Internal-Tooth Lock Washers

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Rockwell C40 to Rockwell C50

Rockwell C42

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SAE Grade 8

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NASM35333

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215 Products

Washer Type

Domed

Spread pressure over a large area to limit damage to material

6 products

Performance

Corrosion Resistant

Won't rust in wet and outdoor environments

123 products

Performance

High Strength

Withstand heavy loads and high stress without deforming

6 products

Wear Resistant

Won't lose strength, even on rotating parts with lots of friction

46 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.

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.

18-8 Stainless Steel—The choice for wet and outdoor environments, these washers won't rust when exposed to moisture. However, they can't hold up to the harsh chemicals that 316 stainless steel can.

Highly Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these washers won't degrade when exposed to harsh weather, salt water, and most chemicals.

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.

Highly 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.

	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	00000
		M24	25.0 mm	38.0 mm	1.3 mm to 1.6 mm	—	DIN 6797	10	93925A414	00000


		Highly 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	00000
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	00000
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	00000


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	91113A041	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	91113A042	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"	—	ASME B18.21.1	1	91113A051	0000
		1 1/2"	1.500"	2.515"	0.076" to 0.080"	—	ASME B18.21.1	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


Highly 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	00000


			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	00000
			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	00000
			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.

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, NASM35333	ASME B18.21.1	25	96551A110	00000


	No. 4	0.115"	0.270"	0.015" to 0.019"	MS35333-70, NASM35333	ASME B18.21.1	25	96551A550	00000
	No. 6	0.141"	0.295"	0.017" to 0.021"	MS35333-71, NASM35333	ASME B18.21.1	25	96551A610	00000
	No. 8	0.168"	0.340"	0.018" to 0.023"	MS35333-72, NASM35333	ASME B18.21.1	25	96551A670	00000
	No. 10	0.195"	0.381"	0.020" to 0.025"	MS35333-73, NASM35333	ASME B18.21.1	25	96551A770	00000
	1/4"	0.256"	0.478"	0.023" to 0.028"	MS35333-74, NASM35333	ASME B18.21.1	25	96551A790	00000
	5/16"	0.332"	0.610"	0.028" to 0.034"	MS35333-75, NASM35333	ASME B18.21.1	25	96551A120	0000
	3/8"	0.384"	0.692"	0.032" to 0.040"	MS35333-76, NASM35333	ASME B18.21.1	25	96551A130	00000
	7/16"	0.448"	0.789"	0.032" to 0.040"	MS35333-77, NASM35333	ASME B18.21.1	25	96551A140	00000
	1/2"	0.512"	0.900"	0.037" to 0.045"	MS35333-78, NASM35333	ASME B18.21.1	10	96551A150	00000
	5/8"	0.640"	1.071"	0.042" to 0.050"	MS35333-80, NASM35333	ASME B18.21.1	10	96551A160	00000


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


	Corrosion-Resistant Cadmium-Plated Steel



			No. 2	0.089"	0.200"	0.010" to 0.015"	MS35333-35, NASM35333	ASME B18.21.1	25	96551A190	0000


			No. 4	0.115"	0.270"	0.015" to 0.019"	MS35333-36, NASM35333	ASME B18.21.1	25	96551A200	0000
			No. 6	0.141"	0.295"	0.017" to 0.021"	MS35333-37, NASM35333	ASME B18.21.1	25	96551A210	0000
			No. 8	0.168"	0.340"	0.018" to 0.023"	MS35333-38, NASM35333	ASME B18.21.1	25	96551A220	0000
			No. 10	0.195"	0.381"	0.020" to 0.025"	MS35333-39, NASM35333	ASME B18.21.1	25	96551A230	0000
			1/4"	0.256"	0.478"	0.023" to 0.028"	MS35333-40, NASM35333	ASME B18.21.1	25	96551A240	0000
			5/16"	0.332"	0.610"	0.028" to 0.034"	MS35333-41, NASM35333	ASME B18.21.1	25	96551A250	0000
			3/8"	0.384"	0.692"	0.032" to 0.040"	MS35333-42, NASM35333	ASME B18.21.1	25	96551A260	00000
			7/16"	0.448"	0.789"	0.032" to 0.040"	MS35333-43, NASM35333	ASME B18.21.1	25	96551A270	00000
			1/2"	0.512"	0.900"	0.037" to 0.045"	MS35333-44, NASM35333	ASME B18.21.1	25	96551A280	00000
			5/8"	0.640"	1.071"	0.042" to 0.050"	MS35333-46, NASM35333	ASME B18.21.1	10	96551A290	0000


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


			Highly Corrosion-Resistant Phosphor Bronze



					No. 2	0.089"	0.200"	0.010" to 0.015"	MS35333-103, NASM35333	ASME B18.21.1	25	96551A340	0000


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