Metric Tab Lock Washers | McMaster-Carr

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420 Products

Washer Type

Split

Stop nuts and screws from loosening due to light vibration

284 products

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Grip better than split lock washers in applications with constant movement

130 products

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Countersunk

Grip flat- and oval-head screws for a secure hold without overtightening

7 products

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Keep bolted assemblies secure on slightly uneven surfaces

19 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.

Super-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.

Super-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.

Super-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	000000000	00000
		M2.5	2.9	5.1	0.5 to 0.7	DIN 127B	100	000000000	0000
		M2.6	3.0	5.2	0.5 to 0.7	DIN 127B	100	000000000	0000
		M3	3.4	6.2	0.7 to 0.9	DIN 127B	100	000000000	0000
		M3.5	3.9	6.7	0.7 to 0.9	DIN 127B	100	000000000	0000
		M4	4.4	7.6	0.8 to 1.0	DIN 127B	100	000000000	0000
		M5	5.4	9.2	1.1 to 1.3	DIN 127B	100	000000000	0000
		M6	6.5	11.8	1.5 to 1.7	DIN 127B	100	000000000	0000
		M7	7.5	12.8	1.5 to 1.7	DIN 127B	50	000000000	0000
		M8	8.5	14.8	1.9 to 2.1	DIN 127B	100	000000000	0000
		M10	10.7	18.1	2.0 to 2.4	DIN 127B	100	000000000	00000
		M12	12.7	21.1	2.3 to 2.7	DIN 127B	50	000000000	00000
		M14	14.7	24.1	2.8 to 3.2	DIN 127B	25	000000000	00000
		M16	17.0	27.4	3.3 to 3.7	DIN 127B	25	000000000	00000
		M18	19.0	29.4	3.3 to 3.7	DIN 127B	10	000000000	0000
		M20	21.2	33.6	3.8 to 4.2	DIN 127B	10	000000000	0000
		M22	22.5	35.9	3.8 to 4.2	DIN 127B	5	000000000	0000
		M24	25.5	40.0	4.8 to 5.2	DIN 127B	10	000000000	00000
		M27	27.5	43.0	4.8 to 5.2	DIN 127B	5	000000000	00000
		M30	31.7	48.2	5.8 to 6.2	DIN 127B	1	000000000	0000
		M36	37.7	58.2	5.8 to 6.2	DIN 127B	1	000000000	0000

		Black-Oxide 18-8 Stainless Steel


				M2	2.4	4.4	0.4 to 0.6	DIN 127B	10	000000000	0000
				M2.5	2.9	5.1	0.5 to 0.7	DIN 127B	10	000000000	0000
				M3	3.4	6.2	0.7 to 0.9	DIN 127B	10	000000000	0000
				M5	5.4	9.2	1.1 to 1.3	DIN 127B	10	000000000	0000
				M6	6.5	11.8	1.5 to 1.7	DIN 127B	10	000000000	0000
				M8	8.5	14.8	1.9 to 2.1	DIN 127B	10	000000000	0000
				M10	10.7	18.1	2.0 to 2.4	DIN 127B	10	000000000	0000
				M12	12.7	21.1	2.3 to 2.7	DIN 127B	10	000000000	0000
				M16	17.0	27.4	3.3 to 3.7	DIN 127B	10	000000000	0000
				M20	21.2	33.6	3.8 to 4.2	DIN 127B	10	000000000	00000

				Super-Corrosion-Resistant 316 Stainless Steel


						M2	2.4	4.4	0.4 to 0.6	DIN 127B	100	000000000	0000
						M2.5	2.9	5.1	0.5 to 0.7	DIN 127B	100	000000000	0000
						M3	3.4	6.2	0.7 to 0.9	DIN 127B	100	000000000	0000
						M3.5	3.9	6.7	0.7 to 0.9	DIN 127B	100	000000000	0000
						M4	4.4	7.6	0.8 to 1.0	DIN 127B	100	000000000	0000
						M5	5.4	9.2	1.1 to 1.3	DIN 127B	100	000000000	0000
						M6	6.5	11.8	1.5 to 1.7	DIN 127B	100	000000000	0000
						M8	8.5	14.8	1.9 to 2.1	DIN 127B	100	000000000	0000
						M10	10.7	18.1	2.0 to 2.4	DIN 127B	50	000000000	0000
						M12	12.7	21.1	2.3 to 2.7	DIN 127B	50	000000000	00000
						M14	14.7	24.1	2.8 to 3.2	DIN 127B	25	000000000	0000
						M16	17.0	27.4	3.3 to 3.7	DIN 127B	10	000000000	0000
						M18	19.0	29.4	3.3 to 3.7	DIN 127B	10	000000000	0000
						M20	21.2	33.6	3.8 to 4.2	DIN 127B	10	000000000	0000
						M24	25.5	40.0	4.8 to 5.2	DIN 127B	5	000000000	0000
						M30	31.7	48.2	5.8 to 6.2	DIN 127B	1	000000000	0000

