Mil. Spec. Tooth Lock Washers

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Tooth

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Mil. Spec.

Military Specification

NASM35333

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Rockwell C40 to Rockwell C50

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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	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


			Highly 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

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, 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