Metal Lock Washers | McMaster-Carr

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458 Products

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Tooth

Grip better than split lock washers in applications with constant movement

426 products

Countersunk

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

31 products

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Domed

Spread pressure over a large area to limit damage to material

6 products

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Resist loosening from moderate vibration, such as pumps

32 products

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.

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.

Wear-Resistant 400 Series Stainless Steel—These grip hard material better than other types of stainless steel. They are not as corrosion resistant as 18-8 and 316 stainless steel, so they are best for environments that experience occasional moisture.

Zinc-Plated Steel—A common choice for areas with 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.

Super-Corrosion-Resistant Phosphor Bronze—Stronger and more wear resistant than silicon bronze, but with the same excellent corrosion resistance. These washers won't rust or deteriorate when submerged in salt water, so they're a good fit for marine environments.

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



		No. 2	0.086"	0.189"	0.010" to 0.013"	ASME B18.21.1	100	95584A311	00000
		No. 4	0.115"	0.260"	0.012" to 0.018"	ASME B18.21.1	100	95584A200	0000
		No. 6	0.141"	0.320"	0.016" to 0.022"	ASME B18.21.1	100	95584A201	0000
		No. 8	0.168"	0.381"	0.018" to 0.023"	ASME B18.21.1	100	95584A203	0000
		No. 10	0.195"	0.410"	0.018" to 0.024"	ASME B18.21.1	100	95584A205	0000
		No. 12	0.221"	0.475"	0.020" to 0.027"	ASME B18.21.1	100	95584A511	0000
		1/4"	0.256"	0.510"	0.023" to 0.028"	ASME B18.21.1	100	95584A207	0000
		5/16"	0.320"	0.610"	0.028" to 0.034"	ASME B18.21.1	50	95584A209	0000
		3/8"	0.384"	0.694"	0.032" to 0.040"	ASME B18.21.1	25	95584A211	0000
		1/2"	0.513"	0.900"	0.037" to 0.045"	ASME B18.21.1	50	95584A512	0000


		5/8"	0.641"	1.070"	0.042" to 0.050"	ASME B18.21.1	10	95584A312	0000
		3/4"	0.768"	1.260"	0.047" to 0.055"	ASME B18.21.1	5	95584A313	0000
		M2	2.2 mm	4.5 mm	0.2 mm to 0.4 mm	DIN 6798	100	91120A311	0000
		M2	2.3 mm	4.5 mm	0.2 mm to 0.4 mm	DIN 6797	100	95060A510	0000
		M2.5	2.7 mm	5.5 mm	0.3 mm to 0.5 mm	DIN 6798	100	91120A312	0000
		M2.5	2.8 mm	5.5 mm	0.3 mm to 0.5 mm	DIN 6797	100	95060A520	0000
		M3	3.2 mm	6.0 mm	0.3 mm to 0.5 mm	DIN 6797	100	95060A320	0000
		M3	3.2 mm	6.0 mm	0.3 mm to 0.5 mm	DIN 6798	100	91120A120	0000
		M3.5	3.9 mm	7.0 mm	0.4 mm to 0.6 mm	DIN 6797	100	95060A530	0000
		M4	4.3 mm	8.0 mm	0.4 mm to 0.6 mm	DIN 6797	100	95060A330	0000


		M4	4.3 mm	8.0 mm	0.4 mm to 0.6 mm	DIN 6798	100	91120A130	0000
		M5	5.3 mm	10.0 mm	0.5 mm to 0.7 mm	DIN 6797	100	95060A350	0000
		M5	5.3 mm	10.0 mm	0.5 mm to 0.7 mm	DIN 6798	100	91120A140	0000
		M6	6.4 mm	11.0 mm	0.6 mm to 0.8 mm	DIN 6797	100	95060A360	0000
		M6	6.4 mm	11.0 mm	0.6 mm to 0.8 mm	DIN 6798	100	91120A160	0000
		M7	7.4 mm	12.5 mm	0.7 mm to 0.9 mm	DIN 6797	100	95060A460	0000
		M8	8.4 mm	15.0 mm	0.7 mm to 0.9 mm	DIN 6797	100	95060A390	0000
		M8	8.4 mm	15.0 mm	0.7 mm to 0.9 mm	DIN 6798	100	91120A180	0000
		M10	10.5 mm	18.0 mm	0.8 mm to 1.0 mm	DIN 6797	100	95060A400	0000
		M10	10.5 mm	18.0 mm	0.8 mm to 1.0 mm	DIN 6798	100	91120A200	00000


		M12	13.0 mm	20.5 mm	0.9 mm to 1.2 mm	DIN 6797	50	95060A411	0000
		M12	13.0 mm	20.5 mm	0.9 mm to 1.2 mm	DIN 6798	50	91120A211	0000
		M14	15.0 mm	24.0 mm	0.9 mm to 1.2 mm	DIN 6797	50	95060A420	0000
		M16	17.0 mm	26.0 mm	1.0 mm to 1.4 mm	DIN 6798	50	91120A235	0000
		M16	17.3 mm	26.0 mm	1.0 mm to 1.4 mm	DIN 6797	50	95060A540	00000
		M18	19.0 mm	30.0 mm	1.2 mm to 1.6 mm	DIN 6797	10	95060A440	0000
		M20	21.0 mm	33.0 mm	1.2 mm to 1.5 mm	DIN 6798	10	91120A241	0000
		M20	21.0 mm	33.0 mm	1.2 mm to 1.6 mm	DIN 6797	10	95060A450	0000
		M22	23.0 mm	36.0 mm	1.3 mm to 1.7 mm	DIN 6797	10	95060A470	0000
		M24	25.0 mm	38.0 mm	1.3 mm to 1.7 mm	DIN 6797	10	95060A480	00000


		M24	25.0 mm	38.0 mm	1.4 mm to 1.6 mm	DIN 6798	10	91120A245	0000
		M30	31.0 mm	48.0 mm	1.4 mm to 1.8 mm	DIN 6797	10	95060A500	00000


		Black-Oxide 18-8 Stainless Steel



				No. 6	0.141"	0.320"	0.016" to 0.022"	ASME B18.21.1	100	95584A314	0000
				No. 8	0.168"	0.381"	0.018" to 0.023"	ASME B18.21.1	100	95584A315	0000
				No. 10	0.195"	0.410"	0.018" to 0.024"	ASME B18.21.1	100	95584A316	0000
				1/4"	0.256"	0.510"	0.023" to 0.028"	ASME B18.21.1	100	95584A317	0000
				5/16"	0.320"	0.610"	0.028" to 0.034"	ASME B18.21.1	100	95584A318	0000
3/8"				0.384"	0.694"	0.032" to 0.040"	ASME B18.21.1	100	95584A319	00000


Super-Corrosion-Resistant 316 Stainless Steel



				No. 4	0.115"	0.260"	0.012" to 0.018"	ASME B18.21.1	10	90375A005	0000
				No. 6	0.141"	0.320"	0.016" to 0.022"	ASME B18.21.1	10	90375A007	0000
				No. 8	0.168"	0.381"	0.018" to 0.023"	ASME B18.21.1	10	90375A009	0000
				No. 10	0.195"	0.410"	0.018" to 0.024"	ASME B18.21.1	10	90375A011	0000
				1/4"	0.256"	0.510"	0.023" to 0.028"	ASME B18.21.1	25	90375A110	0000
				5/16"	0.320"	0.610"	0.028" to 0.034"	ASME B18.21.1	25	90375A120	0000
				3/8"	0.384"	0.694"	0.032" to 0.040"	ASME B18.21.1	10	90375A130	0000
				1/2"	0.513"	0.900"	0.037" to 0.045"	ASME B18.21.1	10	90375A140	0000
				M3	3.2 mm	6.0 mm	0.3 mm to 0.5 mm	DIN 6797	5	90412A110	0000
				M4	4.3 mm	8.0 mm	0.4 mm to 0.6 mm	DIN 6797	5	90412A120	0000