						Zinc-Plated Steel


								M2	2.4	4.4	0.4 to 0.6	DIN 127B	100	000000000	0000
								M2.5	2.9	5.1	0.5 to 0.7	DIN 127B	100	000000000	0000
								M3	3.4	6.2	0.7 to 0.9	DIN 127B	100	000000000	0000
M3.5								3.6	6.7	0.7 to 0.9	DIN 127B	100	000000000	0000
M4	4.4							7.6	0.8 to 1.0	DIN 127B	100	000000000	0000
M5	5.4							9.2	1.1 to 1.3	DIN 127B	100	000000000	0000
M6	6.5							11.8	1.5 to 1.7	DIN 127B	100	000000000	0000
M7	7.5							12.8	1.5 to 1.7	DIN 127B	100	000000000	0000
M8	8.5							14.8	1.9 to 2.1	DIN 127B	100	000000000	0000
M10	10.7							18.1	2.0 to 2.4	DIN 127B	100	000000000	0000
M12	12.7							21.1	2.3 to 2.7	DIN 127B	100	000000000	00000
M14	14.7							24.1	2.8 to 3.2	DIN 127B	100	000000000	00000
M16	17.0							27.4	3.3 to 3.7	DIN 127B	50	000000000	00000
M18	19.0							29.4	3.3 to 3.7	DIN 127B	25	000000000	00000
M20	21.2							33.6	3.8 to 4.2	DIN 127B	25	000000000	00000
M22	22.5							35.9	3.8 to 4.2	DIN 127B	10	000000000	00000
M24	25.5							40.0	4.8 to 5.2	DIN 127B	25	000000000	00000
M27	28.5							43.0	4.8 to 5.2	DIN 127B	10	000000000	00000
M30	31.7							48.2	5.8 to 6.2	DIN 127B	10	000000000	00000
M33	33.5							55.2	5.8 to 6.2	DIN 127B	5	000000000	00000
M36	37.7							58.2	5.8 to 6.2	DIN 127B	5	000000000	00000
M42	43.7							68.2	6.8 to 7.2	DIN 127B	1	000000000	00000
M48	50.5							75.0	6.8 to 7.2	DIN 127B	1	000000000	00000

Zinc-Yellow-Chromate-Plated Steel


								M3	3.4	6.2	0.7 to 0.9	DIN 127B	100	000000000	0000
								M4	4.4	7.6	0.8 to 1.0	DIN 127B	100	000000000	0000
		M5						5.4	9.2	1.1 to 1.3	DIN 127B	100	000000000	0000
		M6	6.5					11.8	1.5 to 1.7	DIN 127B	100	000000000	0000
		M8	8.5					14.8	1.9 to 2.1	DIN 127B	100	000000000	0000
		M10	10.7					18.1	2.0 to 2.4	DIN 127B	100	000000000	00000
		M12	12.7					21.1	2.3 to 2.7	DIN 127B	50	000000000	0000
		M14	14.7					24.1	2.8 to 3.2	DIN 127B	50	000000000	00000
		M16	17.0					27.4	3.3 to 3.7	DIN 127B	25	000000000	0000
		M18	19.0					29.4	3.3 to 3.7	DIN 127B	25	000000000	00000
		M20	21.2					33.6	3.8 to 4.2	DIN 127B	10	000000000	0000
		M24	25.5					40.0	4.8 to 5.2	DIN 127B	10	000000000	0000
		M30	31.7					48.2	5.8 to 6.2	DIN 127B	5	000000000	00000

		Black-Oxide Steel


				M6				6.5	11.8	1.5 to 1.7	DIN 127B	100	000000000	00000
				M8	8.5			14.8	1.9 to 2.1	DIN 127B	100	000000000	00000
				M10	10.7			18.1	2.0 to 2.4	DIN 127B	50	000000000	0000
				M16	17.0			27.4	3.3 to 3.7	DIN 127B	25	000000000	0000

				Blue-Dyed Steel


								M3	3.4	6.2	0.7 to 0.9	DIN 127B	100	000000000	0000
								M4	4.5	7.6	0.8 to 1.0	DIN 127B	100	000000000	0000
								M5	5.4	9.2	1.1 to 1.3	DIN 127B	100	000000000	0000
								M6	6.2	12.1	2.0	ASME B18.21.2M	100	000000000	00000
								M6	6.5	11.8	1.5 to 1.7	DIN 127B	50	000000000	0000
								M8	8.2	15.2	2.5	ASME B18.21.2M	100	000000000	0000
								M8	8.5	14.8	1.9 to 2.1	DIN 127B	50	000000000	0000
								M10	10.2	18.0	2.9	ASME B18.21.2M	50	000000000	0000
								M10	10.7	18.1	2.0 to 2.4	DIN 127B	25	000000000	0000
								M12	12.3	21.7	3.8	ASME B18.21.2M	100	000000000	00000
								M12	12.7	21.1	2.3 to 2.7	DIN 127B	25	000000000	0000
								M16	16.4	27.9	4.8	ASME B18.21.2M	25	000000000	00000
								M16	17.0	27.4	3.3 to 3.7	DIN 127B	25	000000000	00000
						M20		20.5	33.8	5.7	ASME B18.21.2M	10	000000000	0000
						M20	21.2	33.6	3.8 to 4.2	DIN 127B	10	000000000	0000
						M24	24.5	40.7	7.2	ASME B18.21.2M	10	000000000	00000

