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)
    95 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.
    Super-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.
    Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.
    For Screw
    Size
    ID,
    mm
    OD,
    mm
    Thk., mm
    Specs.
    Met
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    M2
    		2.34.50.2 to 0.4DIN 679710000000000000000
    M2.5
    		2.85.50.3 to 0.5DIN 67971000000000000000
    M3
    		3.26.00.3 to 0.5DIN 67971000000000000000
    M3.5
    		3.97.00.4 to 0.6DIN 67971000000000000000
    M4
    		4.38.00.4 to 0.6DIN 67971000000000000000
    M5
    		5.310.00.5 to 0.7DIN 67971000000000000000
    M6
    		6.411.00.6 to 0.8DIN 67971000000000000000
    M7
    		7.412.50.7 to 0.9DIN 67971000000000000000
    M8
    		8.415.00.7 to 0.9DIN 67971000000000000000
    M10
    		10.518.00.8 to 1.0DIN 67971000000000000000
    M12
    		13.020.50.9 to 1.2DIN 6797500000000000000
    M14
    		15.024.00.9 to 1.2DIN 6797500000000000000
    M16
    		17.326.01.0 to 1.4DIN 67975000000000000000
    M18
    		19.030.01.2 to 1.6DIN 6797100000000000000
    M20
    		21.033.01.2 to 1.6DIN 6797100000000000000
    M22
    		23.036.01.3 to 1.7DIN 6797100000000000000
    M24
    		25.038.01.3 to 1.7DIN 67971000000000000000
    M30
    		31.048.01.4 to 1.8DIN 67971000000000000000
     
    Super-Corrosion-Resistant 316 Stainless Steel
    M3
    		3.26.00.3 to 0.5DIN 679750000000000000
    M4
    		4.38.00.4 to 0.6DIN 679750000000000000
    M5
    		5.310.00.5 to 0.7DIN 679750000000000000
    M6
    		6.411.00.6 to 0.8DIN 679750000000000000
    M8
    		8.415.00.7 to 0.9DIN 6797500000000000000
    M10
    		10.518.00.8 to 1.0DIN 679710000000000000
    M12
    		13.020.50.9 to 1.2DIN 6797100000000000000
    M14
    		15.024.00.9 to 1.2DIN 6797100000000000000
    M16
    		17.326.01.0 to 1.4DIN 6797100000000000000
    M20
    		21.033.01.2 to 1.6DIN 6797100000000000000
     
    Zinc-Plated Steel
    M2
    		2.34.50.2 to 0.4DIN 67971000000000000000
    M2.5
    		2.85.50.3 to 0.5DIN 67971000000000000000
    M3
    		3.26.00.3 to 0.5DIN 67971000000000000000
    M3.5
    		3.97.00.9 to 1.2DIN 67971000000000000000
    M4
    		4.38.00.4 to 0.6DIN 67971000000000000000
    M5
    		5.310.00.5 to 0.7DIN 67971000000000000000
    M6
    		6.411.00.6 to 0.8DIN 67971000000000000000
    M7
    		7.412.50.7 to 0.9DIN 6797250000000000000
    M8
    		8.415.00.7 to 0.9DIN 67971000000000000000
    M10
    		10.518.00.8 to 1.0DIN 6797500000000000000
    M12
    		13.020.50.9 to 1.2DIN 6797250000000000000
    M14
    		15.024.00.9 to 1.2DIN 6797250000000000000
    M16
    		17.326.01.0 to 1.4DIN 6797250000000000000
    M18
    		19.030.01.2 to 1.6DIN 679750000000000000
    M20
    		21.033.01.2 to 1.6DIN 679750000000000000
    M22
    		23.036.01.3 to 1.7DIN 679750000000000000
    M24
    		25.038.01.3 to 1.7DIN 679750000000000000
    M30
    		31.048.01.4 to 1.8DIN 679750000000000000
     
