L9 Nuts | McMaster-Carr

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Fastener Strength Grade/Class

SAE Grade 9

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Fastener Strength Rating

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Cadmium Yellow-Chromate Plated

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Thread Direction

Hex Nut Profile

Locking Type

Thread Spacing

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Thread Fit

Unified Standard Class 2B

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25 Products

About Hex Nuts

Choose a hex nut with the right profile, material, and strength for your application.

Hex Nuts

The most commonly used hex nuts, these are suitable for fastening most machinery and equipment.

Extreme-Strength Steel

These nuts are about 20% stronger than high-strength steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Cadmium Yellow-Chromate-Plated Steel— The plating creates a barrier against rust, so these nuts are suitable for most wet and outdoor environments. They also thread on smoothly without sticking.

	Wd.	Ht.	Fastener Strength Grade/Class	Pkg. Qty.		Pkg.
Cadmium Yellow-Chromate-Plated Steel



	1/4"-20	7/16"	17/64"	SAE Grade 9	50	000000000	000000


	1/4"-28	7/16"	17/64"	SAE Grade 9	50	000000000	00000
	5/16"-18	1/2"	5/16"	SAE Grade 9	25	000000000	0000
	5/16"-24	1/2"	5/16"	SAE Grade 9	25	000000000	0000
	3/8"-16	9/16"	25/64"	SAE Grade 9	25	000000000	00000
	3/8"-24	9/16"	25/64"	SAE Grade 9	25	000000000	00000
	7/16"-14	11/16"	7/16"	SAE Grade 9	10	000000000	0000
	7/16"-20	11/16"	7/16"	SAE Grade 9	10	000000000	0000
	1/2"-13	3/4"	17/32"	SAE Grade 9	10	000000000	0000
	1/2"-20	3/4"	17/32"	SAE Grade 9	10	000000000	0000
	5/8"-11	15/16"	11/16"	SAE Grade 9	5	000000000	0000


	5/8"-18	15/16"	11/16"	SAE Grade 9	5	000000000	0000
	3/4"-10	1 1/8"	25/32"	SAE Grade 9	1	000000000	0000
	3/4"-16	1 1/8"	25/32"	SAE Grade 9	1	000000000	0000
	7/8"-9	1 5/16"	55/64"	SAE Grade 9	1	000000000	0000
	7/8"-14	1 5/16"	55/64"	SAE Grade 9	1	000000000	0000
	1"-8	1 1/2"	1"	SAE Grade 9	1	000000000	00000
	1"-14	1 1/2"	1"	SAE Grade 9	1	000000000	00000

Top-Lock Distorted-Thread Locknuts

Irregularly shaped threads at the top of these locknuts grip the screw for a stronger hold than nylon-insert locknuts. Although the threads prevent the nut from backing out due to vibration, they also increase the effort to install and remove. To get these nuts off, you may need special tools, such as an impact wrench or propane torch. Nuts are not reusable.

Extreme-Strength Steel

About 20% stronger than high-strength steel locknuts, these Grade 9 nuts are the strongest we offer. Make sure to use them with Grade 9 screws to avoid stripped threads during installation.

Cadmium-Plated Steel—These locknuts have good lubricity to thread on smoothly and ease installation. The plating also creates a barrier against rust that's comparable to zinc-yellow-chromate plating.

	Wd.	Ht.	Fastener Strength Grade/Class	Pkg. Qty.		Pkg.
Cadmium-Plated Steel



	1/4"-20	7/16"	19/64"	SAE Grade 9	25	000000000	000000


	5/16"-18	1/2"	21/64"	SAE Grade 9	25	000000000	00000
	3/8"-16	9/16"	25/64"	SAE Grade 9	10	000000000	0000
	7/16"-14	11/16"	29/64"	SAE Grade 9	10	000000000	00000
	1/2"-13	3/4"	17/32"	SAE Grade 9	5	000000000	0000
	5/8"-11	15/16"	11/16"	SAE Grade 9	1	000000000	0000
	3/4"-10	1 1/8"	25/32"	SAE Grade 9	1	000000000	0000