						Steel


								M2	2.4	4.4	0.4 to 0.6	DIN 127B	100	000000000	0000
								M2.5	2.9	5.1	0.5 to 0.7	DIN 127B	100	000000000	0000
								M3	3.4	6.2	0.7 to 0.9	DIN 127B	100	000000000	0000
								M3.5	3.9	6.7	0.7 to 0.9	DIN 127B	100	000000000	0000
								M4	4.4	7.6	0.8 to 1.0	DIN 127B	100	000000000	0000
								M5	5.4	9.2	1.1 to 1.3	DIN 127B	100	000000000	0000
								M6	6.5	11.8	1.5 to 1.7	DIN 127B	100	000000000	0000
								M8	8.5	14.8	1.9 to 2.1	DIN 127B	100	000000000	0000
								M10	10.7	18.1	2.0 to 2.4	DIN 127B	100	000000000	0000
								M12	12.7	21.1	2.3 to 2.7	DIN 127B	100	000000000	0000
								M14	14.7	24.1	2.8 to 3.2	DIN 127B	100	000000000	00000
								M16	17.0	27.4	3.3 to 3.7	DIN 127B	50	000000000	00000
								M18	19.0	29.4	3.3 to 3.7	DIN 127B	50	000000000	00000
								M20	21.2	33.6	3.8 to 4.2	DIN 127B	25	000000000	00000
								M24	25.5	40.0	4.8 to 5.2	DIN 127B	25	000000000	00000
								M30	31.7	48.2	5.8 to 6.2	DIN 127B	5	000000000	00000
								M36	37.7	58.2	5.8 to 6.2	DIN 127B	1	000000000	0000

Corrosion-Resistant Galvanized Steel


								M6	6.5	11.8	1.5 to 1.7	DIN 127B	50	000000000	0000
								M8	8.5	14.8	1.9 to 2.1	DIN 127B	50	000000000	00000
								M10	10.7	18.1	2.0 to 2.4	DIN 127B	50	000000000	00000
								M12	12.7	21.1	2.3 to 2.7	DIN 127B	25	000000000	0000
								M16	17.0	27.4	3.3 to 3.7	DIN 127B	10	000000000	0000
								M20	21.2	33.6	3.8 to 4.2	DIN 127B	1	000000000	0000

								Super-Corrosion-Resistant Zinc-Flake-Coated Steel


										M6	6.5	11.8	1.5 to 1.7	DIN 127B	25	000000000	0000
										M8	8.5	14.8	1.9 to 2.1	DIN 127B	25	000000000	00000
										M10	10.7	18.1	2.0 to 2.4	DIN 127B	25	000000000	00000

		Super-Corrosion-Resistant Silicon Bronze


										M3	3.4	6.2	0.7 to 0.9	DIN 127B	100	000000000	00000
										M4	4.4	7.6	0.8 to 1.0	DIN 127B	100	000000000	00000
										M5	5.4	9.2	1.1 to 1.3	DIN 127B	100	000000000	00000
										M6	6.5	11.8	1.5 to 1.7	DIN 127B	50	000000000	00000
										M8	8.5	14.8	1.9 to 2.1	DIN 127B	25	000000000	00000
										M10	10.7	18.1	2.0 to 2.4	DIN 127B	10	000000000	0000

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.

Super-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.

	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	000000000	00000
	M3.5	3.9	6.1	0.9 to 1.1	DIN 7980	100	000000000	0000
	M4	4.4	7.0	1.1 to 1.3	DIN 7980	100	000000000	0000
	M5	5.4	8.8	1.5 to 1.7	DIN 7980	100	000000000	0000
	M6	6.5	9.9	1.5 to 1.7	DIN 7980	100	000000000	0000
	M8	8.5	12.7	1.9 to 2.1	DIN 7980	100	000000000	0000
	M10	10.7	16.0	2.3 to 2.7	DIN 7980	100	000000000	00000
	M12	12.7	18.0	2.3 to 2.7	DIN 7980	50	000000000	0000
	M14	14.7	21.1	2.8 to 3.2	DIN 7980	10	000000000	0000
	M16	17.0	24.4	3.3 to 3.7	DIN 7980	10	000000000	0000
	M18	19.0	26.4	3.3 to 3.7	DIN 7980	10	000000000	0000
	M20	21.2	30.6	4.3 to 4.7	DIN 7980	10	000000000	00000
	M22	23.5	32.9	4.3 to 4.7	DIN 7980	5	000000000	00000
	M24	25.5	35.9	4.8 to 5.2	DIN 7980	5	000000000	0000
	M30	31.7	44.1	5.8 to 6.2	DIN 7980	1	000000000	00000

	Super-Corrosion-Resistant 316 Stainless Steel


			M3	3.4	5.6	0.9 to 1.1	DIN 7980	100	000000000	0000
			M4	4.4	7.0	1.1 to 1.3	DIN 7980	100	000000000	0000
			M5	5.4	8.8	1.5 to 1.7	DIN 7980	100	000000000	0000
			M6	6.5	9.9	1.5 to 1.7	DIN 7980	100	000000000	0000
			M8	8.5	12.7	1.9 to 2.1	DIN 7980	50	000000000	0000
			M10	10.7	16.0	2.3 to 2.7	DIN 7980	50	000000000	00000
			M12	12.7	18.0	2.3 to 2.7	DIN 7980	25	000000000	00000
			M14	14.7	21.1	2.8 to 3.2	DIN 7980	10	000000000	0000
			M16	17.0	24.4	3.3 to 3.7	DIN 7980	10	000000000	0000
			M18	19.0	26.4	3.3 to 3.7	DIN 7980	10	000000000	0000
			M20	21.2	30.6	4.3 to 4.7	DIN 7980	1	000000000	0000
			M22	23.5	32.9	4.3 to 4.7	DIN 7980	1	000000000	0000
			M24	25.5	35.9	4.8 to 5.2	DIN 7980	1	000000000	0000
			M30	31.7	44.1	5.8 to 6.2	DIN 7980	1	000000000	00000