				M5	5.3 mm	10.0 mm	0.5 mm to 0.7 mm	DIN 6797	5	90412A130	0000
				M6	6.4 mm	11.0 mm	0.6 mm to 0.8 mm	DIN 6797	5	90412A140	0000
				M8	8.4 mm	15.0 mm	0.7 mm to 0.9 mm	DIN 6797	5	90412A150	0000
				M10	10.5 mm	18.0 mm	0.8 mm to 1.0 mm	DIN 6797	1	90412A160	0000
				M12	13.0 mm	20.5 mm	0.9 mm to 1.2 mm	DIN 6797	1	90412A170	0000
				M14	15.0 mm	24.0 mm	0.9 mm to 1.2 mm	DIN 6797	1	90412A180	0000
				M16	17.3 mm	26.0 mm	1.0 mm to 1.4 mm	DIN 6797	1	90412A190	0000
				M20	21.0 mm	33.0 mm	1.2 mm to 1.6 mm	DIN 6797	1	90412A200	0000


				Wear-Resistant 400 Series Stainless Steel



						No. 2	0.096"	0.195"	0.010" to 0.016"	—	100	98438A200	0000
						No. 3	0.102"	0.235"	0.010" to 0.016"	ASME B18.21.1	100	98438A205	0000
						No. 4	0.115"	0.260"	0.012" to 0.018"	ASME B18.21.1	100	98438A210	0000
						No. 5	0.129"	0.285"	0.014" to 0.020"	ASME B18.21.1	100	98438A215	0000
						No. 6	0.141"	0.320"	0.016" to 0.022"	ASME B18.21.1	100	98438A220	0000
						No. 8	0.168"	0.381"	0.018" to 0.023"	ASME B18.21.1	100	98438A225	0000
						No. 10	0.195"	0.410"	0.018" to 0.024"	ASME B18.21.1	100	98438A230	0000
						No. 12	0.221"	0.475"	0.020" to 0.027"	ASME B18.21.1	100	98438A235	0000
						1/4"	0.256"	0.510"	0.023" to 0.028"	ASME B18.21.1	100	98438A240	0000
						5/16"	0.320"	0.610"	0.028" to 0.034"	ASME B18.21.1	100	98438A030	0000


						3/8"	0.384"	0.694"	0.032" to 0.040"	ASME B18.21.1	50	98438A031	0000
						7/16"	0.448"	0.760"	0.032" to 0.040"	ASME B18.21.1	50	98438A032	0000
						1/2"	0.513"	0.900"	0.037" to 0.045"	ASME B18.21.1	25	98438A033	0000
						9/16"	0.576"	0.985"	0.037" to 0.045"	ASME B18.21.1	25	93419A111	0000
						5/8"	0.641"	1.070"	0.042" to 0.050"	ASME B18.21.1	25	98438A035	0000
						3/4"	0.768"	1.260"	0.047" to 0.055"	ASME B18.21.1	25	98438A036	00000
						7/8"	0.897"	1.410"	0.052" to 0.060"	ASME B18.21.1	5	93419A112	0000
						1"	1.025"	1.620"	0.059" to 0.067"	ASME B18.21.1	5	93419A113	0000


						Zinc-Plated Steel



			No. 2				0.086"	0.195"	0.010" to 0.016"	—	100	91114A003	0000
			No. 3				0.102"	0.235"	0.010" to 0.016"	ASME B18.21.1	100	91114A004	0000
			No. 4				0.115"	0.260"	0.012" to 0.018"	ASME B18.21.1	100	91114A005	0000
			No. 6				0.141"	0.320"	0.016" to 0.022"	ASME B18.21.1	100	91114A007	0000
			No. 8				0.168"	0.381"	0.018" to 0.023"	ASME B18.21.1	100	91114A009	0000
			No. 10				0.195"	0.410"	0.018" to 0.024"	ASME B18.21.1	100	91114A011	0000
			No. 12				0.221"	0.475"	0.020" to 0.027"	ASME B18.21.1	100	91114A013	0000
			1/4"				0.256"	0.510"	0.023" to 0.028"	ASME B18.21.1	100	91114A029	0000
			5/16"				0.320"	0.610"	0.028" to 0.034"	ASME B18.21.1	100	91114A030	0000
3/8"			0.384"				0.694"	0.032" to 0.040"	ASME B18.21.1	100	91114A031	0000


7/16"	0.448"		0.760"				0.032" to 0.040"	ASME B18.21.1	100	91114A032	00000
1/2"	0.513"		0.900"				0.037" to 0.045"	ASME B18.21.1	100	91114A033	00000
9/16"	0.576"		0.985"				0.037" to 0.045"	ASME B18.21.1	25	91114A034	0000
5/8"	0.641"		1.070"				0.042" to 0.050"	ASME B18.21.1	50	91114A035	00000
3/4"	0.768"		1.260"				0.047" to 0.055"	ASME B18.21.1	25	91114A036	00000
7/8"	0.897"		1.410"				0.052" to 0.060"	ASME B18.21.1	25	91114A037	00000
1"	1.025"		1.620"				0.059" to 0.067"	ASME B18.21.1	10	91114A038	00000
M2	2.3 mm		4.5 mm				0.2 mm to 0.4 mm	DIN 6797	100	97985A111	0000
M2.5	2.8 mm		5.5 mm				0.3 mm to 0.5 mm	DIN 6797	100	97985A112	0000
M3	3.2 mm		6.0 mm				0.3 mm to 0.5 mm	DIN 6797	100	97985A520	0000


M3	3.2 mm		6.0 mm				0.4 mm to 0.5 mm	DIN 6798	100	97985A720	0000
M3.5	3.9 mm		7.0 mm				0.9 mm to 1.2 mm	DIN 6797	100	97985A211	0000
M4	4.3 mm		8.0 mm				0.4 mm to 0.6 mm	DIN 6797	100	97985A530	0000
M4	4.3 mm		8.0 mm				0.5 mm to 0.6 mm	DIN 6798	100	97985A730	0000
M5	5.3 mm		10.0 mm				0.5 mm to 0.7 mm	DIN 6797	100	97985A550	0000
M5	5.3 mm		10.0 mm				0.6 mm to 0.7 mm	DIN 6798	100	97985A740	0000
M6	6.4 mm		11.0 mm				0.6 mm to 0.8 mm	DIN 6797	100	97985A560	0000
M6	6.4 mm		11.0 mm				0.7 mm to 0.8 mm	DIN 6798	100	97985A760	0000
M7	7.4 mm		12.5 mm				0.7 mm to 0.9 mm	DIN 6797	25	97985A113	0000
M8	8.4 mm		15.0 mm				0.7 mm to 0.9 mm	DIN 6797	100	97985A590	0000


