Mil. Spec. Tooth Lock Washers

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70 Products

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

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.

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.

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.

	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	000000000	000000


	No. 6	0.141"	0.320"	0.016" to 0.022"	MS35335-58	ASME B18.21.1	25	000000000	00000
	No. 8	0.168"	0.381"	0.018" to 0.023"	MS35335-59	ASME B18.21.1	25	000000000	00000
	No. 10	0.195"	0.410"	0.020" to 0.025"	MS35335-60	ASME B18.21.1	25	000000000	00000
	1/4"	0.256"	0.510"	0.023" to 0.028"	MS35335-61	ASME B18.21.1	25	000000000	00000
	5/16"	0.320"	0.610"	0.028" to 0.034"	MS35335-62	ASME B18.21.1	25	000000000	00000
	3/8"	0.384"	0.694"	0.032" to 0.040"	MS35335-63	ASME B18.21.1	25	000000000	00000
	7/16"	0.448"	0.760"	0.032" to 0.040"	MS35335-64	ASME B18.21.1	25	000000000	00000
	1/2"	0.513"	0.900"	0.037" to 0.045"	MS35335-65	ASME B18.21.1	10	000000000	0000
	9/16"	0.576"	0.985"	0.037" to 0.045"	MS35335-66	ASME B18.21.1	10	000000000	0000
	5/8"	0.641"	1.070"	0.042" to 0.050"	MS35335-67	ASME B18.21.1	5	000000000	0000


	3/4"	0.768"	1.260"	0.047" to 0.055"	MS35335-68	ASME B18.21.1	5	000000000	0000
	7/8"	0.897"	1.410"	0.052" to 0.060"	MS35335-69	ASME B18.21.1	1	000000000	0000
	1"	1.025"	1.620"	0.059" to 0.067"	MS35335-70	ASME B18.21.1	1	000000000	0000


	Zinc-Plated Steel



			No. 4	0.115"	0.260"	0.015" to 0.019"	MS35335-29	ASME B18.21.1	100	000000000	0000


			No. 6	0.141"	0.320"	0.016" to 0.022"	MS35335-30	ASME B18.21.1	100	000000000	00000
			No. 8	0.168"	0.381"	0.018" to 0.023"	MS35335-31	ASME B18.21.1	100	000000000	00000
			No. 10	0.195"	0.410"	0.020" to 0.025"	MS35335-32	ASME B18.21.1	100	000000000	00000
			1/4"	0.256"	0.510"	0.023" to 0.028"	MS35335-33	ASME B18.21.1	100	000000000	00000
			5/16"	0.320"	0.610"	0.028" to 0.034"	MS35335-34	ASME B18.21.1	50	000000000	00000
			3/8"	0.384"	0.694"	0.032" to 0.040"	MS35335-35	ASME B18.21.1	50	000000000	00000
			7/16"	0.448"	0.760"	0.032" to 0.040"	MS35335-36	ASME B18.21.1	25	000000000	00000
			1/2"	0.513"	0.900"	0.037" to 0.045"	MS35335-37	ASME B18.21.1	25	000000000	00000
			9/16"	0.576"	0.985"	0.037" to 0.045"	MS35335-38	ASME B18.21.1	25	000000000	00000
			5/8"	0.641"	1.070"	0.042" to 0.050"	MS35335-39	ASME B18.21.1	10	000000000	0000


			3/4"	0.768"	1.260"	0.047" to 0.055"	MS35335-40	ASME B18.21.1	10	000000000	0000
			7/8"	0.897"	1.410"	0.052" to 0.060"	MS35335-41	ASME B18.21.1	10	000000000	0000
			1"	1.025"	1.620"	0.059" to 0.067"	MS35335-42	ASME B18.21.1	5	000000000	0000


			Highly-Corrosion-Resistant Phosphor Bronze



					No. 10	0.195"	0.410"	0.020" to 0.025"	MS35335-88	ASME B18.21.1	25	000000000	0000


					1/4"	0.256"	0.510"	0.023" to 0.028"	MS35335-89	ASME B18.21.1	10	000000000	0000
					5/16"	0.320"	0.610"	0.028" to 0.034"	MS35335-90	ASME B18.21.1	10	000000000	0000
					3/8"	0.384"	0.694"	0.032" to 0.040"	MS35335-91	ASME B18.21.1	10	000000000	0000
					1/2"	0.513"	0.900"	0.037" to 0.045"	MS35335-93	ASME B18.21.1	10	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.