			Zinc-Plated Steel


					M3	3.4	5.6	0.9 to 1.1	DIN 7980	100	000000000	0000
					M4	4.4	7.0	1.1 to 1.3	DIN 7980	100	000000000	0000
					M5	5.4	8.8	1.5 to 1.7	DIN 7980	100	000000000	0000
					M6	6.5	9.9	1.5 to 1.7	DIN 7980	100	000000000	0000
					M8	8.5	12.7	1.9 to 2.1	DIN 7980	100	000000000	0000
					M10	10.7	16.0	2.3 to 2.7	DIN 7980	100	000000000	00000
					M12	12.7	18.0	2.3 to 2.7	DIN 7980	100	000000000	00000
					M14	14.7	21.1	2.8 to 3.2	DIN 7980	50	000000000	00000
					M16	17.0	24.4	3.3 to 3.7	DIN 7980	25	000000000	0000
					M18	19.0	26.4	3.3 to 3.7	DIN 7980	25	000000000	00000
					M20	21.2	30.6	4.3 to 4.7	DIN 7980	10	000000000	0000
					M24	25.5	35.9	4.8 to 5.2	DIN 7980	10	000000000	0000
					M27	28.5	38.9	4.8 to 5.2	DIN 7980	5	000000000	0000
					M30	31.7	44.1	5.8 to 6.2	DIN 7980	5	000000000	00000
					M36	37.7	52.2	6.7 to 7.3	DIN 7980	1	000000000	0000

					Zinc-Yellow-Chromate-Plated Steel


							M4	4.1	7.0	1.1 to 1.3	DIN 7980	100	000000000	0000
							M5	5.1	8.8	1.5 to 1.7	DIN 7980	25	000000000	0000
							M6	6.1	9.9	1.5 to 1.7	DIN 7980	100	000000000	0000
							M8	8.1	12.7	1.9 to 2.1	DIN 7980	100	000000000	0000
							M10	10.2	16.0	2.3 to 2.7	DIN 7980	100	000000000	00000
							M12	12.2	18.0	2.3 to 2.7	DIN 7980	100	000000000	00000
M16							16.2	24.4	3.3 to 3.7	DIN 7980	25	000000000	00000

Black-Oxide Steel


							M3	3.4	5.6	0.9 to 1.1	DIN 7980	100	000000000	0000
							M3.5	3.9	6.1	0.9 to 1.1	DIN 7980	100	000000000	0000
							M4	4.4	7.0	1.1 to 1.3	DIN 7980	100	000000000	0000
							M5	5.4	8.8	1.5 to 1.7	DIN 7980	100	000000000	0000
							M6	6.5	9.9	1.5 to 1.7	DIN 7980	100	000000000	0000
							M8	8.5	12.7	1.9 to 2.1	DIN 7980	100	000000000	0000
							M10	10.7	16.0	2.3 to 2.7	DIN 7980	100	000000000	00000
							M12	12.7	18.0	2.3 to 2.7	DIN 7980	100	000000000	00000
							M14	14.7	21.1	2.8 to 3.2	DIN 7980	100	000000000	00000
							M16	17.0	24.4	3.3 to 3.7	DIN 7980	50	000000000	00000
							M18	19.0	26.4	3.3 to 3.7	DIN 7980	25	000000000	0000
							M20	21.2	30.6	4.3 to 4.7	DIN 7980	25	000000000	00000
							M22	23.5	32.9	4.3 to 4.7	DIN 7980	10	000000000	0000
							M24	25.5	35.9	4.8 to 5.2	DIN 7980	10	000000000	00000
							M27	28.5	38.9	4.8 to 5.2	DIN 7980	5	000000000	0000
	M30						31.7	44.1	5.8 to 6.2	DIN 7980	5	000000000	00000
	M36	37.7					52.2	6.7 to 7.3	DIN 7980	1	000000000	0000
	M42	43.7					60.2	7.7 to 8.3	DIN 7980	1	000000000	00000
	M48	50.5					67.0	7.7 to 8.3	DIN 7980	1	000000000	00000

Split Lock Washer Assortments

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

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	000000000	0000000

	Steel


			755	For M3 to M20 Screw Sizes	DIN 127B	Plastic Box	000000000	00000

Tooth Lock Washers

Grip tighter than split lock washers to prevent nuts and screws from loosening in applications with constant movement, such as conveyors. Tooth lock washers typically can't be reused because the teeth often get bent when tightened.

External Tooth

Teeth on the outside edge bite into both the fastener and the mating surface for a stronger hold than internal-tooth lock washers. However, they may mar your material and snag on objects. Pair these washers with nuts and screws that are large enough to make contact with the teeth, such as pan, button, and binding head screws.

Super-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.

DIN 6798—Best for slightly bumpy or irregular surfaces because the teeth are angled to make even contact with the material.

