threaded	000000000	00000	00000
		1 1/2"-6	3 1/2"	2 1/4"	SAE Grade 8	Fully Threaded	000000000	00000	00000


		1 1/2"-12	3 1/2"	2 1/4"	SAE Grade 8	Fully Threaded	000000000	000000	00000