High-Collar Lock Washers

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Zinc Yellow-Chromate Plated

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DFARS Specialty Metals

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Export Control Classification Number (ECCN)

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156 Products

Split Lock Washers for Socket Head Screws

Stop socket head screws from loosening due to mild vibration. These washers have a small diameter to fit under screws with narrow heads, but are still thick enough to keep fasteners secure. While they're not as vibration resistant as other lock washers, they are a great fit for electrical panels, light fixtures, and other light duty assemblies. Split lock washers are not reusable, and they only work with fasteners that have right-hand threads. Also known as high-collar lock washers.

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

Black-Oxide 18-8 Stainless Steel—Typically chosen for their appearance, these washers have a dark, matte coating to create a finished look. They won't rust in wet and outdoor environments, but can't hold up to harsh chemicals as well as 316 stainless steel.

Highly-Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these washers won't degrade when exposed to harsh weather, salt water, and most chemicals.

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

Zinc-Yellow-Chromate-Plated Steel—With the same corrosion resistance as zinc-plated steel, these withstand occasional exposure to moisture.

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

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

	For Screw Size	ID	OD	Thk.	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel



		No. 2	0.094"	0.142"	0.022"	—	100	000000000	00000


		No. 4	0.120"	0.173"	0.022"	ASME B18.21.1	100	000000000	0000
		No. 5	0.133"	0.202"	0.030"	ASME B18.21.1	100	000000000	0000
		No. 6	0.148"	0.216"	0.030"	ASME B18.21.1	100	000000000	0000
		No. 8	0.174"	0.267"	0.047"	ASME B18.21.1	100	000000000	0000
		No. 10	0.200"	0.294"	0.047"	ASME B18.21.1	100	000000000	0000
		No. 12	0.227"	0.331"	0.078"	—	100	000000000	0000
		1/4"	0.260"	0.363"	0.078"	ASME B18.21.1	100	000000000	0000
		5/16"	0.322"	0.457"	0.093"	ASME B18.21.1	50	000000000	0000
		3/8"	0.385"	0.550"	0.125"	ASME B18.21.1	50	000000000	00000
		7/16"	0.450"	0.644"	0.140"	ASME B18.21.1	50	000000000	00000


		1/2"	0.512"	0.733"	0.172"	ASME B18.21.1	25	000000000	0000
		5/8"	0.641"	0.917"	0.203"	ASME B18.21.1	10	000000000	0000
		3/4"	0.766"	1.105"	0.218"	ASME B18.21.1	10	000000000	00000
		7/8"	0.894"	1.291"	0.234"	ASME B18.21.1	5	000000000	00000
		1"	1.024"	1.478"	0.250"	ASME B18.21.1	1	000000000	0000
		M3	3.4 mm	5.6 mm	0.9 mm to 1.1 mm	DIN 7980	100	000000000	0000
		M3.5	3.9 mm	6.1 mm	0.9 mm to 1.1 mm	DIN 7980	100	000000000	0000
		M4	4.4 mm	7.0 mm	1.1 mm to 1.3 mm	DIN 7980	100	000000000	0000
		M5	5.4 mm	8.8 mm	1.5 mm to 1.7 mm	DIN 7980	100	000000000	0000
		M6	6.5 mm	9.9 mm	1.5 mm to 1.7 mm	DIN 7980	100	000000000	0000


		M8	8.5 mm	12.7 mm	1.9 mm to 2.1 mm	DIN 7980	100	000000000	0000
		M10	10.7 mm	16.0 mm	2.3 mm to 2.7 mm	DIN 7980	100	000000000	00000
		M12	12.7 mm	18.0 mm	2.3 mm to 2.7 mm	DIN 7980	50	000000000	0000
		M14	14.7 mm	21.1 mm	2.8 mm to 3.2 mm	DIN 7980	10	000000000	0000
		M16	17.0 mm	24.4 mm	3.3 mm to 3.7 mm	DIN 7980	10	000000000	0000
		M18	19.0 mm	26.4 mm	3.3 mm to 3.7 mm	DIN 7980	10	000000000	0000
		M20	21.2 mm	30.6 mm	4.3 mm to 4.7 mm	DIN 7980	10	000000000	00000
		M22	23.5 mm	32.9 mm	4.3 mm to 4.7 mm	DIN 7980	5	000000000	00000
		M24	25.5 mm	35.9 mm	4.8 mm to 5.2 mm	DIN 7980	5	000000000	0000
		M30	31.7 mm	44.1 mm	5.8 mm to 6.2 mm	DIN 7980	1	000000000	00000


