DIN 7980 Lock Washers | McMaster-Carr

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70 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.

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.

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



		M3	3.4	5.6	0.9 to 1.1	DIN 7980	100	91111A118	00000


		M3.5	3.9	6.1	0.9 to 1.1	DIN 7980	100	91111A119	0000
		M4	4.4	7.0	1.1 to 1.3	DIN 7980	100	91111A121	0000
		M5	5.4	8.8	1.5 to 1.7	DIN 7980	100	91111A124	0000
		M6	6.5	9.9	1.5 to 1.7	DIN 7980	100	91111A129	0000
		M8	8.5	12.7	1.9 to 2.1	DIN 7980	100	91111A132	00000
		M10	10.7	16.0	2.3 to 2.7	DIN 7980	100	91111A135	00000
		M12	12.7	18.0	2.3 to 2.7	DIN 7980	50	91111A138	0000
		M14	14.7	21.1	2.8 to 3.2	DIN 7980	10	91111A141	0000
		M16	17.0	24.4	3.3 to 3.7	DIN 7980	10	91111A143	0000
		M18	19.0	26.4	3.3 to 3.7	DIN 7980	10	91111A145	0000


		M20	21.2	30.6	4.3 to 4.7	DIN 7980	10	91111A147	0000
		M22	23.5	32.9	4.3 to 4.7	DIN 7980	5	91111A149	00000
		M24	25.5	35.9	4.8 to 5.2	DIN 7980	5	91111A151	0000
		M30	31.7	44.1	5.8 to 6.2	DIN 7980	1	91111A155	00000


		Highly Corrosion-Resistant 316 Stainless Steel



				M3	3.4	5.6	0.9 to 1.1	DIN 7980	100	94241A510	0000


				M4	4.4	7.0	1.1 to 1.3	DIN 7980	100	94241A520	0000
				M5	5.4	8.8	1.5 to 1.7	DIN 7980	100	94241A530	0000
				M6	6.5	9.9	1.5 to 1.7	DIN 7980	100	94241A540	0000
				M8	8.5	12.7	1.9 to 2.1	DIN 7980	50	94241A550	0000
				M10	10.7	16.0	2.3 to 2.7	DIN 7980	50	94241A560	00000
				M12	12.7	18.0	2.3 to 2.7	DIN 7980	25	94241A570	0000
				M14	14.7	21.1	2.8 to 3.2	DIN 7980	10	94241A580	0000
				M16	17.0	24.4	3.3 to 3.7	DIN 7980	10	94241A590	0000
				M18	19.0	26.4	3.3 to 3.7	DIN 7980	10	94241A610	0000
				M20	21.2	30.6	4.3 to 4.7	DIN 7980	1	94241A620	0000


				M22	23.5	32.9	4.3 to 4.7	DIN 7980	1	94241A630	0000
				M24	25.5	35.9	4.8 to 5.2	DIN 7980	1	94241A640	0000
				M30	31.7	44.1	5.8 to 6.2	DIN 7980	1	94241A650	0000


				Zinc-Plated Steel



						M3	3.4	5.6	0.9 to 1.1	DIN 7980	100	93837A110	0000


						M4	4.4	7.0	1.1 to 1.3	DIN 7980	100	93837A120	0000
						M5	5.4	8.8	1.5 to 1.7	DIN 7980	100	93837A130	0000
						M6	6.5	9.9	1.5 to 1.7	DIN 7980	100	93837A140	0000
						M8	8.5	12.7	1.9 to 2.1	DIN 7980	100	93837A230	0000
						M10	10.7	16.0	2.3 to 2.7	DIN 7980	100	93837A150	00000
						M12	12.7	18.0	2.3 to 2.7	DIN 7980	100	93837A240	00000
						M14	14.7	21.1	2.8 to 3.2	DIN 7980	50	93837A250	0000
						M16	17.0	24.4	3.3 to 3.7	DIN 7980	25	93837A160	0000
						M18	19.0	26.4	3.3 to 3.7	DIN 7980	25	93837A170	00000
M20						21.2	30.6	4.3 to 4.7	DIN 7980	10	93837A180	0000


M24	25.5					35.9	4.8 to 5.2	DIN 7980	10	93837A190	0000
M27	28.5					38.9	4.8 to 5.2	DIN 7980	5	93837A260	0000
M30	31.7					44.1	5.8 to 6.2	DIN 7980	5	93837A210	00000
M36	37.7					52.2	6.7 to 7.3	DIN 7980	1	93837A220	0000


Zinc-Yellow-Chromate-Plated Steel



						M4	4.1	7.0	1.1 to 1.3	DIN 7980	100	93837A310	0000


						M5	5.1	8.8	1.5 to 1.7	DIN 7980	25	93837A320	00000
						M6	6.1	9.9	1.5 to 1.7	DIN 7980	100	93837A330	0000
						M8	8.1	12.7	1.9 to 2.1	DIN 7980	100	93837A340	0000
						M10	10.2	16.0	2.3 to 2.7	DIN 7980	100	93837A350	00000
						M12	12.2	18.0	2.3 to 2.7	DIN 7980	100	93837A360	00000
						M16	16.2	24.4	3.3 to 3.7	DIN 7980	25	93837A370	00000


						Black-Oxide Steel



			M3				3.4	5.6	0.9 to 1.1	DIN 7980	100	91190A510	0000


			M3.5				3.9	6.1	0.9 to 1.1	DIN 7980	100	91190A515	0000
			M4				4.4	7.0	1.1 to 1.3	DIN 7980	100	91190A520	0000
			M5				5.4	8.8	1.5 to 1.7	DIN 7980	100	91190A530	0000
			M6				6.5	9.9	1.5 to 1.7	DIN 7980	100	91190A540	0000
			M8				8.5	12.7	1.9 to 2.1	DIN 7980	100	91190A550	0000
			M10				10.7	16.0	2.3 to 2.7	DIN 7980	100	91190A560	00000
			M12				12.7	18.0	2.3 to 2.7	DIN 7980	100	91190A570	00000
			M14				14.7	21.1	2.8 to 3.2	DIN 7980	100	91190A580	00000
			M16				17.0	24.4	3.3 to 3.7	DIN 7980	50	91190A590	00000
			M18				19.0	26.4	3.3 to 3.7	DIN 7980	25	91190A600	00000


			M20				21.2	30.6	4.3 to 4.7	DIN 7980	25	91190A610	00000
			M22				23.5	32.9	4.3 to 4.7	DIN 7980	10	91190A620	0000
			M24				25.5	35.9	4.8 to 5.2	DIN 7980	10	91190A630	0000
			M27				28.5	38.9	4.8 to 5.2	DIN 7980	5	91190A650	0000
			M30				31.7	44.1	5.8 to 6.2	DIN 7980	5	91190A670	0000
			M36				37.7	52.2	6.7 to 7.3	DIN 7980	1	91190A690	0000
			M42				43.7	60.2	7.7 to 8.3	DIN 7980	1	91190A660	00000
			M48	50.5			67.0	7.7 to 8.3	DIN 7980	1	91190A640	00000