M8	8.4 mm		15.0 mm	0.8 mm to 0.9 mm	DIN 6798		100	97985A780	0000
M10	10.5 mm		18.0 mm	0.8 mm to 1.0 mm	DIN 6797		50	97985A600	0000
M10	10.5 mm		18.0 mm	0.9 mm to 1.0 mm	DIN 6798		50	97985A800	0000
M12	13.0 mm		20.5 mm	0.9 mm to 1.2 mm	DIN 6797		25	97985A611	0000
M12	13.0 mm		20.5 mm	1.0 mm to 1.2 mm	DIN 6798		50	97985A810	0000
M14	15.0 mm		24.0 mm	0.9 mm to 1.2 mm	DIN 6797		25	97985A620	0000
M16	17.3 mm		26.0 mm	1.0 mm to 1.4 mm	DIN 6797		25	97985A630	0000
M18	19.0 mm		30.0 mm	1.2 mm to 1.6 mm	DIN 6797		5	97985A640	0000
M20	21.0 mm		33.0 mm	1.2 mm to 1.6 mm	DIN 6797		5	97985A650	0000
M22	23.0 mm		36.0 mm	1.3 mm to 1.7 mm	DIN 6797		5	97985A114	0000


M24	25.0 mm		38.0 mm	1.3 mm to 1.7 mm	DIN 6797		5	97985A660	0000
M30	31.0 mm		48.0 mm	1.4 mm to 1.8 mm	DIN 6797		5	97985A116	0000


Black-Oxide Steel



			No. 4	0.115"	0.260"		0.012" to 0.018"	ASME B18.21.1	100	91233A111	0000
			No. 6	0.141"	0.320"		0.016" to 0.022"	ASME B18.21.1	100	91233A112	0000
			No. 8	0.168"	0.381"		0.018" to 0.023"	ASME B18.21.1	100	91233A113	0000
			No. 10	0.195"	0.410"		0.018" to 0.024"	ASME B18.21.1	100	91233A114	0000
			No. 12	0.221"	0.475"		0.020" to 0.027"	ASME B18.21.1	100	91233A115	0000
			1/4"	0.256"	0.510"		0.023" to 0.028"	ASME B18.21.1	100	91233A116	0000
			3/8"	0.384"	0.694"	0.032" to 0.040"	ASME B18.21.1	50	91233A117	0000
		1/2"	0.513"	0.900"	0.037" to 0.045"	ASME B18.21.1	25	91233A118	0000


		Super-Corrosion-Resistant Phosphor Bronze



				No. 3	0.102"	0.235"	0.010" to 0.016"	ASME B18.21.1	100	92164A333	0000
				No. 4	0.115"	0.260"	0.012" to 0.018"	ASME B18.21.1	100	92164A005	0000
				No. 6	0.141"	0.320"	0.016" to 0.022"	ASME B18.21.1	100	92164A007	0000
				No. 8	0.168"	0.381"	0.018" to 0.023"	ASME B18.21.1	100	92164A009	0000
				No. 10	0.195"	0.410"	0.018" to 0.024"	ASME B18.21.1	100	92164A011	0000
				No. 12	0.221"	0.475"	0.020" to 0.027"	ASME B18.21.1	100	92164A334	0000
				1/4"	0.256"	0.510"	0.023" to 0.028"	ASME B18.21.1	100	92164A029	00000
				5/16"	0.320"	0.610"	0.028" to 0.034"	ASME B18.21.1	50	92164A030	0000
				3/8"	0.384"	0.694"	0.032" to 0.040"	ASME B18.21.1	25	92164A031	0000
				7/16"	0.448"	0.760"	0.032" to 0.040"	ASME B18.21.1	25	92164A032	0000


				1/2"	0.513"	0.900"	0.037" to 0.045"	ASME B18.21.1	25	92164A033	00000
				5/8"	0.641"	1.070"	0.042" to 0.050"	ASME B18.21.1	10	92164A040	0000
				3/4"	0.768"	1.260"	0.047" to 0.055"	ASME B18.21.1	5	92164A335	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.

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.

	For Screw Size	ID	OD	Thk.	For Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel



		No. 4	0.115"	0.270"	0.012" to 0.018"	—	ASME B18.21.1	100	91757A101	00000
		No. 6	0.141"	0.295"	0.016" to 0.022"	—	ASME B18.21.1	100	91757A103	0000
		No. 8	0.168"	0.340"	0.018" to 0.023"	—	ASME B18.21.1	100	91757A105	0000
		No. 10	0.195"	0.381"	0.018" to 0.024"	—	ASME B18.21.1	100	91757A107	0000
		No. 12	0.231"	0.410"	0.020" to 0.027"	—	ASME B18.21.1	100	91757A132	0000
		1/4"	0.256"	0.478"	0.023" to 0.028"	—	ASME B18.21.1	100	91757A109	0000
		5/16"	0.320"	0.610"	0.028" to 0.034"	—	ASME B18.21.1	50	91757A111	0000
		3/8"	0.384"	0.692"	0.032" to 0.040"	—	ASME B18.21.1	25	91757A113	0000
		1/2"	0.512"	0.900"	0.037" to 0.045"	—	ASME B18.21.1	10	91757A117	0000
		9/16"	0.576"	0.985"	0.037" to 0.045"	—	ASME B18.21.1	10	91757A122	0000


		5/8"	0.640"	1.071"	0.042" to 0.050"	—	ASME B18.21.1	10	91757A128	0000
		3/4"	0.769"	1.245"	0.047" to 0.055"	—	ASME B18.21.1	5	91757A131	0000
		M2	2.2 mm	4.5 mm	0.2 mm to 0.4 mm	—	DIN 6797	100	93925A210	0000
		M2.3	2.5 mm	5.0 mm	0.2 mm to 0.4 mm	—	DIN 6797	100	93925A411	0000
		M2.5	2.7 mm	5.5 mm	0.2 mm to 0.5 mm	—	DIN 6797	100	93925A220	0000
		M3	3.2 mm	6.0 mm	0.3 mm to 0.5 mm	—	DIN 6797	100	93925A240	0000
		M3.5	3.7 mm	7.0 mm	0.4 mm to 0.6 mm	—	DIN 6797	100	93925A221	0000
		M4	4.3 mm	8.0 mm	0.4 mm to 0.6 mm	—	DIN 6797	100	93925A250	0000
		M5	5.3 mm	10.0 mm	0.5 mm to 0.7 mm	—	DIN 6797	100	93925A260	0000
		M6	6.4 mm	11.0 mm	0.6 mm to 0.8 mm	—	DIN 6797	100	93925A270	0000


		M7	7.4 mm	12.5 mm	0.7 mm to 0.9 mm	—	DIN 6797	50	93925A412	00000
		M8	8.4 mm	15.0 mm	0.7 mm to 0.9 mm	—	DIN 6797	100	93925A280	0000
		M10	10.5 mm	18.0 mm	0.8 mm to 1.0 mm	—	DIN 6797	50	93925A290	0000
		M12	13.0 mm	20.5 mm	0.9 mm to 1.2 mm	—	DIN 6797	50	93925A300	0000
		M14	15.0 mm	24.0 mm	0.9 mm to 1.2 mm	—	DIN 6797	25	93925A310	0000
		M16	17.0 mm	26.0 mm	1.0 mm to 1.4 mm	—	DIN 6797	25	93925A320	0000
		M18	19.0 mm	30.0 mm	1.2 mm to 1.5 mm	—	DIN 6797	10	93925A330	0000
		M20	21.0 mm	33.0 mm	1.2 mm to 1.5 mm	—	DIN 6797	10	93925A340	0000
		M22	23.0 mm	36.0 mm	1.3 mm to 1.6 mm	—	DIN 6797	10	93925A413	0000
		M24	25.0 mm	38.0 mm	1.3 mm to 1.6 mm	—	DIN 6797	10	93925A414	00000