		Black-Oxide 18-8 Stainless Steel



				No. 4	0.120"	0.173"	0.022"	ASME B18.21.1	100	000000000	00000


				No. 6	0.148"	0.216"	0.030"	ASME B18.21.1	100	000000000	00000
				No. 8	0.174"	0.267"	0.047"	ASME B18.21.1	100	000000000	00000
				No. 10	0.200"	0.294"	0.047"	ASME B18.21.1	50	000000000	0000
				1/4"	0.260"	0.363"	0.078"	ASME B18.21.1	50	000000000	00000
				5/16"	0.322"	0.457"	0.093"	ASME B18.21.1	25	000000000	0000
				3/8"	0.385"	0.550"	0.125"	ASME B18.21.1	10	000000000	0000
				1/2"	0.512"	0.733"	0.172"	ASME B18.21.1	10	000000000	0000
				5/8"	0.641"	0.917"	0.203"	ASME B18.21.1	5	000000000	00000
				3/4"	0.766"	1.105"	0.218"	ASME B18.21.1	1	000000000	0000


				Highly-Corrosion-Resistant 316 Stainless Steel



No. 2						0.094"	0.142"	0.022"	—	100	000000000	0000


No. 4	0.120"					0.173"	0.022"	ASME B18.21.1	100	000000000	0000
No. 5	0.133"					0.202"	0.030"	ASME B18.21.1	100	000000000	0000
No. 6	0.148"					0.216"	0.030"	ASME B18.21.1	100	000000000	0000
No. 8	0.174"					0.267"	0.047"	ASME B18.21.1	100	000000000	0000
No. 10	0.200"					0.294"	0.047"	ASME B18.21.1	100	000000000	0000
1/4"	0.260"					0.363"	0.078"	ASME B18.21.1	100	000000000	0000
5/16"	0.322"					0.457"	0.093"	ASME B18.21.1	50	000000000	0000
3/8"	0.385"					0.550"	0.125"	ASME B18.21.1	50	000000000	00000
7/16"	0.450"					0.644"	0.140"	ASME B18.21.1	25	000000000	00000
1/2"	0.512"					0.733"	0.172"	ASME B18.21.1	10	000000000	0000


5/8"	0.641"					0.917"	0.203"	ASME B18.21.1	10	000000000	00000
3/4"	0.766"					1.105"	0.218"	ASME B18.21.1	5	000000000	0000
7/8"	0.894"					1.291"	0.234"	ASME B18.21.1	1	000000000	0000
1"	1.024"					1.478"	0.250"	ASME B18.21.1	1	000000000	0000
1 1/4"	1.280"					1.790"	0.313"	ASME B18.21.1	1	000000000	0000
1 1/2"	1.534"					2.159"	0.375"	ASME B18.21.1	1	000000000	00000
M3	3.4 mm					5.6 mm	0.9 mm to 1.1 mm	DIN 7980	100	000000000	0000
M4	4.4 mm					7.0 mm	1.1 mm to 1.3 mm	DIN 7980	100	000000000	0000
M5	5.4 mm					8.8 mm	1.5 mm to 1.7 mm	DIN 7980	100	000000000	0000
M6	6.5 mm					9.9 mm	1.5 mm to 1.7 mm	DIN 7980	100	000000000	0000


M8	8.5 mm					12.7 mm	1.9 mm to 2.1 mm	DIN 7980	50	000000000	0000
M10	10.7 mm					16.0 mm	2.3 mm to 2.7 mm	DIN 7980	50	000000000	00000
M12	12.7 mm					18.0 mm	2.3 mm to 2.7 mm	DIN 7980	25	000000000	00000
M14	14.7 mm					21.1 mm	2.8 mm to 3.2 mm	DIN 7980	10	000000000	0000
M16	17.0 mm					24.4 mm	3.3 mm to 3.7 mm	DIN 7980	10	000000000	0000
M18	19.0 mm					26.4 mm	3.3 mm to 3.7 mm	DIN 7980	10	000000000	0000
M20	21.2 mm					30.6 mm	4.3 mm to 4.7 mm	DIN 7980	1	000000000	0000
M22	23.5 mm					32.9 mm	4.3 mm to 4.7 mm	DIN 7980	1	000000000	0000
M24	25.5 mm					35.9 mm	4.8 mm to 5.2 mm	DIN 7980	1	000000000	0000
M30	31.7 mm					44.1 mm	5.8 mm to 6.2 mm	DIN 7980	1	000000000	00000


