Stover Locknuts | McMaster-Carr

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314 Products

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

High-Strength Steel

Rated Grade 8, Grade C, or Class 10, these locknuts are about 25% stronger than medium-strength steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Zinc-Yellow-Chromate-Plated Steel—With a more durable finish than clear zinc plating, these nuts are suitable for most wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

Black-Oxide Steel—Typically chosen for their appearance, these nuts have a dark, matte coating to create a finished look. They offer minimal corrosion resistance, so they're best for dry environments.

Black-Phosphate-Coated Steel—The dark coating creates both a finished appearance and a barrier against rust that's comparable to zinc yellow-chromate plating.

Zinc-Flake-Coated Steel—The most durable zinc coating, this multilayer finish resists wear for long-term rust protection. However, similar to zinc-yellow-chromate plating, it won't hold up to harsh chemicals like stainless steel can.

Steel—Best for dry environments since moisture will cause these nuts to rust.

	Thread Size	Wd.	Ht.	Fastener Strength Grade/Class	Pkg. Qty.		Pkg.
Zinc-Yellow-Chromate-Plated Steel



		1/4"-20	7/16"	7/32"	ASTM Grade C	50	000000000	00000


		1/4"-28	7/16"	7/32"	ASTM Grade C	50	000000000	0000
		5/16"-18	1/2"	17/64"	ASTM Grade C	50	000000000	0000
		5/16"-24	1/2"	17/64"	ASTM Grade C	50	000000000	0000
		3/8"-16	9/16"	21/64"	ASTM Grade C	25	000000000	0000
		3/8"-24	9/16"	21/64"	ASTM Grade C	25	000000000	0000
		7/16"-14	11/16"	3/8"	ASTM Grade C	25	000000000	0000
		7/16"-20	11/16"	3/8"	ASTM Grade C	25	000000000	0000
		1/2"-13	3/4"	7/16"	ASTM Grade C	10	000000000	0000
		1/2"-20	3/4"	7/16"	ASTM Grade C	10	000000000	0000
		9/16"-12	7/8"	31/64"	ASTM Grade C	10	000000000	0000


		9/16"-18	7/8"	31/64"	ASTM Grade C	10	000000000	0000
		5/8"-11	15/16"	35/64"	ASTM Grade C	5	000000000	0000
		5/8"-18	15/16"	35/64"	ASTM Grade C	5	000000000	0000
		3/4"-10	1 1/8"	41/64"	ASTM Grade C	5	000000000	0000
		3/4"-16	1 1/8"	41/64"	ASTM Grade C	5	000000000	0000
		7/8"-9	1 5/16"	3/4"	ASTM Grade C	1	000000000	0000
		7/8"-14	1 5/16"	3/4"	ASTM Grade C	1	000000000	0000
		1"-8	1 1/2"	55/64"	ASTM Grade C	1	000000000	0000
		1"-14	1 1/2"	55/64"	ASTM Grade C	1	000000000	0000
		M6 × 1 mm	10 mm	6 mm	ISO Class 10	100	000000000	00000


		M8 × 1 mm	13 mm	8 mm	ISO Class 10	10	000000000	0000
		M8 × 1.25 mm	13 mm	8 mm	ISO Class 10	50	000000000	00000
		M10 × 1.25 mm	17 mm	10 mm	ISO Class 10	10	000000000	0000
		M10 × 1.5 mm	17 mm	10 mm	ISO Class 10	25	000000000	00000
		M12 × 1.25 mm	19 mm	12 mm	ISO Class 10	5	000000000	00000
		M12 × 1.5 mm	19 mm	12 mm	ISO Class 10	5	000000000	00000
		M12 × 1.75 mm	19 mm	12 mm	ISO Class 10	10	000000000	0000
		M14 × 1.5 mm	22 mm	14 mm	ISO Class 10	5	000000000	00000
		M14 × 2 mm	22 mm	14 mm	ISO Class 10	10	000000000	0000
		M16 × 1.5 mm	24 mm	16 mm	ISO Class 10	1	000000000	0000


		M16 × 2 mm	24 mm	16 mm	ISO Class 10	10	000000000	00000
		M18 × 2.5 mm	27 mm	18 mm	ISO Class 10	5	000000000	00000
		M20 × 2.5 mm	30 mm	20 mm	ISO Class 10	5	000000000	00000
		M24 × 3 mm	36 mm	24 mm	ISO Class 10	1	000000000	0000