		Super-Corrosion-Resistant 316 Stainless Steel



				No. 4	0.115"	0.270"	0.012" to 0.018"	—	ASME B18.21.1	5	91108A110	0000
				No. 6	0.141"	0.295"	0.016" to 0.022"	—	ASME B18.21.1	5	91108A140	0000
				No. 8	0.168"	0.340"	0.018" to 0.023"	—	ASME B18.21.1	5	91108A220	0000
				No. 10	0.195"	0.381"	0.018" to 0.024"	—	ASME B18.21.1	5	91108A250	0000
				1/4"	0.256"	0.478"	0.023" to 0.028"	—	ASME B18.21.1	5	91108A330	0000
				5/16"	0.320"	0.610"	0.028" to 0.034"	—	ASME B18.21.1	5	91108A360	0000
				3/8"	0.384"	0.692"	0.032" to 0.040"	—	ASME B18.21.1	5	91108A440	0000
				1/2"	0.530"	0.867"	0.037" to 0.045"	—	ASME B18.21.1	5	91108A111	0000


				Wear-Resistant 400 Series Stainless Steel



						No. 2	0.089"	0.200"	0.010" to 0.016"	—	ASME B18.21.1	100	98449A500	0000
						No. 2	0.095"	0.200"	0.010" to 0.016"	—	ASME B18.21.1	1,000	98449A003	00000
						No. 3	0.102"	0.232"	0.010" to 0.016"	—	ASME B18.21.1	100	98449A505	0000
						No. 4	0.115"	0.270"	0.012" to 0.018"	—	ASME B18.21.1	100	98449A510	0000
						No. 4	0.123"	0.270"	0.012" to 0.018"	—	ASME B18.21.1	1,000	98449A005	00000
						No. 5	0.136"	0.280"	0.014" to 0.020"	—	ASME B18.21.1	100	98449A515	0000
						No. 5	0.136"	0.280"	0.014" to 0.020"	—	ASME B18.21.1	1,000	98449A006	00000
No. 6						0.141"	0.295"	0.016" to 0.022"	—	ASME B18.21.1	100	98449A520	0000
No. 6	0.150"					0.295"	0.016" to 0.022"	—	ASME B18.21.1	1,000	98449A007	00000
No. 8	0.168"					0.340"	0.018" to 0.023"	—	ASME B18.21.1	100	98449A525	0000


No. 9	0.176"					0.340"	0.018" to 0.023"	—	ASME B18.21.1	1,000	98449A009	00000
No. 10	0.195"					0.381"	0.018" to 0.024"	—	ASME B18.21.1	100	98449A530	0000
No. 10	0.204"					0.381"	0.018" to 0.024"	—	ASME B18.21.1	1,000	98449A011	00000
No. 12	0.221"					0.410"	0.020" to 0.027"	—	ASME B18.21.1	100	98449A535	0000
1/4"	0.256"					0.478"	0.023" to 0.028"	—	ASME B18.21.1	100	98449A540	0000
1/4"	0.267"					0.478"	0.023" to 0.028"	—	ASME B18.21.1	1,000	98449A029	00000
5/16"	0.320"					0.610"	0.028" to 0.034"	—	ASME B18.21.1	100	98449A030	0000
3/8"	0.384"					0.692"	0.032" to 0.040"	—	ASME B18.21.1	100	98449A031	0000
7/16"	0.448"					0.789"	0.032" to 0.040"	—	ASME B18.21.1	100	98449A032	00000
1/2"	0.512"					0.900"	0.037" to 0.045"	—	ASME B18.21.1	50	98449A033	0000


9/16"	0.576"					0.985"	0.037" to 0.045"	—	ASME B18.21.1	50	98449A034	00000
5/8"	0.640"					1.071"	0.042" to 0.050"	—	ASME B18.21.1	25	98449A035	00000
3/4"	0.769"					1.245"	0.047" to 0.055"	—	ASME B18.21.1	25	98449A036	00000
7/8"	0.927"					1.410"	0.052" to 0.060"	—	ASME B18.21.1	5	98449A113	0000
1"	1.060"					1.640"	0.059" to 0.067"	—	ASME B18.21.1	5	98449A114	0000


Zinc-Plated Steel



						No. 2	0.089"	0.200"	0.010" to 0.016"	—	ASME B18.21.1	100	91113A003	0000
						No. 3	0.102"	0.232"	0.010" to 0.016"	—	ASME B18.21.1	100	91113A004	0000
						No. 4	0.115"	0.270"	0.012" to 0.018"	—	ASME B18.21.1	100	91113A005	0000
						No. 5	0.129"	0.280"	0.014" to 0.020"	—	ASME B18.21.1	100	91113A006	0000
						No. 6	0.141"	0.295"	0.016" to 0.022"	—	ASME B18.21.1	100	91113A007	0000
						No. 8	0.168"	0.340"	0.018" to 0.023"	—	ASME B18.21.1	100	91113A009	0000
						No. 10	0.195"	0.381"	0.018" to 0.024"	—	ASME B18.21.1	100	91113A011	0000
						No. 12	0.221"	0.410"	0.020" to 0.027"	—	ASME B18.21.1	100	91113A013	0000
						1/4"	0.256"	0.478"	0.023" to 0.028"	—	ASME B18.21.1	100	91113A029	0000
						1/4"	0.256"	0.536"	0.034" to 0.044"	SAE Grade 8	ASME B18.21.1	100	91150A110	00000


						5/16"	0.320"	0.607"	0.028" to 0.034"	—	ASME B18.21.1	50	91113A030	0000
		5/16"				0.320"	0.607"	0.040" to 0.050"	SAE Grade 8	ASME B18.21.1	50	91150A113	00000
		3/8"	0.384"			0.681"	0.032" to 0.040"	—	ASME B18.21.1	50	91113A031	0000
		3/8"	0.384"			0.747"	0.040" to 0.050"	SAE Grade 8	ASME B18.21.1	25	91150A114	00000
		7/16"	0.448"			0.764"	0.032" to 0.040"	—	ASME B18.21.1	50	91113A032	0000
		1/2"	0.512"			0.883"	0.037" to 0.045"	—	ASME B18.21.1	50	91113A033	0000
		1/2"	0.512"			0.923"	0.054" to 0.070"	SAE Grade 8	ASME B18.21.1	10	91150A120	00000
		9/16"	0.576"			0.985"	0.037" to 0.045"	—	ASME B18.21.1	50	91113A034	0000
		5/8"	0.640"			1.071"	0.042" to 0.050"	—	ASME B18.21.1	50	91113A035	00000
		5/8"	0.640"			1.134"	0.054" to 0.070"	SAE Grade 8	ASME B18.21.1	5	91150A126	00000


		3/4"	0.769"			1.245"	0.047" to 0.055"	—	ASME B18.21.1	25	91113A036	0000
		3/4"	0.769"			1.260"	0.073" to 0.083"	SAE Grade 8	ASME B18.21.1	5	91150A130	00000
		7/8"	0.894"			1.410"	0.052" to 0.060"	—	ASME B18.21.1	25	91113A037	00000
		1"	1.019"	1.613"		0.059" to 0.067"	—	ASME B18.21.1	10	91113A038	0000
		1 1/8"	1.144"	1.830"	0.059" to 0.067"	—	ASME B18.21.1	10	91113A039	00000
		1 1/4"	1.275"	1.975"	0.059" to 0.067"	—	ASME B18.21.1	5	91113A040	00000
		1 3/8"	1.394"	1.950"	0.060" to 0.064"	—	—	1	91113A051	0000
		1 1/2"	1.500"	2.515"	0.076" to 0.080"	—	—	1	91113A063	0000
		M2	2.2 mm	4.5 mm	0.2 mm to 0.4 mm	—	DIN 6797	100	93925A415	0000
		M2.5	2.7 mm	5.5 mm	0.2 mm to 0.5 mm	—	DIN 6797	100	93925A416	0000


