DIN 127B Lock Washers | McMaster-Carr

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U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Export Control Classification Number (ECCN)

EAR99

Spring Lock Washers Included

For M4 Screw Size (200 Pieces)

For M5 Screw Size (200 Pieces)

For M6 Screw Size (200 Pieces)

For M8 Screw Size (200 Pieces)

Fastener Head Type

Drive Style

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Number of Pieces

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Container Width

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Container Length

133 Products

Split Lock Washers

Stop nuts and screws from loosening due to mild vibration. As you tighten, the uneven ends bite into the nut or screw so it won't back out. 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.

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.

Blue-Dyed Steel—These metric-sized washers have a distinctive blue color, so you can easily tell them apart from inch washers. The coating provides only minimal corrosion resistance, so these washers are best for dry environments.

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

Corrosion-Resistant Galvanized Steel—These washers combine the strength of steel with the rust resistance of stainless steel. They're an alternative to 18-8 stainless steel in wet and outdoor environments, but they won't hold up to salt water and chemicals.

Highly Corrosion-Resistant Zinc-Flake-Coated Steel—With 40 times the corrosion resistance of zinc-plated steel, these withstand rust as well as 316 stainless steel. They have been tested to extreme standards, including 1,000 hours of salt spray. They are similar to Magni-coated washers.

Highly Corrosion-Resistant Silicon Bronze—The choice for marine environments, these washers won't rust or deteriorate when submerged in salt water. They resist corrosion as well as 316 stainless steel, but are not quite as strong.

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



		M2	2.4	4.4	0.4 to 0.6	DIN 127B	100	92148A050	00000


		M2.5	2.9	5.1	0.5 to 0.7	DIN 127B	100	92148A070	0000
		M2.6	3.0	5.2	0.5 to 0.7	DIN 127B	100	92148A110	0000
		M3	3.4	6.2	0.7 to 0.9	DIN 127B	100	92148A150	0000
		M3.5	3.9	6.7	0.7 to 0.9	DIN 127B	100	92148A155	0000
		M4	4.4	7.6	0.8 to 1.0	DIN 127B	100	92148A160	0000
		M5	5.4	9.2	1.1 to 1.3	DIN 127B	100	92148A170	0000
		M6	6.5	11.8	1.5 to 1.7	DIN 127B	100	92148A180	0000
		M7	7.5	12.8	1.5 to 1.7	DIN 127B	50	92148A311	0000
		M8	8.5	14.8	1.9 to 2.1	DIN 127B	100	92148A200	00000
		M10	10.7	18.1	2.0 to 2.4	DIN 127B	100	92148A210	00000


		M12	12.7	21.1	2.3 to 2.7	DIN 127B	50	92148A214	00000
		M14	14.7	24.1	2.8 to 3.2	DIN 127B	25	92148A221	00000
		M16	17.0	27.4	3.3 to 3.7	DIN 127B	25	92148A241	00000
		M18	19.0	29.4	3.3 to 3.7	DIN 127B	10	92148A251	0000
		M20	21.2	33.6	3.8 to 4.2	DIN 127B	10	92148A261	0000
		M22	22.5	35.9	3.8 to 4.2	DIN 127B	5	92148A111	0000
		M24	25.5	40.0	4.8 to 5.2	DIN 127B	10	92148A271	00000
		M27	27.5	43.0	4.8 to 5.2	DIN 127B	5	92148A112	00000
		M30	31.7	48.2	5.8 to 6.2	DIN 127B	1	92148A281	0000
		M36	37.7	58.2	5.8 to 6.2	DIN 127B	1	92148A291	0000


		Black-Oxide 18-8 Stainless Steel



				M2	2.4	4.4	0.4 to 0.6	DIN 127B	10	92148A331	0000


				M2.5	2.9	5.1	0.5 to 0.7	DIN 127B	10	92148A332	0000
				M3	3.4	6.2	0.7 to 0.9	DIN 127B	10	92148A333	0000
				M5	5.4	9.2	1.1 to 1.3	DIN 127B	10	92148A334	0000
				M6	6.5	11.8	1.5 to 1.7	DIN 127B	10	92148A335	0000
				M8	8.5	14.8	1.9 to 2.1	DIN 127B	10	92148A336	0000
				M10	10.7	18.1	2.0 to 2.4	DIN 127B	10	92148A337	0000
				M12	12.7	21.1	2.3 to 2.7	DIN 127B	10	92148A338	0000
				M16	17.0	27.4	3.3 to 3.7	DIN 127B	10	92148A339	0000
				M20	21.2	33.6	3.8 to 4.2	DIN 127B	10	92148A341	00000


