DIN 128A Washers | McMaster-Carr

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50 Products

Curved Spring Lock Washers

The curvy, spring-like shape adds a small amount of tension to prevent nuts and screws from backing out due to mild vibration. These washers also flex slightly to compensate for uneven surfaces. While more secure than a standard flat washer, these have the least amount of gripping power of all our lock washers. They are best suited for electrical panels, light fixtures, and other light duty assemblies. These washers hold their shape when untightened, so you can reuse them a handful of times without losing strength.

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.

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.

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

DIN 128A—These washers have split ends that bite into your material surface for a tighter hold than other curved washers.

	ID, mm	OD, mm	Thk., mm	Overall Ht., mm	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	M2.5	2.6	5.1	0.5	0.9	DIN 128A	100	97093A138	00000


	M3	3.1	6.2	0.6	1.1	DIN 128A	100	97093A139	0000
	M4	4.1	7.6	0.7	1.2	DIN 128A	100	97093A141	0000
	M5	5.1	9.2	0.9	1.5	DIN 128A	100	97093A142	00000
	M6	6.1	11.8	1.2	2.0	DIN 128A	100	97093A143	00000
	M8	8.1	14.8	1.5	2.5	DIN 128A	50	97093A144	0000
	M10	10.2	18.1	1.7	2.9	DIN 128A	50	97093A145	00000
	M12	12.2	21.1	2.0	3.4	DIN 128A	50	97093A146	00000
	M14	14.2	24.1	2.3	3.9	DIN 128A	25	97093A147	00000
	M16	16.2	27.4	2.7	4.5	DIN 128A	20	97093A148	00000
	M18	18.2	29.4	2.7	4.5	DIN 128A	10	97093A149	00000


	M20	20.2	33.6	3.0	5.1	DIN 128A	10	97093A151	00000
	M22	22.5	35.9	3.0	5.1	DIN 128A	5	97093A152	0000
	M24	24.5	40.0	3.8	6.5	DIN 128A	5	97093A153	00000


	Zinc-Plated Steel



			M2.5	2.6	5.1	0.5	0.9	DIN 128A	100	97093A122	0000


			M3	3.1	6.2	0.6	1.1	DIN 128A	100	97093A123	0000
			M4	4.1	7.6	0.7	1.2	DIN 128A	100	97093A124	0000
			M5	5.1	9.2	0.9	1.5	DIN 128A	100	97093A125	0000
			M6	6.1	11.8	1.2	2.0	DIN 128A	100	97093A126	0000
			M8	8.1	14.8	1.5	2.5	DIN 128A	100	97093A127	00000
			M10	10.2	18.1	1.7	2.9	DIN 128A	100	97093A128	00000
			M12	12.2	21.1	2.0	3.4	DIN 128A	50	97093A129	00000
			M14	14.2	24.1	2.3	3.9	DIN 128A	25	97093A131	00000
			M16	16.2	27.4	2.7	4.5	DIN 128A	25	97093A132	00000
			M18	18.2	29.4	2.7	4.5	DIN 128A	10	97093A133	0000


			M20	20.2	33.6	3.0	5.1	DIN 128A	10	97093A134	00000
			M22	22.5	35.9	3.0	5.1	DIN 128A	10	97093A135	00000
			M24	24.5	40.0	3.8	6.5	DIN 128A	10	97093A136	00000
			M30	30.5	48.2	5.8	9.5	DIN 128A	1	97093A137	0000


			Zinc-Yellow-Chromate-Plated Steel



					M3	3.1	6.2	0.6	1.1	DIN 128A	100	96982A136	0000


					M3.5	3.6	6.7	0.6	1.1	DIN 128A	100	96982A137	0000
					M4	4.1	7.6	0.7	1.2	DIN 128A	100	96982A138	0000
					M5	5.1	9.2	0.9	1.5	DIN 128A	100	96982A139	0000
					M6	6.1	11.8	1.2	2	DIN 128A	100	96982A141	0000
					M8	8.1	14.8	1.5	2.5	DIN 128A	100	96982A142	0000
					M10	10.2	18.1	1.7	2.9	DIN 128A	100	96982A143	00000
					M12	12.2	21.1	2.0	3.4	DIN 128A	50	96982A144	0000
					M14	14.2	24.1	2.3	3.9	DIN 128A	25	96982A145	00000
					M16	16.2	27.4	2.7	4.5	DIN 128A	10	96982A146	00000
M20					20.2	33.6	3.0	5.1	DIN 128A	10	96982A147	00000


Steel



					M3	3.1	6.2	0.6	1.1	DIN 128A	100	97093A111	0000


					M4	4.1	7.6	0.7	1.2	DIN 128A	100	97093A112	0000
					M5	5.1	9.2	0.9	1.5	DIN 128A	100	97093A113	0000
					M6	6.1	11.8	1.2	2.0	DIN 128A	50	97093A114	0000
					M8	8.1	14.8	1.5	2.5	DIN 128A	50	97093A115	0000
					M10	10.2	18.1	1.7	2.9	DIN 128A	25	97093A116	00000
					M12	12.2	21.1	2.0	3.4	DIN 128A	10	97093A117	0000
					M16	16.2	27.4	2.7	4.5	DIN 128A	10	97093A118	0000
					M20	20.2	33.6	3.0	5.1	DIN 128A	5	97093A119	0000
					M24	24.5	40.0	3.8	6.5	DIN 128A	5	97093A121	00000