McMaster-Carr logo
    Forward
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Print
    How can we improve?
    Comments
    E-mail address (if you would like a response)
    26 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
    Image of Product. Front orientation. Lock Washers. Tooth Washer, 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.
    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.
    For Screw
    Size
    ID,
    mm
    OD,
    mm
    Thk., mm
    Specs.
    Met
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    M2
    		2.24.50.2 to 0.4DIN 679810091120A31100000
    M2.5
    		2.75.50.3 to 0.5DIN 679810091120A3120000
    M3
    		3.26.00.3 to 0.5DIN 679810091120A1200000
    M4
    		4.38.00.4 to 0.6DIN 679810091120A1300000
    M5
    		5.310.00.5 to 0.7DIN 679810091120A1400000
    M6
    		6.411.00.6 to 0.8DIN 679810091120A1600000
    M8
    		8.415.00.7 to 0.9DIN 679810091120A1800000
    M10
    		10.518.00.8 to 1.0DIN 679810091120A20000000
    M12
    		13.020.50.9 to 1.2DIN 67985091120A2110000
    M16
    		17.026.01.0 to 1.4DIN 67985091120A2350000
    M20
    		21.033.01.2 to 1.5DIN 67981091120A2410000
    M24
    		25.038.01.4 to 1.6DIN 67981091120A2450000
     
    Zinc-Plated Steel
    M3
    		3.26.00.4 to 0.5DIN 679810097985A7200000
    M4
    		4.38.00.5 to 0.6DIN 679810097985A7300000
    M5
    		5.310.00.6 to 0.7DIN 679810097985A7400000
    M6
    		6.411.00.7 to 0.8DIN 679810097985A7600000
    M8
    		8.415.00.8 to 0.9DIN 679810097985A7800000
    M10
    		10.518.00.9 to 1.0DIN 67985097985A8000000
    M12
    		13.020.51.0 to 1.2DIN 67985097985A8100000
     

    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
    Image of Product. Front orientation. Lock Washers. Countersunk Washer, Tooth Washer, 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.
    For Screw
    Size
    ID,
    mm
    OD,
    mm
    Thk., mm
    Countersink
    Angle
    Specs.
    Met
    Pkg.
    Qty.
    Pkg.
    Zinc-Plated Steel
    M3
    		3.26.00.2 to 0.390°
    		DIN 67981004340N111000000
    M4
    		4.38.00.2 to 0.390°
    		DIN 67981004340N11200000
    M5
    		5.39.80.3 to 0.490°
    		DIN 6798504340N11300000
    M6
    		6.411.80.4 to 0.590°
    		DIN 6798504340N1140000
    M8
    		8.415.30.4 to 0.590°
    		DIN 6798504340N11500000
    M10
    		10.519.00.5 to 0.690°
    		DIN 6798254340N1160000
    M12
    		13.023.00.5 to 0.690°
    		DIN 6798254340N11700000
     
    back to top