Zinc-Plated Steel



						No. 6	0.148"	0.216"	0.030"	ASME B18.21.1	50	000000000	0000


		No. 8	0.174"			0.267"	0.042"	ASME B18.21.1	50	000000000	0000
		No. 10	0.200"			0.294"	0.047"	ASME B18.21.1	50	000000000	0000
		1/4"	0.260"			0.363"	0.078"	ASME B18.21.1	50	000000000	0000
		5/16"	0.322"			0.457"	0.093"	ASME B18.21.1	50	000000000	0000
		3/8"	0.385"			0.550"	0.125"	ASME B18.21.1	50	000000000	0000
		7/16"	0.450"			0.644"	0.140"	ASME B18.21.1	25	000000000	00000
		1/2"	0.512"			0.733"	0.172"	ASME B18.21.1	25	000000000	0000
		5/8"	0.641"			0.917"	0.203"	ASME B18.21.1	25	000000000	0000
		3/4"	0.766"			1.105"	0.218"	ASME B18.21.1	10	000000000	0000
		7/8"	0.984"			1.291"	0.234"	ASME B18.21.1	5	000000000	0000


		1"	1.024"			1.478"	0.250"	ASME B18.21.1	1	000000000	00000
		M3	3.4 mm			5.6 mm	0.9 mm to 1.1 mm	DIN 7980	100	000000000	0000
		M4	4.4 mm			7.0 mm	1.1 mm to 1.3 mm	DIN 7980	100	000000000	0000
		M5	5.4 mm			8.8 mm	1.5 mm to 1.7 mm	DIN 7980	100	000000000	0000
		M6	6.5 mm	9.9 mm		1.5 mm to 1.7 mm	DIN 7980	100	000000000	0000
		M8	8.5 mm	12.7 mm	1.9 mm to 2.1 mm	DIN 7980	100	000000000	0000
		M10	10.7 mm	16.0 mm	2.3 mm to 2.7 mm	DIN 7980	100	000000000	00000
		M12	12.7 mm	18.0 mm	2.3 mm to 2.7 mm	DIN 7980	100	000000000	00000
		M14	14.7 mm	21.1 mm	2.8 mm to 3.2 mm	DIN 7980	50	000000000	00000
		M16	17.0 mm	24.4 mm	3.3 mm to 3.7 mm	DIN 7980	25	000000000	0000


		M18	19.0 mm	26.4 mm	3.3 mm to 3.7 mm	DIN 7980	25	000000000	00000
		M20	21.2 mm	30.6 mm	4.3 mm to 4.7 mm	DIN 7980	10	000000000	0000
		M24	25.5 mm	35.9 mm	4.8 mm to 5.2 mm	DIN 7980	10	000000000	0000
		M27	28.5 mm	38.9 mm	4.8 mm to 5.2 mm	DIN 7980	5	000000000	0000
		M30	31.7 mm	44.1 mm	5.8 mm to 6.2 mm	DIN 7980	5	000000000	00000
		M36	37.7 mm	52.2 mm	6.7 mm to 7.3 mm	DIN 7980	1	000000000	0000


		Zinc-Yellow-Chromate-Plated Steel



				M4	4.1 mm	7.0 mm	1.1 mm to 1.3 mm	DIN 7980	100	000000000	0000


				M5	5.1 mm	8.8 mm	1.5 mm to 1.7 mm	DIN 7980	25	000000000	0000
				M6	6.1 mm	9.9 mm	1.5 mm to 1.7 mm	DIN 7980	100	000000000	0000
				M8	8.1 mm	12.7 mm	1.9 mm to 2.1 mm	DIN 7980	100	000000000	0000
				M10	10.2 mm	16.0 mm	2.3 mm to 2.7 mm	DIN 7980	100	000000000	00000
				M12	12.2 mm	18.0 mm	2.3 mm to 2.7 mm	DIN 7980	100	000000000	00000
				M16	16.2 mm	24.4 mm	3.3 mm to 3.7 mm	DIN 7980	25	000000000	00000


				Black-Oxide Steel



						No. 4	0.117"	0.173"	0.022"	ASME B18.21.1	50	000000000	0000


						No. 6	0.145"	0.216"	0.030"	ASME B18.21.1	50	000000000	0000
						No. 8	0.174"	0.267"	0.042"	ASME B18.21.1	50	000000000	0000
						No. 10	0.200"	0.294"	0.047"	ASME B18.21.1	50	000000000	0000
						1/4"	0.260"	0.363"	0.078"	ASME B18.21.1	50	000000000	0000
5/16"						0.322"	0.457"	0.093"	ASME B18.21.1	50	000000000	0000
3/8"	0.385"					0.550"	0.125"	ASME B18.21.1	10	000000000	0000
7/16"	0.450"					0.644"	0.140"	ASME B18.21.1	25	000000000	0000
1/2"	0.512"					0.733"	0.172"	ASME B18.21.1	25	000000000	0000
5/8"	0.641"					0.917"	0.203"	ASME B18.21.1	10	000000000	00000
3/4"	0.766"					1.105"	0.218"	ASME B18.21.1	5	000000000	0000