    Internal Tooth
    Image of Product. Front orientation. Lock Washers. Tooth Washer, 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.
    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.
    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 679710000000000000000
    M2.3
    		2.55.00.2 to 0.4DIN 67971000000000000000
    M2.5
    		2.75.50.2 to 0.5DIN 67971000000000000000
    M3
    		3.26.00.3 to 0.5DIN 67971000000000000000
    M3.5
    		3.77.00.4 to 0.6DIN 67971000000000000000
    M4
    		4.38.00.4 to 0.6DIN 67971000000000000000
    M5
    		5.310.00.5 to 0.7DIN 67971000000000000000
    M6
    		6.411.00.6 to 0.8DIN 67971000000000000000
    M7
    		7.412.50.7 to 0.9DIN 67975000000000000000
    M8
    		8.415.00.7 to 0.9DIN 67971000000000000000
    M10
    		10.518.00.8 to 1.0DIN 6797500000000000000
    M12
    		13.020.50.9 to 1.2DIN 6797500000000000000
    M14
    		15.024.00.9 to 1.2DIN 6797250000000000000
    M16
    		17.026.01.0 to 1.4DIN 6797250000000000000
    M18
    		19.030.01.2 to 1.5DIN 6797100000000000000
    M20
    		21.033.01.2 to 1.5DIN 6797100000000000000
    M22
    		23.036.01.3 to 1.6DIN 6797100000000000000
    M24
    		25.038.01.3 to 1.6DIN 67971000000000000000
     
    Zinc-Plated Steel
    M2
    		2.24.50.2 to 0.4DIN 67971000000000000000
    M2.5
    		2.75.50.2 to 0.5DIN 67971000000000000000
    M3
    		3.26.00.3 to 0.5DIN 67971000000000000000
    M3.5
    		3.77.00.4 to 0.6DIN 67971000000000000000
    M4
    		4.38.00.4 to 0.6DIN 67971000000000000000
    M5
    		5.310.00.5 to 0.7DIN 67971000000000000000
    M6
    		6.411.00.6 to 0.8DIN 67971000000000000000
    M7
    		7.412.50.7 to 0.9DIN 67971000000000000000
    M8
    		8.415.00.7 to 0.9DIN 67971000000000000000
    M10
    		10.518.00.8 to 1.0DIN 6797500000000000000
    M12
    		13.020.50.9 to 1.2DIN 67975000000000000000
    M14
    		15.024.00.9 to 1.2DIN 6797250000000000000
    M16
    		17.026.01.0 to 1.4DIN 6797250000000000000
    M18
    		19.030.01.2 to 1.5DIN 6797100000000000000
    M20
    		21.033.01.2 to 1.5DIN 67971000000000000000
    M24
    		25.038.01.3 to 1.6DIN 67971000000000000000
     
    Black-Oxide Steel
    M2
    		2.24.50.2 to 0.4DIN 67971000000000000000
    M2.5
    		2.75.50.2 to 0.5DIN 67971000000000000000
    M2.6
    		2.85.50.3 to 0.5DIN 67971000000000000000
    M3
    		3.26.00.3 to 0.5DIN 67971000000000000000
    M3.5
    		3.77.00.4 to 0.6DIN 67971000000000000000
    M4
    		4.38.00.4 to 0.6DIN 67971000000000000000
    M5
    		5.310.00.5 to 0.7DIN 67971000000000000000
    M6
    		6.411.00.6 to 0.8DIN 67971000000000000000
    M8
    		8.415.00.7 to 0.9DIN 67971000000000000000
    M10
    		10.518.00.8 to 1.0DIN 6797500000000000000
    M12
    		13.020.50.9 to 1.2DIN 6797500000000000000
    M14
    		15.024.00.9 to 1.2DIN 6797250000000000000
    M16
    		17.026.01.0 to 1.4DIN 6797250000000000000
    M18
    		19.030.01.2 to 1.5DIN 6797100000000000000
    M20
    		21.033.01.2 to 1.5DIN 67971000000000000000
     
    back to top