		M3	3.2 mm	6.0 mm	0.3 mm to 0.5 mm	—	DIN 6797	100	93925A417	0000
		M3.5	3.7 mm	7.0 mm	0.4 mm to 0.6 mm	—	DIN 6797	100	93925A418	0000
		M4	4.3 mm	8.0 mm	0.4 mm to 0.6 mm	—	DIN 6797	100	93925A419	0000
		M5	5.3 mm	10.0 mm	0.5 mm to 0.7 mm	—	DIN 6797	100	93925A420	0000
		M6	6.4 mm	11.0 mm	0.6 mm to 0.8 mm	—	DIN 6797	100	93925A421	0000
		M7	7.4 mm	12.5 mm	0.7 mm to 0.9 mm	—	DIN 6797	100	93925A422	0000
		M8	8.4 mm	15.0 mm	0.7 mm to 0.9 mm	—	DIN 6797	100	93925A423	0000
		M10	10.5 mm	18.0 mm	0.8 mm to 1.0 mm	—	DIN 6797	50	93925A424	0000
		M12	13.0 mm	20.5 mm	0.9 mm to 1.2 mm	—	DIN 6797	50	93925A425	00000
		M14	15.0 mm	24.0 mm	0.9 mm to 1.2 mm	—	DIN 6797	25	93925A426	0000


		M16	17.0 mm	26.0 mm	1.0 mm to 1.4 mm	—	DIN 6797	25	93925A427	0000
		M18	19.0 mm	30.0 mm	1.2 mm to 1.5 mm	—	DIN 6797	10	93925A428	0000
		M20	21.0 mm	33.0 mm	1.2 mm to 1.5 mm	—	DIN 6797	10	93925A429	00000
		M24	25.0 mm	38.0 mm	1.3 mm to 1.6 mm	—	DIN 6797	10	93925A430	00000


		Black-Oxide Steel



				M2	2.2 mm	4.5 mm	0.2 mm to 0.4 mm	—	DIN 6797	100	91106A120	0000
				M2.5	2.7 mm	5.5 mm	0.2 mm to 0.5 mm	—	DIN 6797	100	91106A150	0000
				M2.6	2.8 mm	5.5 mm	0.3 mm to 0.5 mm	—	DIN 6797	100	91106A121	0000
M3				3.2 mm	6.0 mm	0.3 mm to 0.5 mm	—	DIN 6797	100	91106A122	0000
M3.5	3.7 mm			7.0 mm	0.4 mm to 0.6 mm	—	DIN 6797	100	91106A123	0000
M4	4.3 mm			8.0 mm	0.4 mm to 0.6 mm	—	DIN 6797	100	91106A124	0000
M5	5.3 mm			10.0 mm	0.5 mm to 0.7 mm	—	DIN 6797	100	91106A126	0000
M6	6.4 mm			11.0 mm	0.6 mm to 0.8 mm	—	DIN 6797	100	91106A128	0000
M8	8.4 mm			15.0 mm	0.7 mm to 0.9 mm	—	DIN 6797	100	91106A131	0000
M10	10.5 mm			18.0 mm	0.8 mm to 1.0 mm	—	DIN 6797	50	91106A133	0000


M12	13.0 mm			20.5 mm	0.9 mm to 1.2 mm	—	DIN 6797	50	91106A135	0000
M14	15.0 mm			24.0 mm	0.9 mm to 1.2 mm	—	DIN 6797	25	91106A137	0000
M16	17.0 mm			26.0 mm	1.0 mm to 1.4 mm	—	DIN 6797	25	91106A139	0000
M18	19.0 mm			30.0 mm	1.2 mm to 1.5 mm	—	DIN 6797	10	91106A142	0000
M20	21.0 mm			33.0 mm	1.2 mm to 1.5 mm	—	DIN 6797	10	91106A146	00000


Super-Corrosion-Resistant Phosphor Bronze



				No. 2	0.089"	0.200"	0.010" to 0.016"	—	ASME B18.21.1	100	92165A002	0000
				No. 3	0.109"	0.232"	0.010" to 0.016"	—	ASME B18.21.1	100	92165A121	0000
				No. 4	0.115"	0.270"	0.012" to 0.018"	—	ASME B18.21.1	100	92165A005	0000
				No. 5	0.136"	0.280"	0.014" to 0.018"	—	ASME B18.21.1	100	92165A122	0000
				No. 6	0.141"	0.295"	0.016" to 0.022"	—	ASME B18.21.1	100	92165A007	0000
				No. 8	0.168"	0.340"	0.018" to 0.023"	—	ASME B18.21.1	100	92165A009	0000
				No. 10	0.195"	0.381"	0.018" to 0.024"	—	ASME B18.21.1	100	92165A011	0000
				No. 12	0.231"	0.410"	0.020" to 0.027"	—	ASME B18.21.1	100	92165A123	0000
				1/4"	0.256"	0.478"	0.023" to 0.028"	—	ASME B18.21.1	100	92165A029	00000
				5/16"	0.320"	0.610"	0.028" to 0.034"	—	ASME B18.21.1	50	92165A030	0000


				3/8"	0.384"	0.692"	0.032" to 0.040"	—	ASME B18.21.1	50	92165A031	00000
				7/16"	0.448"	0.789"	0.032" to 0.040"	—	ASME B18.21.1	25	92165A032	0000
				1/2"	0.512"	0.900"	0.037" to 0.045"	—	ASME B18.21.1	25	92165A033	00000
				5/8"	0.640"	1.071"	0.042" to 0.050"	—	ASME B18.21.1	5	92165A055	0000
				3/4"	0.795"	1.245"	0.047" to 0.055"	—	ASME B18.21.1	5	92165A124	0000

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.

Wear-Resistant 410 Stainless Steel—These grip hard material better than other types of stainless steel. They are not as corrosion resistant as 18-8 and 316 stainless steel, so they are best for environments that experience occasional moisture.

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

	ID	OD	Thk.	Specs. Met	Pkg. Qty.		Pkg.
Wear-Resistant 410 Stainless Steel



	No. 4	0.115"	0.475"	0.016" to 0.021"	ASME B18.21.1	100	90588A111	00000
	No. 6	0.141"	0.510"	0.023" to 0.028"	ASME B18.21.1	100	90588A112	0000
	No. 8	0.168"	0.610"	0.028" to 0.034"	ASME B18.21.1	100	90588A113	0000
	No. 10	0.195"	0.610"	0.028" to 0.034"	ASME B18.21.1	100	90588A114	0000
	1/4"	0.256"	0.760"	0.032" to 0.040"	ASME B18.21.1	50	90588A115	0000
	5/16"	0.320"	0.900"	0.032" to 0.040"	ASME B18.21.1	50	90588A116	0000
	3/8"	0.384"	0.985"	0.037" to 0.045"	ASME B18.21.1	25	90588A117	0000
	1/2"	0.512"	1.260"	0.047" to 0.055"	ASME B18.21.1	10	90588A118	0000