		Zinc-Plated Steel



				1/4"-20	7/16"	7/32"	ASTM Grade C	100	000000000	0000


				1/4"-28	7/16"	7/32"	ASTM Grade C	100	000000000	00000
				5/16"-18	1/2"	17/64"	ASTM Grade C	100	000000000	00000
				5/16"-24	1/2"	17/64"	ASTM Grade C	100	000000000	00000
				3/8"-16	9/16"	21/64"	ASTM Grade C	100	000000000	00000
				3/8"-24	9/16"	21/64"	ASTM Grade C	100	000000000	00000
				7/16"-14	11/16"	3/8"	ASTM Grade C	50	000000000	00000
				7/16"-20	11/16"	3/8"	ASTM Grade C	50	000000000	00000
				1/2"-13	3/4"	7/16"	ASTM Grade C	50	000000000	00000
				1/2"-20	3/4"	7/16"	ASTM Grade C	50	000000000	00000
9/16"-12				7/8"	31/64"	ASTM Grade C	25	000000000	00000


9/16"-18	7/8"			31/64"	ASTM Grade C	25	000000000	00000
5/8"-11	15/16"			35/64"	ASTM Grade C	25	000000000	00000
5/8"-18	15/16"			35/64"	ASTM Grade C	25	000000000	00000
3/4"-10	1 1/8"			41/64"	ASTM Grade C	10	000000000	0000
3/4"-16	1 1/8"			41/64"	ASTM Grade C	10	000000000	0000
7/8"-9	1 5/16"			3/4"	ASTM Grade C	10	000000000	00000
7/8"-14	1 5/16"			3/4"	ASTM Grade C	10	000000000	00000
1"-8	1 1/2"			55/64"	ASTM Grade C	5	000000000	00000
1"-14	1 1/2"			55/64"	ASTM Grade C	5	000000000	00000
1 1/8"-7	1 11/16"			1"	ASTM Grade C	1	000000000	0000


1 1/8"-12	1 11/16"			1"	ASTM Grade C	1	000000000	0000
1 1/4"-7	1 7/8"			1 3/32"	ASTM Grade C	1	000000000	0000
1 1/4"-12	1 7/8"			1 3/32"	ASTM Grade C	1	000000000	0000
1 1/2"-6	2 1/4"			1 5/16"	ASTM Grade C	1	000000000	0000
1 1/2"-12	2 1/4"			1 5/16"	ASTM Grade C	1	000000000	0000
M5 × 0.8 mm	8 mm			5.1 mm	ISO Class 10	100	000000000	0000
M6 × 1 mm	10 mm			6 mm	ISO Class 10	100	000000000	00000
M8 × 1 mm	13 mm			8 mm	ISO Class 10	50	000000000	00000
M8 × 1.25 mm	13 mm			8 mm	ISO Class 10	50	000000000	0000
M10 × 1 mm	17 mm			10 mm	ISO Class 10	25	000000000	00000


M10 × 1.25 mm	17 mm			10 mm	ISO Class 10	10	000000000	00000
M10 × 1.5 mm	17 mm			10 mm	ISO Class 10	25	000000000	00000
M12 × 1.25 mm	19 mm			12 mm	ISO Class 10	25	000000000	00000
M12 × 1.5 mm	19 mm			12 mm	ISO Class 10	10	000000000	00000
M12 × 1.75 mm	19 mm			12 mm	ISO Class 10	25	000000000	00000
M14 × 1.5 mm	22 mm			14 mm	ISO Class 10	10	000000000	0000
M14 × 2 mm	22 mm			14 mm	ISO Class 10	10	000000000	0000
M16 × 1.5 mm	24 mm			16 mm	ISO Class 10	10	000000000	00000
M16 × 2 mm	24 mm			16 mm	ISO Class 10	10	000000000	0000
M18 × 1.5 mm	27 mm			18 mm	ISO Class 10	5	000000000	0000