				Highly Corrosion-Resistant 316 Stainless Steel



						M2	2.4	4.4	0.4 to 0.6	DIN 127B	100	92153A406	0000


						M2.5	2.9	5.1	0.5 to 0.7	DIN 127B	100	92153A411	0000
						M3	3.4	6.2	0.7 to 0.9	DIN 127B	100	92153A416	0000
						M3.5	3.9	6.7	0.7 to 0.9	DIN 127B	100	92153A451	0000
						M4	4.4	7.6	0.8 to 1.0	DIN 127B	100	92153A418	0000
						M5	5.4	9.2	1.1 to 1.3	DIN 127B	100	92153A422	0000
						M6	6.5	11.8	1.5 to 1.7	DIN 127B	100	92153A426	0000
						M8	8.5	14.8	1.9 to 2.1	DIN 127B	100	92153A429	0000
						M10	10.7	18.1	2.0 to 2.4	DIN 127B	50	92153A434	0000
						M12	12.7	21.1	2.3 to 2.7	DIN 127B	50	92153A436	00000
M14						14.7	24.1	2.8 to 3.2	DIN 127B	25	92153A439	0000


M16	17.0					27.4	3.3 to 3.7	DIN 127B	10	92153A442	0000
M18	19.0					29.4	3.3 to 3.7	DIN 127B	10	92153A445	0000
M20	21.2					33.6	3.8 to 4.2	DIN 127B	10	92153A447	0000
M24	25.5					40.0	4.8 to 5.2	DIN 127B	5	92153A449	0000
M30	31.7					48.2	5.8 to 6.2	DIN 127B	1	92153A453	0000


Zinc-Plated Steel



						M2	2.4	4.4	0.4 to 0.6	DIN 127B	100	91202A214	0000


						M2.5	2.9	5.1	0.5 to 0.7	DIN 127B	100	91202A218	0000
						M3	3.4	6.2	0.7 to 0.9	DIN 127B	100	91202A222	0000
						M3.5	3.6	6.7	0.7 to 0.9	DIN 127B	100	91202A224	0000
						M4	4.4	7.6	0.8 to 1.0	DIN 127B	100	91202A226	0000
						M5	5.4	9.2	1.1 to 1.3	DIN 127B	100	91202A230	0000
						M6	6.5	11.8	1.5 to 1.7	DIN 127B	100	91202A234	0000
						M7	7.5	12.8	1.5 to 1.7	DIN 127B	100	91202A111	0000
						M8	8.5	14.8	1.9 to 2.1	DIN 127B	100	91202A238	0000
						M10	10.7	18.1	2.0 to 2.4	DIN 127B	100	91202A242	0000
						M12	12.7	21.1	2.3 to 2.7	DIN 127B	100	91202A246	00000


						M14	14.7	24.1	2.8 to 3.2	DIN 127B	100	91202A250	00000
						M16	17.0	27.4	3.3 to 3.7	DIN 127B	50	91202A253	00000
						M18	19.0	29.4	3.3 to 3.7	DIN 127B	25	91202A112	0000
		M20				21.2	33.6	3.8 to 4.2	DIN 127B	25	91202A257	00000
		M22	22.5			35.9	3.8 to 4.2	DIN 127B	10	91202A113	0000
		M24	25.5			40.0	4.8 to 5.2	DIN 127B	25	91202A261	00000
		M27	28.5			43.0	4.8 to 5.2	DIN 127B	10	91202A114	00000
		M30	31.7			48.2	5.8 to 6.2	DIN 127B	10	91202A263	00000
		M33	33.5			55.2	5.8 to 6.2	DIN 127B	5	91202A115	00000
		M36	37.7			58.2	5.8 to 6.2	DIN 127B	5	91202A265	00000


		M42	43.7			68.2	6.8 to 7.2	DIN 127B	1	91202A116	0000
		M48	50.5			75.0	6.8 to 7.2	DIN 127B	1	91202A117	00000