7/8"	0.984"					1.291"	0.234"	ASME B18.21.1	5	000000000	0000
1"	1.024"					1.478"	0.250"	ASME B18.21.1	1	000000000	0000
1 1/8"	1.153"					1.663"	0.313"	ASME B18.21.1	1	000000000	0000
1 1/4"	1.280"					1.790"	0.313"	ASME B18.21.1	1	000000000	0000
M3	3.4 mm					5.6 mm	0.9 mm to 1.1 mm	DIN 7980	100	000000000	0000
M3.5	3.9 mm					6.1 mm	0.9 mm to 1.1 mm	DIN 7980	100	000000000	0000
M4	4.4 mm					7.0 mm	1.1 mm to 1.3 mm	DIN 7980	100	000000000	0000
M5	5.4 mm					8.8 mm	1.5 mm to 1.7 mm	DIN 7980	100	000000000	0000
M6	6.5 mm					9.9 mm	1.5 mm to 1.7 mm	DIN 7980	100	000000000	0000
M8	8.5 mm					12.7 mm	1.9 mm to 2.1 mm	DIN 7980	100	000000000	0000


M10	10.7 mm					16.0 mm	2.3 mm to 2.7 mm	DIN 7980	100	000000000	00000
M12	12.7 mm					18.0 mm	2.3 mm to 2.7 mm	DIN 7980	100	000000000	00000
M14	14.7 mm					21.1 mm	2.8 mm to 3.2 mm	DIN 7980	100	000000000	00000
M16	17.0 mm					24.4 mm	3.3 mm to 3.7 mm	DIN 7980	50	000000000	00000
M18	19.0 mm					26.4 mm	3.3 mm to 3.7 mm	DIN 7980	25	000000000	0000
M20	21.2 mm					30.6 mm	4.3 mm to 4.7 mm	DIN 7980	25	000000000	00000
M22	23.5 mm					32.9 mm	4.3 mm to 4.7 mm	DIN 7980	10	000000000	0000
M24	25.5 mm					35.9 mm	4.8 mm to 5.2 mm	DIN 7980	10	000000000	00000
M27	28.5 mm					38.9 mm	4.8 mm to 5.2 mm	DIN 7980	5	000000000	0000
M30	31.7 mm					44.1 mm	5.8 mm to 6.2 mm	DIN 7980	5	000000000	00000


M36	37.7 mm					52.2 mm	6.7 mm to 7.3 mm	DIN 7980	1	000000000	0000
M42	43.7 mm					60.2 mm	7.7 mm to 8.3 mm	DIN 7980	1	000000000	00000
M48	50.5 mm					67.0 mm	7.7 mm to 8.3 mm	DIN 7980	1	000000000	00000


Steel



		No. 4	0.120"			0.173"	0.022"	ASME B18.21.1	100	000000000	0000


		No. 5	0.133"			0.202"	0.030"	ASME B18.21.1	100	000000000	0000
		No. 6	0.148"			0.216"	0.030"	ASME B18.21.1	100	000000000	0000
		No. 10	0.200"			0.294"	0.047"	ASME B18.21.1	100	000000000	0000
		1/4"	0.260"			0.363"	0.078"	ASME B18.21.1	100	000000000	0000
		5/16"	0.322"			0.457"	0.093"	ASME B18.21.1	100	000000000	0000
		3/8"	0.385"			0.550"	0.125"	ASME B18.21.1	100	000000000	0000
		7/16"	0.450"			0.644"	0.140"	ASME B18.21.1	100	000000000	00000
		1/2"	0.512"			0.733"	0.172"	ASME B18.21.1	100	000000000	00000
		5/8"	0.641"			0.917"	0.203"	ASME B18.21.1	50	000000000	00000
		3/4"	0.766"			1.105"	0.218"	ASME B18.21.1	25	000000000	0000


		7/8"	0.894"	1.291"	0.234"	ASME B18.21.1	25	000000000	00000
		1"	1.024"	1.478"	0.250"	ASME B18.21.1	10	000000000	0000
		1 1/8"	1.153"	1.663"	0.313"	ASME B18.21.1	5	000000000	00000
		1 1/4"	1.280"	1.790"	0.313"	ASME B18.21.1	10	000000000	00000
		1 1/2"	1.534"	2.159"	0.375"	ASME B18.21.1	5	000000000	00000