M18 × 2.5 mm	27 mm			18 mm	ISO Class 10	5	000000000	0000
M20 × 1.5 mm	30 mm			20 mm	ISO Class 10	5	000000000	00000
M20 × 2.5 mm	30 mm			20 mm	ISO Class 10	5	000000000	00000
M22 × 1.5 mm	32 mm			22 mm	ISO Class 10	5	000000000	00000
M22 × 2.5 mm	32 mm			22 mm	ISO Class 10	5	000000000	00000
M24 × 1.5 mm	36 mm			24 mm	ISO Class 10	1	000000000	0000
M24 × 3 mm	36 mm			24 mm	ISO Class 10	1	000000000	0000
M27 × 3 mm	41 mm			27 mm	ISO Class 10	1	000000000	0000
M30 × 2 mm	46 mm			30 mm	ISO Class 10	1	000000000	0000
M30 × 3.5 mm	46 mm			30 mm	ISO Class 10	1	000000000	0000


Black-Oxide Steel



		1/4"-20	7/16"	7/32"	ASTM Grade C	50	000000000	00000


		5/16"-18	1/2"	17/64"	ASTM Grade C	50	000000000	00000
		5/16"-24	1/2"	17/64"	ASTM Grade C	50	000000000	00000
		3/8"-16	9/16"	21/64"	ASTM Grade C	25	000000000	00000
		3/8"-24	9/16"	21/64"	ASTM Grade C	25	000000000	00000
		7/16"-14	11/16"	3/8"	ASTM Grade C	10	000000000	0000
		7/16"-20	11/16"	3/8"	ASTM Grade C	10	000000000	0000
		1/2"-13	3/4"	7/16"	ASTM Grade C	10	000000000	00000
		1/2"-20	3/4"	7/16"	ASTM Grade C	10	000000000	00000
		9/16"-12	7/8"	31/64"	ASTM Grade C	10	000000000	00000
		9/16"-18	7/8"	31/64"	ASTM Grade C	10	000000000	00000


		5/8"-11	15/16"	35/64"	ASTM Grade C	5	000000000	00000
		5/8"-18	15/16"	35/64"	ASTM Grade C	5	000000000	00000
		3/4"-10	1 1/8"	41/64"	ASTM Grade C	5	000000000	00000
		3/4"-16	1 1/8"	41/64"	ASTM Grade C	5	000000000	00000
		7/8"-9	1 5/16"	3/4"	ASTM Grade C	1	000000000	0000
		7/8"-14	1 5/16"	3/4"	ASTM Grade C	1	000000000	0000
		1"-8	1 1/2"	55/64"	ASTM Grade C	1	000000000	0000


		Black-Phosphate-Coated Steel



				M5 × 0.8 mm	8 mm	5.1 mm	ISO Class 10	50	000000000	00000


				M6 × 1 mm	10 mm	6 mm	ISO Class 10	25	000000000	0000
				M8 × 1 mm	13 mm	8 mm	ISO Class 10	10	000000000	0000
				M8 × 1.25 mm	13 mm	8 mm	ISO Class 10	25	000000000	00000
				M10 × 1.25 mm	17 mm	10 mm	ISO Class 10	5	000000000	00000
				M10 × 1.5 mm	17 mm	10 mm	ISO Class 10	10	000000000	00000
				M12 × 1.25 mm	19 mm	12 mm	ISO Class 10	5	000000000	00000
				M12 × 1.5 mm	19 mm	12 mm	ISO Class 10	5	000000000	00000
				M12 × 1.75 mm	19 mm	12 mm	ISO Class 10	5	000000000	0000
				M14 × 1.5 mm	22 mm	14 mm	ISO Class 10	5	000000000	00000
				M14 × 2 mm	22 mm	14 mm	ISO Class 10	5	000000000	00000


				M16 × 1.5 mm	24 mm	16 mm	ISO Class 10	1	000000000	0000
				M16 × 2 mm	24 mm	16 mm	ISO Class 10	5	000000000	00000
				M20 × 2.5 mm	30 mm	20 mm	ISO Class 10	1	000000000	0000
				M22 × 1.5 mm	33 mm	22 mm	ISO Class 10	1	000000000	0000
				M22 × 2.5 mm	33 mm	22 mm	ISO Class 10	1	000000000	0000