		Zinc-Yellow-Chromate-Plated Steel



						M3	3.4	6.2	0.7 to 0.9	DIN 127B	100	96982A151	0000


				M4	4.4	7.6	0.8 to 1.0	DIN 127B	100	96982A152	0000
				M5	5.4	9.2	1.1 to 1.3	DIN 127B	100	96982A153	0000
				M6	6.5	11.8	1.5 to 1.7	DIN 127B	100	96982A154	0000
				M8	8.5	14.8	1.9 to 2.1	DIN 127B	100	96982A155	0000
				M10	10.7	18.1	2.0 to 2.4	DIN 127B	100	96982A156	00000
				M12	12.7	21.1	2.3 to 2.7	DIN 127B	50	96982A157	0000
				M14	14.7	24.1	2.8 to 3.2	DIN 127B	50	96982A158	00000
				M16	17.0	27.4	3.3 to 3.7	DIN 127B	25	96982A159	0000
				M18	19.0	29.4	3.3 to 3.7	DIN 127B	25	96982A161	00000
				M20	21.2	33.6	3.8 to 4.2	DIN 127B	10	96982A162	0000


				M24	25.5	40.0	4.8 to 5.2	DIN 127B	10	96982A163	0000
				M30	31.7	48.2	5.8 to 6.2	DIN 127B	5	96982A164	00000


				Black-Oxide Steel



						M6	6.5	11.8	1.5 to 1.7	DIN 127B	100	97093A214	00000


M8						8.5	14.8	1.9 to 2.1	DIN 127B	100	97093A215	00000
M10	10.7					18.1	2.0 to 2.4	DIN 127B	50	97093A216	0000
M16	17.0					27.4	3.3 to 3.7	DIN 127B	25	97093A218	0000


Blue-Dyed Steel



						M3	3.4	6.2	0.7 to 0.9	DIN 127B	100	93279A123	0000


						M4	4.5	7.6	0.8 to 1.0	DIN 127B	100	93279A124	0000
						M5	5.4	9.2	1.1 to 1.3	DIN 127B	100	93279A125	0000
						M6	6.5	11.8	1.5 to 1.7	DIN 127B	50	93279A110	0000
						M8	8.5	14.8	1.9 to 2.1	DIN 127B	50	93279A120	0000
						M10	10.7	18.1	2.0 to 2.4	DIN 127B	25	93279A130	0000
						M12	12.7	21.1	2.3 to 2.7	DIN 127B	25	93279A140	0000
						M16	17.0	27.4	3.3 to 3.7	DIN 127B	25	93279A150	00000
						M20	21.2	33.6	3.8 to 4.2	DIN 127B	10	93279A160	0000


						Steel



								M2	2.4	4.4	0.4 to 0.6	DIN 127B	100	91169A050	0000


								M2.5	2.9	5.1	0.5 to 0.7	DIN 127B	100	91169A070	0000
								M3	3.4	6.2	0.7 to 0.9	DIN 127B	100	91169A150	0000
								M3.5	3.9	6.7	0.7 to 0.9	DIN 127B	100	91169A155	0000
								M4	4.4	7.6	0.8 to 1.0	DIN 127B	100	91169A160	0000
								M5	5.4	9.2	1.1 to 1.3	DIN 127B	100	91169A170	0000
								M6	6.5	11.8	1.5 to 1.7	DIN 127B	100	91169A180	0000
								M8	8.5	14.8	1.9 to 2.1	DIN 127B	100	91169A200	0000
		M10						10.7	18.1	2.0 to 2.4	DIN 127B	100	91169A210	0000
		M12	12.7					21.1	2.3 to 2.7	DIN 127B	100	91169A214	00000
		M14	14.7					24.1	2.8 to 3.2	DIN 127B	100	91169A220	00000


		M16	17.0					27.4	3.3 to 3.7	DIN 127B	50	91169A240	00000
		M18	19.0					29.4	3.3 to 3.7	DIN 127B	50	91169A242	00000
		M20	21.2					33.6	3.8 to 4.2	DIN 127B	25	91169A245	00000
		M24	25.5					40.0	4.8 to 5.2	DIN 127B	25	91169A248	00000
		M30	31.7					48.2	5.8 to 6.2	DIN 127B	5	91169A244	00000
		M36	37.7					58.2	5.8 to 6.2	DIN 127B	1	91169A249	0000