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


		M2	2.2	4.5	0.2 to 0.4	DIN 6798	100	000000000	00000
		M2	2.3	4.5	0.2 to 0.4	DIN 6797	100	000000000	0000
		M2.5	2.7	5.5	0.3 to 0.5	DIN 6798	100	000000000	0000
		M2.5	2.8	5.5	0.3 to 0.5	DIN 6797	100	000000000	0000
		M3	3.2	6.0	0.3 to 0.5	DIN 6797	100	000000000	0000
		M3	3.2	6.0	0.3 to 0.5	DIN 6798	100	000000000	0000
		M3.5	3.9	7.0	0.4 to 0.6	DIN 6797	100	000000000	0000
		M4	4.3	8.0	0.4 to 0.6	DIN 6797	100	000000000	0000
		M4	4.3	8.0	0.4 to 0.6	DIN 6798	100	000000000	0000
		M5	5.3	10.0	0.5 to 0.7	DIN 6797	100	000000000	0000
		M5	5.3	10.0	0.5 to 0.7	DIN 6798	100	000000000	0000
		M6	6.4	11.0	0.6 to 0.8	DIN 6797	100	000000000	0000
		M6	6.4	11.0	0.6 to 0.8	DIN 6798	100	000000000	0000
		M7	7.4	12.5	0.7 to 0.9	DIN 6797	100	000000000	0000
		M8	8.4	15.0	0.7 to 0.9	DIN 6797	100	000000000	0000
		M8	8.4	15.0	0.7 to 0.9	DIN 6798	100	000000000	0000
		M10	10.5	18.0	0.8 to 1.0	DIN 6797	100	000000000	0000
		M10	10.5	18.0	0.8 to 1.0	DIN 6798	100	000000000	00000
		M12	13.0	20.5	0.9 to 1.2	DIN 6797	50	000000000	0000
		M12	13.0	20.5	0.9 to 1.2	DIN 6798	50	000000000	0000
		M14	15.0	24.0	0.9 to 1.2	DIN 6797	50	000000000	00000
		M16	17.0	26.0	1.0 to 1.4	DIN 6798	50	000000000	0000
		M16	17.3	26.0	1.0 to 1.4	DIN 6797	50	000000000	00000
		M18	19.0	30.0	1.2 to 1.6	DIN 6797	10	000000000	0000
		M20	21.0	33.0	1.2 to 1.5	DIN 6798	10	000000000	0000
		M20	21.0	33.0	1.2 to 1.6	DIN 6797	10	000000000	0000
		M22	23.0	36.0	1.3 to 1.7	DIN 6797	10	000000000	0000
		M24	25.0	38.0	1.3 to 1.7	DIN 6797	10	000000000	00000
		M24	25.0	38.0	1.4 to 1.6	DIN 6798	10	000000000	0000
		M30	31.0	48.0	1.4 to 1.8	DIN 6797	10	000000000	00000

		Super-Corrosion-Resistant 316 Stainless Steel


				M3	3.2	6.0	0.3 to 0.5	DIN 6797	5	000000000	0000
				M4	4.3	8.0	0.4 to 0.6	DIN 6797	5	000000000	0000
				M5	5.3	10.0	0.5 to 0.7	DIN 6797	5	000000000	0000
				M6	6.4	11.0	0.6 to 0.8	DIN 6797	5	000000000	0000
				M8	8.4	15.0	0.7 to 0.9	DIN 6797	5	000000000	00000
				M10	10.5	18.0	0.8 to 1.0	DIN 6797	1	000000000	0000
				M12	13.0	20.5	0.9 to 1.2	DIN 6797	1	000000000	00000
				M14	15.0	24.0	0.9 to 1.2	DIN 6797	1	000000000	00000
				M16	17.3	26.0	1.0 to 1.4	DIN 6797	1	000000000	00000
				M20	21.0	33.0	1.2 to 1.6	DIN 6797	1	000000000	00000

				Zinc-Plated Steel


						M2	2.3	4.5	0.2 to 0.4	DIN 6797	100	000000000	0000
						M2.5	2.8	5.5	0.3 to 0.5	DIN 6797	100	000000000	0000
						M3	3.2	6.0	0.3 to 0.5	DIN 6797	100	000000000	0000
						M3	3.2	6.0	0.4 to 0.5	DIN 6798	100	000000000	0000
						M3.5	3.9	7.0	0.9 to 1.2	DIN 6797	100	000000000	0000
						M4	4.3	8.0	0.4 to 0.6	DIN 6797	100	000000000	0000
						M4	4.3	8.0	0.5 to 0.6	DIN 6798	100	000000000	0000
						M5	5.3	10.0	0.5 to 0.7	DIN 6797	100	000000000	0000
						M5	5.3	10.0	0.6 to 0.7	DIN 6798	100	000000000	0000
						M6	6.4	11.0	0.6 to 0.8	DIN 6797	100	000000000	0000
						M6	6.4	11.0	0.7 to 0.8	DIN 6798	100	000000000	0000
						M7	7.4	12.5	0.7 to 0.9	DIN 6797	25	000000000	0000
						M8	8.4	15.0	0.7 to 0.9	DIN 6797	100	000000000	0000
						M8	8.4	15.0	0.75 to 0.85	DIN 6798	100	000000000	0000
M10						10.5	18.0	0.8 to 1.0	DIN 6797	50	000000000	0000
M10	10.5					18.0	0.9 to 1.0	DIN 6798	50	000000000	0000
M12	13.0					20.5	0.9 to 1.2	DIN 6797	25	000000000	0000
M12	13.0					20.5	1.0 to 1.2	DIN 6798	50	000000000	0000
M14	15.0					24.0	0.9 to 1.2	DIN 6797	25	000000000	0000
M16	17.3					26.0	1.0 to 1.4	DIN 6797	25	000000000	0000
M18	19.0					30.0	1.2 to 1.6	DIN 6797	5	000000000	0000
M20	21.0					33.0	1.2 to 1.6	DIN 6797	5	000000000	0000
M22	23.0					36.0	1.3 to 1.7	DIN 6797	5	000000000	0000
M24	25.0					38.0	1.3 to 1.7	DIN 6797	5	000000000	0000
M30	31.0					48.0	1.4 to 1.8	DIN 6797	5	000000000	0000

Internal Tooth

Internal teeth dig into the nut or screw to prevent it from backing out. Unlike external-tooth lock washers, these have a smooth outside edge, so they are less likely to mar your material or snag on objects. However, they don’t grip quite as well. Pair them with fasteners that have small diameters, such as fillister and cheese head screws.