				Zinc-Flake-Coated Steel



						1/4"-20	7/16"	7/32"	ASTM Grade C	25	000000000	00000


						5/16"-18	1/2"	17/64"	ASTM Grade C	10	000000000	0000
						3/8"-16	9/16"	21/64"	ASTM Grade C	10	000000000	00000
						3/8"-24	9/16"	21/64"	ASTM Grade C	10	000000000	00000
						7/16"-14	11/16"	3/8"	ASTM Grade C	5	000000000	00000
7/16"-20						11/16"	3/8"	ASTM Grade C	5	000000000	00000
1/2"-13	3/4"					7/16"	ASTM Grade C	5	000000000	00000
1/2"-20	3/4"					7/16"	ASTM Grade C	5	000000000	00000
9/16"-18	7/8"					31/64"	ASTM Grade C	1	000000000	0000
5/8"-11	15/16"					35/64"	ASTM Grade C	1	000000000	0000
5/8"-18	15/16"					35/64"	ASTM Grade C	1	000000000	0000


3/4"-10	1 1/8"					41/64"	ASTM Grade C	1	000000000	0000
3/4"-16	1 1/8"					41/64"	ASTM Grade C	1	000000000	0000
1"-8	1 1/2"					55/64"	ASTM Grade C	1	000000000	00000


Cadmium-Plated Steel



						1/4"-20	7/16"	7/32"	ASTM Grade C	100	000000000	00000


						1/4"-28	7/16"	7/32"	ASTM Grade C	100	000000000	00000
						5/16"-18	1/2"	17/64"	ASTM Grade C	100	000000000	00000
						5/16"-24	1/2"	17/64"	ASTM Grade C	100	000000000	00000
						3/8"-16	9/16"	21/64"	ASTM Grade C	100	000000000	00000
						3/8"-24	9/16"	21/64"	ASTM Grade C	50	000000000	0000
						7/16"-14	11/16"	3/8"	ASTM Grade C	50	000000000	00000
						7/16"-20	11/16"	3/8"	ASTM Grade C	50	000000000	00000
						1/2"-13	3/4"	7/16"	ASTM Grade C	50	000000000	00000
						1/2"-20	3/4"	7/16"	ASTM Grade C	50	000000000	00000
		9/16"-12				7/8"	31/64"	ASTM Grade C	25	000000000	00000


		9/16"-18	7/8"			31/64"	ASTM Grade C	25	000000000	00000
		5/8"-11	15/16"			35/64"	ASTM Grade C	25	000000000	00000
		5/8"-18	15/16"			35/64"	ASTM Grade C	25	000000000	00000
		3/4"-10	1 1/8"			41/64"	ASTM Grade C	10	000000000	00000
		3/4"-16	1 1/8"			41/64"	ASTM Grade C	10	000000000	00000
		7/8"-9	1 5/16"			3/4"	ASTM Grade C	10	000000000	00000
		7/8"-14	1 5/16"			3/4"	ASTM Grade C	5	000000000	0000
		1"-8	1 1/2"			55/64"	ASTM Grade C	5	000000000	00000
		1"-14	1 1/2"			55/64"	ASTM Grade C	5	000000000	00000


		Steel



						1/4"-20	7/16"	7/32"	ASTM Grade C	100	000000000	0000


						1/4"-28	7/16"	7/32"	ASTM Grade C	100	000000000	0000
						5/16"-18	1/2"	17/64"	ASTM Grade C	100	000000000	0000
						5/16"-24	1/2"	17/64"	ASTM Grade C	100	000000000	0000
						3/8"-16	9/16"	21/64"	ASTM Grade C	100	000000000	0000
						3/8"-24	9/16"	21/64"	ASTM Grade C	100	000000000	0000
						7/16"-14	11/16"	3/8"	ASTM Grade C	50	000000000	0000
				7/16"-20		11/16"	3/8"	ASTM Grade C	50	000000000	0000
				1/2"-13	3/4"	7/16"	ASTM Grade C	50	000000000	00000
				1/2"-20	3/4"	7/16"	ASTM Grade C	50	000000000	00000
				9/16"-12	7/8"	31/64"	ASTM Grade C	25	000000000	0000