		Corrosion-Resistant Galvanized Steel



								M6	6.5	11.8	1.5 to 1.7	DIN 127B	50	91169A310	00000


								M8	8.5	14.8	1.9 to 2.1	DIN 127B	50	91169A320	00000
								M10	10.7	18.1	2.0 to 2.4	DIN 127B	50	91169A330	00000
								M12	12.7	21.1	2.3 to 2.7	DIN 127B	25	91169A340	00000
								M16	17.0	27.4	3.3 to 3.7	DIN 127B	10	91169A350	0000
				M20				21.2	33.6	3.8 to 4.2	DIN 127B	1	91169A360	0000


				Highly Corrosion-Resistant Zinc-Flake-Coated Steel



								M6	6.5	11.8	1.5 to 1.7	DIN 127B	25	90491A101	0000


M8								8.5	14.8	1.9 to 2.1	DIN 127B	25	90491A102	00000
M10	10.7							18.1	2.0 to 2.4	DIN 127B	25	90491A103	00000


Highly Corrosion-Resistant Silicon Bronze



								M3	3.4	6.2	0.7 to 0.9	DIN 127B	100	97093A201	00000


								M4	4.4	7.6	0.8 to 1.0	DIN 127B	100	97093A202	00000
								M5	5.4	9.2	1.1 to 1.3	DIN 127B	100	97093A203	00000
								M6	6.5	11.8	1.5 to 1.7	DIN 127B	50	97093A204	00000
								M8	8.5	14.8	1.9 to 2.1	DIN 127B	25	97093A205	00000
								M10	10.7	18.1	2.0 to 2.4	DIN 127B	10	97093A206	0000

Fastener Assortments

Zinc-Plated Steel—Zinc-plated steel fasteners resist corrosion in wet environments.

Black-Oxide Steel—Black-oxide steel fasteners resist corrosion in dry environments.

18-8 Stainless Steel—18-8 stainless steel fasteners are chemical resistant and may be mildly magnetic.

	Includes	Drive Style	Specs. Met	Container Type		Each
Zinc-Plated Steel, Black-Oxide Steel



	7,060	1,225 Flat Washers (For M4 to M12 Screw Sizes) 1,475 Hex Nuts (M3 to M12) 1,600 Lock Washers (For M3 to M12 Screw Sizes) 60 Set Screws (M4 to M6) 570 Socket Head Screws (M4 to M12) 580 Hex Head Screws (M4 to M12) 750 Rounded Head Screws (M3 to M6) 800 Spring Lock Washers (For M4 to M8 Screw Sizes)	External Hex, Hex, Phillips	DIN 125, DIN 127B, DIN 7985, DIN 912, DIN 916, DIN 933, DIN 934	Metal Drawer Cabinet	91284A214	000000000


	18-8 Stainless Steel



			2,200	300 Flat Head Screws (M3 to M4) 300 Rounded Head Screws (M3 to M4) 500 Flat Washers (For M3 to M10 Screw Sizes) 500 Lock Washers (For M3 to M10 Screw Sizes) 600 Hex Nuts (M3 to M10)	Phillips	DIN 125, DIN 127B, DIN 7985, DIN 934, DIN 965	Metal Box	91470A150	000000


			7,060	1,225 Flat Washers (For M4 to M12 Screw Sizes) 1,475 Hex Nuts (M3 to M12) 1,600 Lock Washers (For M3 to M12 Screw Sizes) 60 Set Screws (M4 to M6) 570 Socket Head Screws (M4 to M12) 580 Hex Head Screws (M4 to M12) 750 Rounded Head Screws (M3 to M6) 800 Spring Lock Washers (For M4 to M8 Screw Sizes)	External Hex, Hex, Phillips	DIN 125, DIN 127B, DIN 7985, DIN 912, DIN 916, DIN 933, DIN 934	Metal Drawer Cabinet	91284A376	00000000

Split Lock Washer Assortments

Image of Product. Front orientation. Lock Washers. Split-Lock Washer, Sold as Assortments.

Keep a collection of common lock washers on hand to stop nuts and screws from loosening due to mild vibration. These washers have split ends that bite into the fastener to keep it 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.

Labels in the lid include our part numbers, so it's easy to replenish the assortments.

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

	Sizes Included	Specs. Met	Container Type		Each
18-8 Stainless Steel



	755	For M3 to M20 Screw Sizes	DIN 127B	Plastic Box	91170A409	0000000


	Steel



			755	For M3 to M20 Screw Sizes	DIN 127B	Plastic Box	91170A109	00000