	Zinc-Plated Steel



			No. 4	0.116"	0.478"	0.016" to 0.018"	ASME B18.21.1	50	95795A005	0000
			No. 6	0.142"	0.506"	0.023" to 0.027"	ASME B18.21.1	50	95795A006	0000
			No. 8	0.168"	0.506"	0.023" to 0.027"	ASME B18.21.1	100	95795A007	00000
			No. 10	0.195"	0.601"	0.027" to 0.031"	ASME B18.21.1	100	95795A012	00000
			1/4"	0.256"	0.760"	0.033" to 0.037"	ASME B18.21.1	100	95795A020	00000
			5/16"	0.320"	0.898"	0.033" to 0.037"	ASME B18.21.1	50	95795A024	00000
			3/8"	0.384"	0.985"	0.037" to 0.041"	ASME B18.21.1	50	95795A030	00000
			7/16"	0.448"	1.070"	0.043" to 0.047"	ASME B18.21.1	10	95795A032	0000
			1/2"	0.512"	1.260"	0.048" to 0.052"	ASME B18.21.1	25	95795A035	0000
			5/8"	0.640"	1.620"	0.060" to 0.064"	ASME B18.21.1	5	95795A053	00000


			M3	3.2 mm	12.0 mm	1.4 mm to 1.7 mm	—	50	95795A111	00000
			M4	4.3 mm	15.0 mm	1.9 mm to 2.3 mm	—	50	95795A112	00000
			M4	4.3 mm	18.0 mm	2.2 mm to 2.6 mm	—	25	95795A113	0000
			M5	5.3 mm	18.0 mm	2.2 mm to 2.6 mm	—	25	95795A114	00000
			M6	6.5 mm	18.0 mm	2.2 mm to 2.6 mm	—	25	95795A115	00000
			M8	8.5 mm	22.0 mm	2.7 mm to 3.3 mm	—	25	95795A116	00000
			M10	10.5 mm	26.0 mm	2.7 mm to 3.3 mm	—	10	95795A117	00000
			M12	12.5 mm	30.0 mm	3.2 mm to 4.0 mm	—	10	95795A118	00000
			M16	16.5 mm	35.0 mm	3.8 mm to 4.6 mm	—	5	95795A119	00000


			Black-Oxide Steel



					No. 6	0.142"	0.506"	0.023" to 0.027"	ASME B18.21.1	100	90416A111	0000
					No. 8	0.168"	0.506"	0.023" to 0.027"	ASME B18.21.1	100	90416A112	00000
					1/4"	0.256"	0.760"	0.033" to 0.037"	ASME B18.21.1	100	90416A114	00000
					5/16"	0.320"	0.898"	0.033" to 0.037"	ASME B18.21.1	50	90416A115	00000
					3/8"	0.384"	0.985"	0.037" to 0.041"	ASME B18.21.1	25	90416A116	00000
					7/16"	0.448"	1.070"	0.043" to 0.047"	ASME B18.21.1	25	90416A117	00000
					1/2"	0.512"	1.260"	0.048" to 0.052"	ASME B18.21.1	10	90416A118	0000

Mil. Spec. Tooth Lock Washers

These washers are manufactured and tested to strict U.S. military standards for material and construction. They resist vibration better 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

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

	ID	OD	Thk.	Mil. Spec.	Specs. Met	Pkg. Qty.		Pkg.
Wear-Resistant 410 Stainless Steel



	No. 4	0.115"	0.260"	0.015" to 0.019"	MS35335-57	ASME B18.21.1	25	97775A110	000000
	No. 6	0.141"	0.320"	0.016" to 0.022"	MS35335-58	ASME B18.21.1	25	97775A150	00000
	No. 8	0.168"	0.381"	0.018" to 0.023"	MS35335-59	ASME B18.21.1	25	97775A220	00000
	No. 10	0.195"	0.410"	0.020" to 0.025"	MS35335-60	ASME B18.21.1	25	97775A260	00000
	1/4"	0.256"	0.510"	0.023" to 0.028"	MS35335-61	ASME B18.21.1	25	97775A330	00000
	5/16"	0.320"	0.610"	0.028" to 0.034"	MS35335-62	ASME B18.21.1	25	97775A370	00000
	3/8"	0.384"	0.694"	0.032" to 0.040"	MS35335-63	ASME B18.21.1	25	97775A440	00000
	7/16"	0.448"	0.760"	0.032" to 0.040"	MS35335-64	ASME B18.21.1	25	97775A511	00000
	1/2"	0.513"	0.900"	0.037" to 0.045"	MS35335-65	ASME B18.21.1	10	97775A512	0000
	9/16"	0.576"	0.985"	0.037" to 0.045"	MS35335-66	ASME B18.21.1	10	97775A513	0000


	5/8"	0.641"	1.070"	0.042" to 0.050"	MS35335-67	ASME B18.21.1	5	97775A514	0000
	3/4"	0.768"	1.260"	0.047" to 0.055"	MS35335-68	ASME B18.21.1	5	97775A515	0000
	7/8"	0.897"	1.410"	0.052" to 0.060"	MS35335-69	ASME B18.21.1	1	97775A516	0000
	1"	1.025"	1.620"	0.059" to 0.067"	MS35335-70	ASME B18.21.1	1	97775A517	0000


	Zinc-Plated Steel



			No. 4	0.115"	0.260"	0.015" to 0.019"	MS35335-29	ASME B18.21.1	100	97775A518	0000
			No. 6	0.141"	0.320"	0.016" to 0.022"	MS35335-30	ASME B18.21.1	100	97775A519	00000
			No. 8	0.168"	0.381"	0.018" to 0.023"	MS35335-31	ASME B18.21.1	100	97775A520	00000
			No. 10	0.195"	0.410"	0.020" to 0.025"	MS35335-32	ASME B18.21.1	100	97775A521	00000
			1/4"	0.256"	0.510"	0.023" to 0.028"	MS35335-33	ASME B18.21.1	100	97775A522	00000
			5/16"	0.320"	0.610"	0.028" to 0.034"	MS35335-34	ASME B18.21.1	50	97775A523	00000
			3/8"	0.384"	0.694"	0.032" to 0.040"	MS35335-35	ASME B18.21.1	50	97775A524	00000
			7/16"	0.448"	0.760"	0.032" to 0.040"	MS35335-36	ASME B18.21.1	25	97775A525	00000
			1/2"	0.513"	0.900"	0.037" to 0.045"	MS35335-37	ASME B18.21.1	25	97775A526	00000
			9/16"	0.576"	0.985"	0.037" to 0.045"	MS35335-38	ASME B18.21.1	25	97775A527	00000


			5/8"	0.641"	1.070"	0.042" to 0.050"	MS35335-39	ASME B18.21.1	10	97775A528	0000
			3/4"	0.768"	1.260"	0.047" to 0.055"	MS35335-40	ASME B18.21.1	10	97775A529	0000
			7/8"	0.897"	1.410"	0.052" to 0.060"	MS35335-41	ASME B18.21.1	10	97775A530	0000
			1"	1.025"	1.620"	0.059" to 0.067"	MS35335-42	ASME B18.21.1	5	97775A531	0000


			Super-Corrosion-Resistant Phosphor Bronze



					No. 10	0.195"	0.410"	0.020" to 0.025"	MS35335-88	ASME B18.21.1	25	97775A534	0000
					1/4"	0.256"	0.510"	0.023" to 0.028"	MS35335-89	ASME B18.21.1	10	97775A535	0000
					5/16"	0.320"	0.610"	0.028" to 0.034"	MS35335-90	ASME B18.21.1	10	97775A536	0000
					3/8"	0.384"	0.694"	0.032" to 0.040"	MS35335-91	ASME B18.21.1	10	97775A537	0000
					1/2"	0.513"	0.900"	0.037" to 0.045"	MS35335-93	ASME B18.21.1	10	97775A538	0000

Internal Tooth

Corrosion-Resistant Cadmium-Plated Steel—The finish creates a better barrier against rust than zinc plating for use in wet and outdoor environments.

