Grade 8 Steel Coupling Nuts

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Coupling

Fastener Strength Grade/Class

Class 8

SAE Grade 8

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Steel

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Fastener Strength Rating

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Finish

Thread Spacing

Thread Direction

Thread Type

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Coupling Nut Profile

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Unified Standard Class 2B

Specifications Met

ASME B18.2.2

DIN 6334

DFARS Specialty Metals

REACH

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

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EAR99

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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	10-49	50-Up
Zinc-Plated Steel



		M4 × 0.7 mm	12	7	Class 8	Fully Threaded	—	90009A229	000000	000000	000000


		M5 × 0.8 mm	15	8	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	90009A231	00000	00000	0000
		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	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	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



				M4 × 0.7 mm	12	7	Class 8	Fully Threaded	—	90082A111	00000	0000	0000


				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	90082A113	00000	00000	00000
				M8 × 1.25 mm	24	13	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	90082A114	00000	00000	00000
				M10 × 1.5 mm	30	17	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	90082A115	00000	00000	00000
				M12 × 1.75 mm	36	19	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	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	90082A118	00000	00000	00000
				M18 × 2.5 mm	54	27	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	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	90082A123	00000	00000	00000


				M30 × 3.5 mm	90	46	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	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.

							Each
	Thread Size	Lg.	Wd.	Fastener Strength Grade/Class	Threading		1-9	10-49	50-Up
Zinc-Plated Steel



		1/4"-20	7/8"	1/2"	SAE Grade 8	Fully Threaded	90983A205	000000	000000	000000


		1/4"-28	7/8"	1/2"	SAE Grade 8	Fully Threaded	90983A261	00000	00000	00000
		5/16"-18	7/8"	1/2"	SAE Grade 8	Fully Threaded	90983A206	00000	00000	00000
		5/16"-24	7/8"	1/2"	SAE Grade 8	Fully Threaded	90983A207	00000	00000	00000
		3/8"-16	1 3/4"	5/8"	SAE Grade 8	Fully Threaded	90983A211	00000	00000	00000
		3/8"-24	1 3/4"	5/8"	SAE Grade 8	Fully Threaded	90983A212	00000	00000	00000
		7/16"-14	1 3/4"	3/4"	SAE Grade 8	Fully Threaded	90983A213	00000	00000	00000
		7/16"-20	1 3/4"	3/4"	SAE Grade 8	Fully Threaded	90983A214	00000	00000	00000
		1/2"-13	1 3/4"	3/4"	SAE Grade 8	Fully Threaded	90983A217	00000	00000	00000
		1/2"-20	1 3/4"	3/4"	SAE Grade 8	Fully Threaded	90983A218	00000	00000	00000
		5/8"-11	2 1/8"	15/16"	SAE Grade 8	Fully Threaded	90983A223	00000	00000	00000


		5/8"-18	2 1/8"	15/16"	SAE Grade 8	Fully Threaded	90983A224	00000	00000	00000
		3/4"-10	2 1/4"	1 1/8"	SAE Grade 8	Fully Threaded	90983A229	00000	00000	00000
		3/4"-16	2 1/4"	1 1/8"	SAE Grade 8	Fully Threaded	90983A230	00000	00000	00000
		7/8"-9	2 1/2"	1 5/16"	SAE Grade 8	Fully Threaded	90983A234	00000	00000	00000
		7/8"-14	2 1/2"	1 5/16"	SAE Grade 8	Fully Threaded	90983A235	00000	00000	00000
		1"-8	2 3/4"	1 1/2"	SAE Grade 8	Fully Threaded	90983A240	00000	00000	00000
		1"-14	2 3/4"	1 1/2"	SAE Grade 8	Fully Threaded	90983A241	00000	00000	00000
		1 1/4"-7	3"	1 7/8"	SAE Grade 8	Fully Threaded	90983A246	00000	00000	00000
		1 1/4"-12	3"	1 7/8"	SAE Grade 8	Fully Threaded	90983A262	00000	00000	00000
		1 1/2"-6	3 1/2"	2 1/4"	SAE Grade 8	Fully Threaded	90983A251	00000	00000	00000


		1 1/2"-12	3 1/2"	2 1/4"	SAE Grade 8	Fully Threaded	90983A263	000000	00000	00000