				9/16"-18	7/8"	31/64"	ASTM Grade C	25	000000000	0000
				5/8"-11	15/16"	35/64"	ASTM Grade C	25	000000000	00000
				5/8"-18	15/16"	35/64"	ASTM Grade C	25	000000000	00000
				3/4"-10	1 1/8"	41/64"	ASTM Grade C	10	000000000	0000
				3/4"-16	1 1/8"	41/64"	ASTM Grade C	10	000000000	0000
				7/8"-14	1 5/16"	3/4"	ASTM Grade C	10	000000000	00000
				1"-8	1 1/2"	55/64"	ASTM Grade C	5	000000000	0000

Medium-Strength Steel

These Grade 5 or Class 8 nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

	Thread Size	Wd.	Ht.	Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Yellow-Chromate-Plated Steel



		M36 × 4 mm	55 mm	36 mm	ISO Class 8	DIN 980V	1	000000000	00000


		Zinc-Plated Steel



				1/4"-20	7/16"	1/4"	SAE Grade 5	—	100	000000000	00000


				1/4"-28	7/16"	1/4"	SAE Grade 5	—	50	000000000	0000
				5/16"-18	1/2"	19/64"	SAE Grade 5	—	50	000000000	00000
				5/16"-24	1/2"	19/64"	SAE Grade 5	—	50	000000000	0000
				3/8"-16	9/16"	3/8"	SAE Grade 5	—	50	000000000	00000
				3/8"-24	9/16"	3/8"	SAE Grade 5	—	50	000000000	0000
				7/16"-14	11/16"	27/64"	SAE Grade 5	—	50	000000000	00000
				7/16"-20	11/16"	27/64"	SAE Grade 5	—	25	000000000	00000
				1/2"-13	3/4"	1/2"	SAE Grade 5	—	25	000000000	00000
				1/2"-20	3/4"	1/2"	SAE Grade 5	—	10	000000000	0000
				5/8"-11	15/16"	5/8"	SAE Grade 5	—	10	000000000	00000


				5/8"-18	15/16"	5/8"	SAE Grade 5	—	10	000000000	0000
				3/4"-10	1 1/8"	3/4"	SAE Grade 5	—	10	000000000	00000
				7/8"-9	1 5/16"	13/16"	SAE Grade 5	—	5	000000000	00000
				7/8"-14	1 5/16"	13/16"	SAE Grade 5	—	5	000000000	00000
				1"-8	1 1/2"	15/16"	SAE Grade 5	—	5	000000000	00000
				1"-14	1 1/2"	15/16"	SAE Grade 5	—	1	000000000	00000
				M3 × 0.5 mm	5.5 mm	3.7 mm	ISO Class 8	DIN 980V	50	000000000	00000
				M4 × 0.7 mm	7 mm	4.2 mm	ISO Class 8	DIN 980V	100	000000000	00000
				M5 × 0.8 mm	8 mm	5.1 mm	ISO Class 8	DIN 980V	100	000000000	00000
				M6 × 1 mm	10 mm	6 mm	ISO Class 8	DIN 980V	100	000000000	0000


				M8 × 1.25 mm	13 mm	8 mm	ISO Class 8	DIN 980V	50	000000000	0000
				M10 × 1.25 mm	17 mm	10 mm	ISO Class 8	DIN 980V	25	000000000	0000
				M10 × 1.5 mm	17 mm	10 mm	ISO Class 8	DIN 980V	25	000000000	0000
				M12 × 1.25 mm	19 mm	12 mm	ISO Class 8	DIN 980V	25	000000000	00000
				M12 × 1.5 mm	19 mm	12 mm	ISO Class 8	DIN 980V	10	000000000	00000
				M12 × 1.75 mm	19 mm	12 mm	ISO Class 8	DIN 980V	25	000000000	00000
				M14 × 1.5 mm	22 mm	14 mm	ISO Class 8	DIN 980V	10	000000000	00000
				M14 × 2 mm	22 mm	14 mm	ISO Class 8	DIN 980V	10	000000000	00000
				M16 × 1.5 mm	24 mm	16 mm	ISO Class 8	DIN 980V	5	000000000	00000
				M16 × 2 mm	24 mm	16 mm	ISO Class 8	DIN 980V	10	000000000	00000