	ID	OD	Thk.	Mil. Spec.	Specs. Met	Pkg. Qty.		Pkg.
Wear-Resistant 410 Stainless Steel



	No. 2	0.089"	0.200"	0.010" to 0.015"	MS35333-69	ASME B18.21.1, NASM35333	25	96551A110	00000
	No. 4	0.115"	0.270"	0.015" to 0.019"	MS35333-70	ASME B18.21.1, NASM35333	25	96551A550	00000
	No. 6	0.141"	0.295"	0.017" to 0.021"	MS35333-71	ASME B18.21.1, NASM35333	25	96551A610	00000
	No. 8	0.168"	0.340"	0.018" to 0.023"	MS35333-72	ASME B18.21.1, NASM35333	25	96551A670	00000
	No. 10	0.195"	0.381"	0.020" to 0.025"	MS35333-73	ASME B18.21.1, NASM35333	25	96551A770	00000
	1/4"	0.256"	0.478"	0.023" to 0.028"	MS35333-74	ASME B18.21.1, NASM35333	25	96551A790	00000
	5/16"	0.332"	0.610"	0.028" to 0.034"	MS35333-75	ASME B18.21.1, NASM35333	25	96551A120	0000
	3/8"	0.384"	0.692"	0.032" to 0.040"	MS35333-76	ASME B18.21.1, NASM35333	25	96551A130	00000
	7/16"	0.448"	0.789"	0.032" to 0.040"	MS35333-77	ASME B18.21.1, NASM35333	25	96551A140	00000
	1/2"	0.512"	0.900"	0.037" to 0.045"	MS35333-78	ASME B18.21.1, NASM35333	10	96551A150	00000


	5/8"	0.640"	1.071"	0.042" to 0.050"	MS35333-80	ASME B18.21.1, NASM35333	10	96551A160	00000
	3/4"	0.769"	1.245"	0.047" to 0.055"	MS35333-81	ASME B18.21.1, NASM35333	5	96551A170	00000
	7/8"	0.894"	1.410"	0.052" to 0.060"	MS35333-82	ASME B18.21.1, NASM35333	5	96551A180	00000


	Corrosion-Resistant Cadmium-Plated Steel



			No. 2	0.089"	0.200"	0.010" to 0.015"	MS35333-35	ASME B18.21.1, NASM35333	25	96551A190	0000
			No. 4	0.115"	0.270"	0.015" to 0.019"	MS35333-36	ASME B18.21.1, NASM35333	25	96551A200	0000
			No. 6	0.141"	0.295"	0.017" to 0.021"	MS35333-37	ASME B18.21.1, NASM35333	25	96551A210	0000
			No. 8	0.168"	0.340"	0.018" to 0.023"	MS35333-38	ASME B18.21.1, NASM35333	25	96551A220	0000
			No. 10	0.195"	0.381"	0.020" to 0.025"	MS35333-39	ASME B18.21.1, NASM35333	25	96551A230	0000
			1/4"	0.256"	0.478"	0.023" to 0.028"	MS35333-40	ASME B18.21.1, NASM35333	25	96551A240	0000
			5/16"	0.332"	0.610"	0.028" to 0.034"	MS35333-41	ASME B18.21.1, NASM35333	25	96551A250	0000
			3/8"	0.384"	0.692"	0.032" to 0.040"	MS35333-42	ASME B18.21.1, NASM35333	25	96551A260	00000
			7/16"	0.448"	0.789"	0.032" to 0.040"	MS35333-43	ASME B18.21.1, NASM35333	25	96551A270	00000
			1/2"	0.512"	0.900"	0.037" to 0.045"	MS35333-44	ASME B18.21.1, NASM35333	25	96551A280	00000


			5/8"	0.640"	1.071"	0.042" to 0.050"	MS35333-46	ASME B18.21.1, NASM35333	10	96551A290	0000
			3/4"	0.769"	1.245"	0.047" to 0.055"	MS35333-47	ASME B18.21.1, NASM35333	10	96551A300	0000
			7/8"	0.894"	1.410"	0.052" to 0.060"	MS35333-48	ASME B18.21.1, NASM35333	10	96551A310	00000
			1"	1.019"	1.637"	0.059" to 0.067"	MS35333-49	ASME B18.21.1, NASM35333	5	96551A320	0000
			1 1/4"	1.260"	1.950"	0.059" to 0.067"	MS35333-51	ASME B18.21.1, NASM35333	5	96551A330	0000


			Super-Corrosion-Resistant Phosphor Bronze



					No. 2	0.089"	0.200"	0.010" to 0.015"	MS35333-103	ASME B18.21.1, NASM35333	25	96551A340	0000
					No. 4	0.115"	0.270"	0.015" to 0.019"	MS35333-104	ASME B18.21.1, NASM35333	25	96551A350	0000
					No. 6	0.141"	0.295"	0.017" to 0.021"	MS35333-105	ASME B18.21.1, NASM35333	25	96551A360	00000
					No. 8	0.168"	0.340"	0.018" to 0.023"	MS35333-106	ASME B18.21.1, NASM35333	25	96551A370	00000
					No. 10	0.195"	0.381"	0.020" to 0.025"	MS35333-107	ASME B18.21.1, NASM35333	25	96551A380	00000
					1/4"	0.256"	0.478"	0.023" to 0.028"	MS35333-108	ASME B18.21.1, NASM35333	25	96551A390	00000
					5/16"	0.332"	0.610"	0.028" to 0.034"	MS35333-109	ASME B18.21.1, NASM35333	10	96551A400	0000
					3/8"	0.384"	0.692"	0.032" to 0.040"	MS35333-110	ASME B18.21.1, NASM35333	10	96551A410	0000
					1/2"	0.512"	0.900"	0.037" to 0.045"	MS35333-113	ASME B18.21.1, NASM35333	5	96551A420	0000

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	OD	Thk.	Countersink Angle	Specs. Met	Pkg. Qty.		Pkg.
Wear-Resistant 400 Series Stainless Steel



	No. 6	0.140"	0.289"	0.017" to 0.021"	82°	ASME B18.21.1	100	90900A007	00000
	No. 8	0.167"	0.322"	0.017" to 0.021"	82°	ASME B18.21.1	100	90900A009	0000
	No. 10	0.195"	0.354"	0.020" to 0.025"	82°	ASME B18.21.1	25	90900A012	0000
	No. 12	0.220"	0.421"	0.020" to 0.025"	82°	ASME B18.21.1	50	90900A111	0000
	1/4"	0.255"	0.454"	0.020" to 0.025"	82°	ASME B18.21.1	25	90900A030	0000
	5/16"	0.318"	0.599"	0.023" to 0.028"	82°	ASME B18.21.1	25	90900A112	0000


	Zinc-Plated Steel



			No. 4	0.113"	0.213"	0.015" to 0.019"	82°	ASME B18.21.1	50	90069A103	00000
			No. 6	0.140"	0.289"	0.017" to 0.021"	82°	ASME B18.21.1	100	90069A105	00000
			No. 8	0.167"	0.322"	0.017" to 0.021"	82°	ASME B18.21.1	100	90069A110	00000
			No. 10	0.195"	0.354"	0.020" to 0.025"	82°	ASME B18.21.1	50	90069A115	00000
			No. 12	0.220"	0.421"	0.020" to 0.025"	82°	ASME B18.21.1	100	90069A120	00000
			1/4"	0.255"	0.458"	0.022"	82°	ASME B18.21.1	100	90069A126	00000
			5/16"	0.318"	0.599"	0.023" to 0.028"	82°	ASME B18.21.1	100	90069A130	00000
			3/8"	0.383"	0.765"	0.028" to 0.034"	82°	ASME B18.21.1	25	90069A136	00000
			1/2"	0.512"	0.976"	0.037" to 0.045"	82°	ASME B18.21.1	10	90069A137	0000
			M3	3.2 mm	6.0 mm	0.2 mm to 0.3 mm	90°	DIN 6798	100	4340N111	00000