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

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


	M2	2.2	4.5	0.2 to 0.4	DIN 6797	100	000000000	00000
	M2.3	2.5	5.0	0.2 to 0.4	DIN 6797	100	000000000	0000
	M2.5	2.7	5.5	0.2 to 0.5	DIN 6797	100	000000000	0000
	M3	3.2	6.0	0.3 to 0.5	DIN 6797	100	000000000	0000
	M3.5	3.7	7.0	0.4 to 0.6	DIN 6797	100	000000000	0000
	M4	4.3	8.0	0.4 to 0.6	DIN 6797	100	000000000	0000
	M5	5.3	10.0	0.5 to 0.7	DIN 6797	100	000000000	0000
	M6	6.4	11.0	0.6 to 0.8	DIN 6797	100	000000000	0000
	M7	7.4	12.5	0.7 to 0.9	DIN 6797	50	000000000	00000
	M8	8.4	15.0	0.7 to 0.9	DIN 6797	100	000000000	0000
	M10	10.5	18.0	0.8 to 1.0	DIN 6797	50	000000000	0000
	M12	13.0	20.5	0.9 to 1.2	DIN 6797	50	000000000	0000
	M14	15.0	24.0	0.9 to 1.2	DIN 6797	25	000000000	0000
	M16	17.0	26.0	1.0 to 1.4	DIN 6797	25	000000000	0000
	M18	19.0	30.0	1.2 to 1.5	DIN 6797	10	000000000	0000
	M20	21.0	33.0	1.2 to 1.5	DIN 6797	10	000000000	0000
	M22	23.0	36.0	1.3 to 1.6	DIN 6797	10	000000000	0000
	M24	25.0	38.0	1.3 to 1.6	DIN 6797	10	000000000	00000

	Zinc-Plated Steel


			M2	2.2	4.5	0.2 to 0.4	DIN 6797	100	000000000	0000
			M2.5	2.7	5.5	0.2 to 0.5	DIN 6797	100	000000000	0000
			M3	3.2	6.0	0.3 to 0.5	DIN 6797	100	000000000	0000
			M3.5	3.7	7.0	0.4 to 0.6	DIN 6797	100	000000000	0000
			M4	4.3	8.0	0.4 to 0.6	DIN 6797	100	000000000	0000
			M5	5.3	10.0	0.5 to 0.7	DIN 6797	100	000000000	0000
			M6	6.4	11.0	0.6 to 0.8	DIN 6797	100	000000000	0000
			M7	7.4	12.5	0.7 to 0.9	DIN 6797	100	000000000	0000
			M8	8.4	15.0	0.7 to 0.9	DIN 6797	100	000000000	0000
			M10	10.5	18.0	0.8 to 1.0	DIN 6797	50	000000000	0000
			M12	13.0	20.5	0.9 to 1.2	DIN 6797	50	000000000	00000
			M14	15.0	24.0	0.9 to 1.2	DIN 6797	25	000000000	0000
			M16	17.0	26.0	1.0 to 1.4	DIN 6797	25	000000000	0000
			M18	19.0	30.0	1.2 to 1.5	DIN 6797	10	000000000	0000
			M20	21.0	33.0	1.2 to 1.5	DIN 6797	10	000000000	00000
			M24	25.0	38.0	1.3 to 1.6	DIN 6797	10	000000000	00000

			Black-Oxide Steel


					M2	2.2	4.5	0.2 to 0.4	DIN 6797	100	000000000	0000
					M2.5	2.7	5.5	0.2 to 0.5	DIN 6797	100	000000000	0000
					M2.6	2.8	5.5	0.3 to 0.5	DIN 6797	100	000000000	0000
					M3	3.2	6.0	0.3 to 0.5	DIN 6797	100	000000000	0000
					M3.5	3.7	7.0	0.4 to 0.6	DIN 6797	100	000000000	0000
					M4	4.3	8.0	0.4 to 0.6	DIN 6797	100	000000000	0000
					M5	5.3	10.0	0.5 to 0.7	DIN 6797	100	000000000	0000
					M6	6.4	11.0	0.6 to 0.8	DIN 6797	100	000000000	0000
					M8	8.4	15.0	0.7 to 0.9	DIN 6797	100	000000000	0000
					M10	10.5	18.0	0.8 to 1.0	DIN 6797	50	000000000	0000
					M12	13.0	20.5	0.9 to 1.2	DIN 6797	50	000000000	0000
					M14	15.0	24.0	0.9 to 1.2	DIN 6797	25	000000000	0000
					M16	17.0	26.0	1.0 to 1.4	DIN 6797	25	000000000	0000
					M18	19.0	30.0	1.2 to 1.5	DIN 6797	10	000000000	0000
					M20	21.0	33.0	1.2 to 1.5	DIN 6797	10	000000000	00000

Internal and External Tooth

The strongest hold of all our tooth lock washers, these combine internal and external teeth to boost gripping power. However, the teeth may mar your material and snag on objects. Pair these washers with fasteners that are large enough to make contact with the external teeth, such as pan, button, and binding head screws.

