Countersunk External Tooth Lock Washers

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Washer Type

Thickness

Tooth Location

Material

400 Series Stainless Steel

Finish

Countersink Angle

Specifications Met

Performance

RoHS

REACH

Hardness

DFARS Specialty Metals

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Export Control Classification Number (ECCN)

EAR99

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31 Products

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.

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.

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	000000000	00000


	No. 8	0.167"	0.322"	0.017" to 0.021"	82°	ASME B18.21.1	100	000000000	0000
	No. 10	0.195"	0.354"	0.020" to 0.025"	82°	ASME B18.21.1	25	000000000	0000
	No. 12	0.220"	0.421"	0.020" to 0.025"	82°	ASME B18.21.1	50	000000000	0000
	1/4"	0.255"	0.454"	0.020" to 0.025"	82°	ASME B18.21.1	25	000000000	0000
	5/16"	0.318"	0.599"	0.023" to 0.028"	82°	ASME B18.21.1	25	000000000	0000


	Zinc-Plated Steel



			No. 4	0.113"	0.213"	0.015" to 0.019"	82°	ASME B18.21.1	50	000000000	00000


			No. 6	0.140"	0.289"	0.017" to 0.021"	82°	ASME B18.21.1	100	000000000	00000
			No. 8	0.167"	0.322"	0.017" to 0.021"	82°	ASME B18.21.1	100	000000000	00000
			No. 10	0.195"	0.354"	0.020" to 0.025"	82°	ASME B18.21.1	50	000000000	00000
			No. 12	0.220"	0.421"	0.020" to 0.025"	82°	ASME B18.21.1	100	000000000	00000
			1/4"	0.255"	0.458"	0.022"	82°	ASME B18.21.1	100	000000000	00000
			5/16"	0.318"	0.599"	0.023" to 0.028"	82°	ASME B18.21.1	100	000000000	00000
			3/8"	0.383"	0.765"	0.028" to 0.034"	82°	ASME B18.21.1	25	000000000	00000
			1/2"	0.512"	0.976"	0.037" to 0.045"	82°	ASME B18.21.1	10	000000000	0000
			M3	3.2 mm	6.0 mm	0.2 mm to 0.3 mm	90°	DIN 6798	100	00000000	00000
			M4	4.3 mm	8.0 mm	0.2 mm to 0.3 mm	90°	DIN 6798	100	00000000	00000


			M5	5.3 mm	9.8 mm	0.3 mm to 0.4 mm	90°	DIN 6798	50	00000000	00000
			M6	6.4 mm	11.8 mm	0.4 mm to 0.5 mm	90°	DIN 6798	50	00000000	0000
			M8	8.4 mm	15.3 mm	0.4 mm to 0.5 mm	90°	DIN 6798	50	00000000	00000
			M10	10.5 mm	19.0 mm	0.5 mm to 0.6 mm	90°	DIN 6798	25	00000000	0000
			M12	13.0 mm	23.0 mm	0.5 mm to 0.6 mm	90°	DIN 6798	25	00000000	00000


			Black-Oxide Steel



					No. 4	0.113"	0.213"	0.015" to 0.019"	82°	ASME B18.21.1	25	000000000	0000


					No. 6	0.140"	0.289"	0.017" to 0.021"	82°	ASME B18.21.1	25	000000000	00000
					No. 8	0.167"	0.322"	0.017" to 0.021"	82°	ASME B18.21.1	25	000000000	0000
					No. 10	0.195"	0.354"	0.020" to 0.025"	82°	ASME B18.21.1	25	000000000	0000
					No. 12	0.220"	0.421"	0.020" to 0.025"	82°	ASME B18.21.1	25	000000000	0000
					1/4"	0.255"	0.454"	0.020" to 0.025"	82°	ASME B18.21.1	25	000000000	0000
					5/16"	0.318"	0.599"	0.023" to 0.028"	82°	ASME B18.21.1	25	000000000	0000
					3/8"	0.383"	0.765"	0.028" to 0.034"	82°	ASME B18.21.1	25	000000000	0000
					1/2"	0.512"	0.976"	0.037" to 0.045"	82°	ASME B18.21.1	10	000000000	00000