			M4	4.3 mm	8.0 mm	0.2 mm to 0.3 mm	90°	DIN 6798	100	4340N112	00000
			M5	5.3 mm	9.8 mm	0.3 mm to 0.4 mm	90°	DIN 6798	50	4340N113	00000
			M6	6.4 mm	11.8 mm	0.4 mm to 0.5 mm	90°	DIN 6798	50	4340N114	0000
			M8	8.4 mm	15.3 mm	0.4 mm to 0.5 mm	90°	DIN 6798	50	4340N115	00000
			M10	10.5 mm	19.0 mm	0.5 mm to 0.6 mm	90°	DIN 6798	25	4340N116	0000
			M12	13.0 mm	23.0 mm	0.5 mm to 0.6 mm	90°	DIN 6798	25	4340N117	00000


			Black-Oxide Steel



					No. 4	0.113"	0.213"	0.015" to 0.019"	82°	ASME B18.21.1	25	90069A211	0000
					No. 6	0.140"	0.289"	0.017" to 0.021"	82°	ASME B18.21.1	25	90069A212	00000
					No. 8	0.167"	0.322"	0.017" to 0.021"	82°	ASME B18.21.1	25	90069A213	0000
					No. 10	0.195"	0.354"	0.020" to 0.025"	82°	ASME B18.21.1	25	90069A214	0000
					No. 12	0.220"	0.421"	0.020" to 0.025"	82°	ASME B18.21.1	25	90069A215	0000
					1/4"	0.255"	0.454"	0.020" to 0.025"	82°	ASME B18.21.1	25	90069A216	0000
					5/16"	0.318"	0.599"	0.023" to 0.028"	82°	ASME B18.21.1	25	90069A217	0000
					3/8"	0.383"	0.765"	0.028" to 0.034"	82°	ASME B18.21.1	25	90069A218	0000
					1/2"	0.512"	0.976"	0.037" to 0.045"	82°	ASME B18.21.1	10	90069A219	00000

Tab Lock Washers

2 Tabs

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.

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

2 Tabs—Also known as pantleg washers, these have two tabs for a more secure hold than washers with one tab. Bend one tab up against the flats of your nut or screw and the other tab down over the edge of your mounting surface.

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



	No. 10	0.204"	0.625"	0.036"	2	—	1	7508N11	00000
	1/4"	0.281"	0.75"	0.036"	2	—	1	7508N13	0000
	5/16"	0.343"	0.75"	0.036"	2	—	1	7508N14	0000
	3/8"	0.406"	0.875"	0.062"	2	—	1	7508N15	0000
	7/16"	0.500"	1.125"	0.062"	2	—	1	7508N16	0000
	1/2"	0.531"	1.125"	0.062"	2	—	1	7508N17	0000
	9/16"	0.595"	1.125"	0.062"	2	—	1	7508N18	0000
	5/8"	0.656"	1.25"	0.062"	2	—	1	7508N19	00000
	3/4"	0.781"	1.5"	0.062"	2	—	1	7508N21	00000
	7/8"	0.910"	1.75"	0.062"	2	—	1	7508N22	00000


	1"	1.031"	2"	0.094"	2	—	1	7508N23	00000
	1 1/4"	1.281"	2.5"	0.125"	2	—	1	7508N24	00000
	1 1/2"	1.531"	3"	0.125"	2	—	1	7508N25	00000
	M4	4.3 mm	14.0 mm	0.4 mm	1	DIN 93	100	97471A141	00000
	M5	5.3 mm	17.0 mm	0.5 mm	1	DIN 93	50	97471A142	00000
	M6	6.4 mm	19.0 mm	0.5 mm	1	DIN 93	50	97471A143	00000
	M8	8.4 mm	22.0 mm	0.8 mm	1	DIN 93	25	97471A144	00000
	M10	10.5 mm	26.0 mm	0.8 mm	1	DIN 93	25	97471A145	00000
	M12	13.0 mm	30.0 mm	1.0 mm	1	DIN 93	10	97471A146	0000


	Zinc-Plated Steel



			No. 10	0.204"	0.625"	0.036"	2	—	1	2741N17	0000
			1/4"	0.281"	0.75"	0.036"	2	—	1	2741N11	0000
			5/16"	0.343"	0.75"	0.036"	2	—	1	2741N12	0000
			3/8"	0.406"	0.875"	0.063"	2	—	1	2741N13	0000
			7/16"	0.500"	1.125"	0.062"	2	—	1	2741N19	0000
			1/2"	0.531"	1.125"	0.063"	2	—	1	2741N14	0000
			9/16"	0.595"	1.125"	0.062"	2	—	1	2741N21	0000
			5/8"	0.656"	1.25"	0.062"	2	—	1	2741N15	0000
			3/4"	0.781"	1.5"	0.063"	2	—	1	2741N16	0000
			7/8"	0.910"	1.75"	0.062"	2	—	1	2741N22	0000


			1"	1.031"	2"	0.094"	2	—	1	2741N23	0000
			1 1/4"	1.281"	2.5"	0.125"	2	—	1	2741N24	0000
			1 1/2"	1.531"	3"	0.125"	2	—	1	2741N25	0000

Domed Tooth Lock Washers

Limit damage to your material while ensuring nuts and screws stay tight. These washers have a slight dome that flattens under pressure, distributing pressure over a wide surface area and eliminating stress points. They also have smooth tabs on the outside edge that add friction for a tight grip, without digging into your mounting surface the way a sharp tooth would. Tooth lock washers prevent fasteners from loosening in applications with constant movement, such as conveyors. They typically can't be reused because the teeth often get bent when tightened.

Internal Tooth

Internal teeth dig into the nut or screw to prevent it from backing out. They grip best on fasteners with small diameters, such as fillister and cheese head screws.

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

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



	No. 6	0.146"	0.569"	0.023" to 0.027"	10	97527A001	00000
	No. 8	0.168"	0.569"	0.023" to 0.027"	10	97527A003	00000
	No. 10	0.195"	0.569"	0.027" to 0.031"	10	97527A005	00000
	1/4"	0.256"	0.698"	0.048" to 0.052"	5	97527A007	00000
	5/16"	0.320"	0.885"	0.060" to 0.064"	5	97527A009	00000
	3/8"	0.384"	1.010"	0.060" to 0.064"	5	97527A011	00000

Tooth Lock Washer Assortments

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

Keep a collection of tooth lock washers on hand to work with a range of screw sizes. The teeth bite into material to prevent fasteners from loosening in applications with constant movement, such as conveyors. External-tooth lock washers grip tighter than internal-tooth lock washers, however, they may mar your material and snag on objects. Tooth lock washers typically can't be reused because the teeth often get bent when tightened.

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

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

	Sizes Included	Container Type		Each
Zinc-Plated Steel



	1,335	635 External Tooth Lock Washers (For No. 4 to 1/2" Screw Sizes) 700 Internal Tooth Lock Washers (For No. 2 to 3/8" Screw Sizes)	Plastic Box	98651A192	000000