				M18 × 1.5 mm	27 mm	18 mm	ISO Class 8	DIN 980V	1	000000000	0000
				M18 × 2.5 mm	27 mm	18 mm	ISO Class 8	DIN 980V	5	000000000	00000
				M20 × 1.5 mm	30 mm	20 mm	ISO Class 8	DIN 980V	1	000000000	0000
				M20 × 2.5 mm	30 mm	20 mm	ISO Class 8	DIN 980V	5	000000000	00000
				M24 × 1.5 mm	36 mm	24 mm	ISO Class 8	DIN 980V	1	000000000	0000
				M24 × 3 mm	36 mm	24 mm	ISO Class 8	DIN 980V	1	000000000	0000
				M27 × 3 mm	41 mm	27 mm	ISO Class 8	DIN 980V	1	000000000	0000
				M30 × 3.5 mm	46 mm	30 mm	ISO Class 8	DIN 980V	1	000000000	0000


				Black-Oxide Steel



						1/4"-20	7/16"	1/4"	SAE Grade 5	—	50	000000000	00000


1/4"-28	7/16"					1/4"	SAE Grade 5	—	50	000000000	0000
5/16"-18	1/2"					19/64"	SAE Grade 5	—	50	000000000	00000
5/16"-24	1/2"					19/64"	SAE Grade 5	—	50	000000000	00000
3/8"-16	9/16"					3/8"	SAE Grade 5	—	25	000000000	0000
3/8"-24	9/16"					3/8"	SAE Grade 5	—	50	000000000	00000
7/16"-14	11/16"	27/64"				SAE Grade 5	—	25	000000000	00000
7/16"-20	11/16"	27/64"	SAE Grade 5			—	25	000000000	00000
1/2"-13	3/4"	1/2"	SAE Grade 5			—	10	000000000	0000
1/2"-20	3/4"	1/2"	SAE Grade 5			—	10	000000000	00000
5/8"-11	15/16"	5/8"	SAE Grade 5			—	5	000000000	0000


5/8"-18	15/16"	5/8"	SAE Grade 5			—	10	000000000	00000
3/4"-10	1 1/8"	3/4"	SAE Grade 5			—	5	000000000	00000
7/8"-9	1 5/16"	13/16"	SAE Grade 5			—	1	000000000	00000
7/8"-14	1 5/16"	13/16"	SAE Grade 5			—	1	000000000	0000
1"-8	1 1/2"	15/16"	SAE Grade 5			—	1	000000000	0000
1"-14	1 1/2"	15/16"	SAE Grade 5			—	1	000000000	0000

Low-Strength Steel

Rated Grade 2, Class 6, or lower, these locknuts are about half as strong as medium-strength steel nuts. Use them with screws that have a similar 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.

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



	6-32	5/16"	7/64"	SAE Grade 2	100	000000000	000000


	8-32	11/32"	1/8"	SAE Grade 2	100	000000000	0000
	10-24	3/8"	1/8"	SAE Grade 2	100	000000000	00000
	10-32	3/8"	1/8"	SAE Grade 2	100	000000000	00000
	1/4"-20	7/16"	7/32"	SAE Grade 2	100	000000000	00000
	1/4"-28	7/16"	7/32"	SAE Grade 2	100	000000000	00000
	5/16"-18	1/2"	17/64"	SAE Grade 2	100	000000000	00000
	5/16"-24	1/2"	17/64"	SAE Grade 2	100	000000000	00000
	3/8"-16	9/16"	21/64"	SAE Grade 2	50	000000000	00000
	1/2"-13	3/4"	7/16"	SAE Grade 2	10	000000000	0000
	1/2"-20	3/4"	7/16"	SAE Grade 2	25	000000000	00000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

316 Stainless Steel—Our most corrosion-resistant nuts, these hold up in just about any environment. They won't degrade from exposure to weather, salt water, and most chemicals.