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

	ID, mm	OD, mm	Thk., mm	Pkg. Qty.		Pkg.
Zinc-Plated Steel


	M3	3.200	12.000	1.400 to 1.700	50	000000000	000000
	M4	4.300	15.000	1.900 to 2.300	50	000000000	00000
	M4	4.300	18.000	2.200 to 2.600	25	000000000	0000
	M5	5.300	18.000	2.200 to 2.600	25	000000000	00000
	M6	6.500	18.000	2.200 to 2.600	25	000000000	00000
	M8	8.500	22.000	2.700 to 3.300	25	000000000	00000
	M10	10.500	26.000	2.700 to 3.300	10	000000000	00000
	M12	12.500	30.000	3.200 to 4.000	10	000000000	00000
	M16	16.500	35.000	3.800 to 4.600	5	000000000	00000

Countersunk Tooth Lock Washers

These washers grip flat- and oval-head countersunk screws, so you get a secure hold without overtightening. They resist loosening in applications with constant motion, such as conveyors. Tooth lock washers typically can't be reused because the teeth often get bent when tightened.

External Tooth

Teeth on the outside edge bite into both the screw head and the mating surface to lock the assembly in place.

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

DIN 6798—Best for slightly bumpy or irregular surfaces because the teeth are angled to make even contact with the material.

	ID, mm	OD, mm	Thk., mm	Countersink Angle	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel


	M3	3.2	6.0	0.15 to 0.25	90°	DIN 6798	100	00000000	000000
	M4	4.3	8.0	0.20 to 0.30	90°	DIN 6798	100	00000000	00000
	M5	5.3	9.8	0.25 to 0.35	90°	DIN 6798	50	00000000	00000
	M6	6.4	11.8	0.35 to 0.45	90°	DIN 6798	50	00000000	0000
	M8	8.4	15.3	0.35 to 0.45	90°	DIN 6798	50	00000000	00000
	M10	10.5	19.0	0.45 to 0.55	90°	DIN 6798	25	00000000	0000
	M12	13.0	23.0	0.45 to 0.55	90°	DIN 6798	25	00000000	00000

Wave Spring Lock Washers

The wavy shape flexes like a spring to keep nuts and screws secure on slightly uneven surfaces. These washers add a small amount of tension to stop fasteners from backing out due to mild vibration. While they don't hold as well as other lock washers, they do grip slightly better than curved washers. They work best in electrical panels, light fixtures, and other light duty assemblies. Since these washers hold their shape when untightened, you can reuse them a handful of times without losing strength.

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

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

	No. of Waves	ID, mm	OD, mm	Thk., mm	Overall Ht., mm	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel


	M4	1	4.4	7.6	0.7	1.4	DIN 128B	50	000000000	000000
	M5	1	5.4	9.2	0.9	1.7	DIN 128B	25	000000000	0000
	M6	1	6.5	11.8	1.2	2.2	DIN 128B	25	000000000	0000
	M8	1	8.5	14.8	1.5	2.7	DIN 128B	25	000000000	0000
	M10	1	10.7	18.1	1.7	3.1	DIN 128B	25	000000000	00000
	M12	1	12.7	21.1	1.9	3.6	DIN 128B	10	000000000	0000
	M16	1	17.0	27.4	2.6	5.1	DIN 128B	1	000000000	0000

	Zinc-Plated Steel


			M3	1	3.1	6.2	0.6	1.1	DIN 128B	100	000000000	0000
			M4	1	4.1	7.6	0.7	1.2	DIN 128B	100	000000000	0000
			M5	1	5.1	9.2	0.9	1.5	DIN 128B	100	000000000	0000
			M6	1	6.1	11.8	1.2	2	DIN 128B	100	000000000	00000
			M8	1	8.1	14.8	1.5	2.5	DIN 128B	100	000000000	00000
			M10	1	10.2	18.1	1.7	2.9	DIN 128B	50	000000000	00000
			M12	1	12.2	21.1	2.0	3.4	DIN 128B	25	000000000	0000
			M14	1	14.2	24.1	2.4	3.9	DIN 128B	25	000000000	00000
			M16	1	16.2	27.4	2.7	4.5	DIN 128B	25	000000000	00000
			M18	1	18.2	29.4	2.7	4.5	DIN 128B	10	000000000	0000
			M22	1	22.5	35.9	3.0	5.1	DIN 128B	5	000000000	0000
			M24	1	24.5	40.0	3.8	6.5	DIN 128B	5	000000000	00000

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.

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	000000000	00000
	M3	3.1	6.2	0.6	1.1	DIN 128A	100	000000000	0000
	M4	4.1	7.6	0.7	1.2	DIN 128A	100	000000000	0000
	M5	5.1	9.2	0.9	1.5	DIN 128A	100	000000000	00000
	M6	6.1	11.8	1.2	2	DIN 128A	100	000000000	00000
	M8	8.1	14.8	1.5	2.5	DIN 128A	50	000000000	0000
	M10	10.2	18.1	1.7	2.9	DIN 128A	50	000000000	00000
	M12	12.2	21.1	2.0	3.4	DIN 128A	50	000000000	00000
	M14	14.2	24.1	2.3	3.9	DIN 128A	25	000000000	00000
	M16	16.2	27.4	2.7	4.5	DIN 128A	20	000000000	00000
	M18	18.2	29.4	2.7	4.5	DIN 128A	10	000000000	00000
	M20	20.2	33.6	3.0	5.1	DIN 128A	10	000000000	00000
	M22	22.5	35.9	3.0	5.1	DIN 128A	5	000000000	00000
	M24	24.5	40.0	3.8	6.5	DIN 128A	5	000000000	00000