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	000000000	00000


	No. 4	0.115"	0.270"	0.015" to 0.019"	MS35333-70	ASME B18.21.1, NASM35333	25	000000000	00000
	No. 6	0.141"	0.295"	0.017" to 0.021"	MS35333-71	ASME B18.21.1, NASM35333	25	000000000	00000
	No. 8	0.168"	0.340"	0.018" to 0.023"	MS35333-72	ASME B18.21.1, NASM35333	25	000000000	00000
	No. 10	0.195"	0.381"	0.020" to 0.025"	MS35333-73	ASME B18.21.1, NASM35333	25	000000000	00000
	1/4"	0.256"	0.478"	0.023" to 0.028"	MS35333-74	ASME B18.21.1, NASM35333	25	000000000	00000
	5/16"	0.332"	0.610"	0.028" to 0.034"	MS35333-75	ASME B18.21.1, NASM35333	25	000000000	0000
	3/8"	0.384"	0.692"	0.032" to 0.040"	MS35333-76	ASME B18.21.1, NASM35333	25	000000000	00000
	7/16"	0.448"	0.789"	0.032" to 0.040"	MS35333-77	ASME B18.21.1, NASM35333	25	000000000	00000
	1/2"	0.512"	0.900"	0.037" to 0.045"	MS35333-78	ASME B18.21.1, NASM35333	10	000000000	00000
	5/8"	0.640"	1.071"	0.042" to 0.050"	MS35333-80	ASME B18.21.1, NASM35333	10	000000000	00000


	3/4"	0.769"	1.245"	0.047" to 0.055"	MS35333-81	ASME B18.21.1, NASM35333	5	000000000	00000
	7/8"	0.894"	1.410"	0.052" to 0.060"	MS35333-82	ASME B18.21.1, NASM35333	5	000000000	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	000000000	0000


			No. 4	0.115"	0.270"	0.015" to 0.019"	MS35333-36	ASME B18.21.1, NASM35333	25	000000000	0000
			No. 6	0.141"	0.295"	0.017" to 0.021"	MS35333-37	ASME B18.21.1, NASM35333	25	000000000	0000
			No. 8	0.168"	0.340"	0.018" to 0.023"	MS35333-38	ASME B18.21.1, NASM35333	25	000000000	0000
			No. 10	0.195"	0.381"	0.020" to 0.025"	MS35333-39	ASME B18.21.1, NASM35333	25	000000000	0000
			1/4"	0.256"	0.478"	0.023" to 0.028"	MS35333-40	ASME B18.21.1, NASM35333	25	000000000	0000
			5/16"	0.332"	0.610"	0.028" to 0.034"	MS35333-41	ASME B18.21.1, NASM35333	25	000000000	0000
			3/8"	0.384"	0.692"	0.032" to 0.040"	MS35333-42	ASME B18.21.1, NASM35333	25	000000000	00000
			7/16"	0.448"	0.789"	0.032" to 0.040"	MS35333-43	ASME B18.21.1, NASM35333	25	000000000	00000
			1/2"	0.512"	0.900"	0.037" to 0.045"	MS35333-44	ASME B18.21.1, NASM35333	25	000000000	00000
			5/8"	0.640"	1.071"	0.042" to 0.050"	MS35333-46	ASME B18.21.1, NASM35333	10	000000000	0000


			3/4"	0.769"	1.245"	0.047" to 0.055"	MS35333-47	ASME B18.21.1, NASM35333	10	000000000	0000
			7/8"	0.894"	1.410"	0.052" to 0.060"	MS35333-48	ASME B18.21.1, NASM35333	10	000000000	00000
			1"	1.019"	1.637"	0.059" to 0.067"	MS35333-49	ASME B18.21.1, NASM35333	5	000000000	0000
			1 1/4"	1.260"	1.950"	0.059" to 0.067"	MS35333-51	ASME B18.21.1, NASM35333	5	000000000	0000


			Highly-Corrosion-Resistant Phosphor Bronze



					No. 2	0.089"	0.200"	0.010" to 0.015"	MS35333-103	ASME B18.21.1, NASM35333	25	000000000	0000


					No. 4	0.115"	0.270"	0.015" to 0.019"	MS35333-104	ASME B18.21.1, NASM35333	25	000000000	0000
					No. 6	0.141"	0.295"	0.017" to 0.021"	MS35333-105	ASME B18.21.1, NASM35333	25	000000000	00000
					No. 8	0.168"	0.340"	0.018" to 0.023"	MS35333-106	ASME B18.21.1, NASM35333	25	000000000	00000
					No. 10	0.195"	0.381"	0.020" to 0.025"	MS35333-107	ASME B18.21.1, NASM35333	25	000000000	00000
					1/4"	0.256"	0.478"	0.023" to 0.028"	MS35333-108	ASME B18.21.1, NASM35333	25	000000000	00000
					5/16"	0.332"	0.610"	0.028" to 0.034"	MS35333-109	ASME B18.21.1, NASM35333	10	000000000	0000
					3/8"	0.384"	0.692"	0.032" to 0.040"	MS35333-110	ASME B18.21.1, NASM35333	10	000000000	0000
					1/2"	0.512"	0.900"	0.037" to 0.045"	MS35333-113	ASME B18.21.1, NASM35333	5	000000000	0000