	Wd.	Ht.	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	6-32	5/16"	7/64"	—	50	000000000	00000


	8-32	11/32"	1/8"	—	50	000000000	0000
	10-24	3/8"	1/8"	—	50	000000000	0000
	10-32	3/8"	1/8"	—	50	000000000	0000
	1/4"-20	7/16"	7/32"	—	50	000000000	0000
	1/4"-28	7/16"	7/32"	—	25	000000000	0000
	5/16"-18	1/2"	17/64"	—	25	000000000	0000
	5/16"-24	1/2"	17/64"	—	25	000000000	0000
	3/8"-16	9/16"	21/64"	—	25	000000000	0000
	3/8"-24	9/16"	21/64"	—	10	000000000	0000
	7/16"-14	11/16"	3/8"	—	10	000000000	0000


	7/16"-20	11/16"	3/8"	—	5	000000000	0000
	1/2"-13	3/4"	7/16"	—	10	000000000	0000
	1/2"-20	3/4"	7/16"	—	5	000000000	0000
	5/8"-11	15/16"	35/64"	—	5	000000000	0000
	5/8"-18	15/16"	35/64"	—	1	000000000	0000
	3/4"-10	1 1/8"	41/64"	—	1	000000000	0000
	3/4"-16	1 1/8"	41/64"	—	1	000000000	0000
	1"-8	1 1/2"	55/64"	—	1	000000000	0000
	M4 × 0.7 mm	7 mm	3.2 mm	DIN 980, ISO 7042	25	000000000	00000
	M5 × 0.8 mm	8 mm	4 mm	DIN 980, ISO 7042	25	000000000	00000


	M6 × 1 mm	10 mm	6 mm	DIN 980, ISO 7042	10	000000000	0000
	M7 × 1 mm	11 mm	5.5 mm	DIN 980, ISO 7042	5	000000000	00000
	M8 × 1 mm	13 mm	6.4 mm	DIN 980, ISO 7042	5	000000000	00000
	M8 × 1.25 mm	13 mm	6.4 mm	DIN 980, ISO 7042	10	000000000	00000
	M10 × 1.25 mm	17 mm	10 mm	DIN 980, ISO 7042	1	000000000	0000
	M10 × 1.5 mm	17 mm	8 mm	DIN 980, ISO 7042	5	000000000	00000
	M12 × 1.75 mm	19 mm	12 mm	DIN 980, ISO 7042	1	000000000	0000
	M14 × 2 mm	22 mm	14 mm	DIN 980, ISO 7042	1	000000000	0000
	M16 × 1.5 mm	24 mm	16 mm	DIN 980, ISO 7042	1	000000000	00000
	M16 × 2 mm	24 mm	16 mm	DIN 980, ISO 7042	1	000000000	00000


	316 Stainless Steel



			8-32	11/32"	1/8"	—	10	000000000	0000


			10-24	3/8"	1/8"	—	10	000000000	0000
			10-32	3/8"	1/8"	—	10	000000000	0000
			1/4"-20	7/16"	7/32"	—	10	000000000	0000
			5/16"-18	1/2"	17/64"	—	10	000000000	0000
			3/8"-16	9/16"	21/64"	—	10	000000000	0000
			1/2"-13	3/4"	7/16"	—	5	000000000	0000

Distorted-Thread Flange Nuts

The strongest hold of all the flange nuts we offer, these have irregularly shaped threads that grip the screw to resist loosening. The threads prevent the nut from backing out due to high vibration, but 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, so they are not reusable. Nuts have a flange that distributes pressure evenly across the mounting surface without the need for a separate washer. They are ideal for securing screws in oversized or irregularly shaped holes since the flange covers a larger area than standard nuts. Also known as collar nuts.

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.

				Flange
	Thread Size	Wd.	Ht.	Dia.	Thk.	Pkg. Qty.		Pkg.
18-8 Stainless Steel



		6-32	5/16"	11/64"	0.422"	0.02"	5	000000000	00000


		8-32	11/32"	13/64"	0.469"	0.02"	5	000000000	0000
		10-24	3/8"	7/32"	0.5"	0.03"	5	000000000	0000
		10-32	3/8"	7/32"	0.5"	0.03"	5	000000000	0000
		12-24	7/16"	15/64"	0.594"	0.04"	5	000000000	00000
		1/4"-20	7/16"	15/64"	0.594"	0.04"	10	000000000	0000
		1/4"-28	7/16"	15/64"	0.594"	0.04"	1	000000000	0000
		5/16"-18	1/2"	9/32"	0.68"	0.04"	10	000000000	0000
		3/8"-16	9/16"	11/32"	0.75"	0.04"	10	000000000	0000
		3/8"-24	9/16"	11/32"	0.75"	0.04"	1	000000000	0000
		1/2"-13	3/4"	29/64"	1.031"	0.04"	5	000000000	00000


		1/2"-20	3/4"	29/64"	1.031"	0.05"	1	000000000	0000

Self-Aligning Press-Fit Locknuts for Sheet Metal

Fasten together unaligned parts and keep screws in place. The threaded hole within these press-fit nuts shifts up to .01" in any direction, so you can fasten together thin panels with off-center holes. The irregularly shaped threads tightly grip screws to prevent them from loosening or backing out under vibration.