	Zinc-Plated Steel


			M2.5	2.6	5.1	0.5	0.9	DIN 128A	100	000000000	00000
			M3	3.1	6.2	0.6	1.1	DIN 128A	100	000000000	0000
			M4	4.1	7.6	0.7	1.2	DIN 128A	100	000000000	0000
			M5	5.1	9.2	0.9	1.5	DIN 128A	100	000000000	0000
			M6	6.1	11.8	1.2	2	DIN 128A	100	000000000	00000
			M8	8.1	14.8	1.5	2.5	DIN 128A	100	000000000	00000
			M10	10.2	18.1	1.7	2.9	DIN 128A	100	000000000	00000
			M12	12.2	21.1	2.0	3.4	DIN 128A	50	000000000	00000
			M14	14.2	24.1	2.3	3.9	DIN 128A	25	000000000	00000
			M16	16.2	27.4	2.7	4.5	DIN 128A	25	000000000	00000
			M18	18.2	29.4	2.7	4.5	DIN 128A	10	000000000	0000
			M20	20.2	33.6	3.0	5.1	DIN 128A	10	000000000	00000
			M22	22.5	35.9	3.0	5.1	DIN 128A	10	000000000	00000
			M24	24.5	40.0	3.8	6.5	DIN 128A	10	000000000	00000
			M30	30.5	48.2	5.8	9.5	DIN 128A	1	000000000	0000

			Zinc-Yellow-Chromate-Plated Steel


					M3	3.1	6.2	0.6	1.1	DIN 128A	100	000000000	0000
					M3.5	3.6	6.7	0.6	1.1	DIN 128A	100	000000000	0000
					M4	4.1	7.6	0.7	1.2	DIN 128A	100	000000000	0000
					M5	5.1	9.2	0.9	1.5	DIN 128A	100	000000000	0000
					M6	6.1	11.8	1.2	2	DIN 128A	100	000000000	0000
					M8	8.1	14.8	1.5	2.5	DIN 128A	100	000000000	0000
					M10	10.2	18.1	1.7	2.9	DIN 128A	100	000000000	00000
					M12	12.2	21.1	2.0	3.4	DIN 128A	50	000000000	0000
					M14	14.2	24.1	2.3	3.9	DIN 128A	25	000000000	00000
					M16	16.2	27.4	2.7	4.5	DIN 128A	10	000000000	00000
					M20	20.2	33.6	3.0	5.1	DIN 128A	10	000000000	00000

					Black-Oxide Steel


							M3	3.1	6.2	0.6	1.1	DIN 128A	100	000000000	0000
							M4	4.1	7.6	0.7	1.2	DIN 128A	100	000000000	0000
							M5	5.1	9.2	0.9	1.5	DIN 128A	100	000000000	0000
							M6	6.1	11.8	1.2	2	DIN 128A	50	000000000	0000
							M8	8.1	14.8	1.5	2.5	DIN 128A	50	000000000	0000
							M10	10.2	18.1	1.7	2.9	DIN 128A	25	000000000	00000
							M12	12.2	21.1	2.0	3.4	DIN 128A	10	000000000	0000
							M16	16.2	27.4	2.7	4.5	DIN 128A	10	000000000	0000
							M20	20.2	33.6	3.0	5.1	DIN 128A	5	000000000	0000
							M24	24.5	40.0	3.8	6.5	DIN 128A	5	000000000	00000

Steel


							M2.5	2.3	4.6	0.6	1.1	DIN 6905	200	000000000	0000
							M3	2.7	5.6	0.7	1.3	DIN 6905	200	000000000	0000
							M4	3.6	7.0	0.8	1.4	DIN 6905	200	000000000	00000
							M5	4.6	8.6	1.0	1.7	DIN 6905	100	000000000	00000
							M6	5.5	11.0	1.3	2.2	DIN 6905	50	000000000	00000
							M8	7.4	14.0	1.6	2.8	DIN 6905	50	000000000	00000
							M10	9.3	17.0	1.8	3.2	DIN 6905	10	000000000	00000
							M12	11.0	19.7	2.1	3.7	DIN 6905	10	000000000	00000

Tab Lock Washers

1 Tab

Instead of relying on friction, these washers lock mechanically for more holding power than split and tooth lock washers. Bend the tabs with a wrench to stop both the fastener and washer from rotating. They are often used in applications with moderate vibration, such as motors, mixers, and pumps. These washers are not reusable because the tabs will weaken if you bend them repeatedly.

1 Tab—Bend the tab down over the edge of your mounting surface, and bend the side of the washer up against the nut or screw.

	ID, mm	OD, mm	Thk., mm	No. of Tabs	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel


	M4	4.3	14	0.38	1	DIN 93	100	000000000	000000
	M5	5.3	17	0.5	1	DIN 93	50	000000000	00000
	M6	6.4	19	0.5	1	DIN 93	50	000000000	00000
	M8	8.4	22	0.75	1	DIN 93	25	000000000	00000
	M10	10.5	26	0.75	1	DIN 93	25	000000000	00000
	M12	13	30	1	1	DIN 93	10	000000000	0000