18-8 Stainless Steel—The choice for wet and outdoor environments, these nuts resist rust and mild chemicals.

					Head		Barrel
	Thread Size	Drill Bit Size	For Min. Panel Thk.	For Maximum Panel Hardness	OD	Ht.	Dia.	Ht.	PEM® Part No.	Pkg. Qty.		Pkg.
Distorted-Thread Locking







				18-8 Stainless Steel

				4-40	L	0.038"	Brinell 125, Rockwell B70	0.36"	0.038"	9/64"	3/16"	LAC-440-1MD	5	000000000	00000


				4-40	L	0.054"	Brinell 125, Rockwell B70	0.36"	0.054"	9/64"	3/16"	LAC-440-2MD	5	000000000	0000
				6-32	21/64"	0.038"	Brinell 125, Rockwell B70	0.39"	0.038"	3/16"	13/64"	LAC-632-1MD	5	000000000	00000
				6-32	21/64"	0.054"	Brinell 125, Rockwell B70	0.39"	0.054"	3/16"	13/64"	LAC-632-2MD	5	000000000	00000
				8-32	U	0.038"	Brinell 125, Rockwell B70	0.44"	0.038"	15/64"	13/64"	LAC-832-1MD	5	000000000	00000
				8-32	U	0.054"	Brinell 125, Rockwell B70	0.44"	0.054"	15/64"	13/64"	LAC-832-2MD	5	000000000	00000
				10-24	13/32"	0.054"	Brinell 125, Rockwell B70	0.47"	0.054"	7/32"	17/64"	LAC-024-2MD	5	000000000	00000
				10-32	13/32"	0.038"	Brinell 125, Rockwell B70	0.47"	0.038"	7/32"	17/64"	LAC-032-1MD	5	000000000	00000
				10-32	13/32"	0.054"	Brinell 125, Rockwell B70	0.47"	0.054"	17/64"	17/64"	LAC-032-2MD	5	000000000	00000
				1/4"-20	33/64"	0.054"	Brinell 125, Rockwell B70	0.6"	0.054"	11/32"	5/16"	LAC-0420-2MD	1	000000000	0000
				M3 x 0.5 mm	7.4 mm	0.97 mm	Brinell 125, Rockwell B70	9.14 mm	0.97 mm	4.2 mm	4.8 mm	LAC-M3-1MD	5	000000000	00000


				M3 x 0.5 mm	7.4 mm	1.38 mm	Brinell 125, Rockwell B70	9.14 mm	1.38 mm	3.6 mm	4.8 mm	LAC-M3-2MD	5	000000000	00000
				M4 x 0.7 mm	9.4 mm	0.97 mm	Brinell 125, Rockwell B70	11.18 mm	0.97 mm	4.8 mm	5.3 mm	LAC-M4-1MD	5	000000000	00000
				M4 x 0.7 mm	9.4 mm	1.38 mm	Brinell 125, Rockwell B70	11.18 mm	1.38 mm	4.8 mm	5.3 mm	LAC-M4-2MD	5	000000000	00000
				M5 x 0.8 mm	10.3 mm	0.97 mm	Brinell 125, Rockwell B70	11.94 mm	0.97 mm	6 mm	6.9 mm	LAC-M5-1MD	5	000000000	00000
				M5 x 0.8 mm	10.3 mm	1.38 mm	Brinell 125, Rockwell B70	11.94 mm	1.38 mm	6 mm	6.9 mm	LAC-M5-2MD	5	000000000	00000
				M6 x 1 mm	13.1 mm	1.38 mm	Brinell 125, Rockwell B70	15.24 mm	1.38 mm	7.2 mm	7.9 mm	LAC-M6-2MD	1	000000000	0000