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    188 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.
    Black-Oxide 18-8 Stainless Steel—Typically chosen for their appearance, these washers have a dark, matte coating to create a finished look. They won't rust in wet and outdoor environments, but can't hold up to harsh chemicals as well as 316 stainless steel.
    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.
    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.
    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
    OD
    Thk.
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    No. 2
    0.086"0.189"0.010" to 0.013"ASME B18.21.110095584A31100000
    No. 4
    0.115"0.260"0.012" to 0.018"ASME B18.21.110095584A2000000
    No. 6
    0.141"0.320"0.016" to 0.022"ASME B18.21.110095584A2010000
    No. 8
    0.168"0.381"0.018" to 0.023"ASME B18.21.110095584A2030000
    No. 10
    0.195"0.410"0.018" to 0.024"ASME B18.21.110095584A2050000
    No. 12
    0.221"0.475"0.020" to 0.027"ASME B18.21.110095584A5110000
    1/4"
    0.256"0.510"0.023" to 0.028"ASME B18.21.110095584A2070000
    5/16"
    0.320"0.610"0.028" to 0.034"ASME B18.21.15095584A2090000
    3/8"
    0.384"0.694"0.032" to 0.040"ASME B18.21.12595584A2110000
    1/2"
    0.513"0.900"0.037" to 0.045"ASME B18.21.15095584A5120000
    5/8"
    0.641"1.070"0.042" to 0.050"ASME B18.21.11095584A3120000
    3/4"
    0.768"1.260"0.047" to 0.055"ASME B18.21.1595584A3130000
    M2
    2.2 mm4.5 mm0.2 mm to 0.4 mmDIN 679810091120A3110000
    M2
    2.3 mm4.5 mm0.2 mm to 0.4 mmDIN 679710095060A5100000
    M2.5
    2.7 mm5.5 mm0.3 mm to 0.5 mmDIN 679810091120A3120000
    M2.5
    2.8 mm5.5 mm0.3 mm to 0.5 mmDIN 679710095060A5200000
    M3
    3.2 mm6.0 mm0.3 mm to 0.5 mmDIN 679710095060A3200000
    M3
    3.2 mm6.0 mm0.3 mm to 0.5 mmDIN 679810091120A1200000
    M3.5
    3.9 mm7.0 mm0.4 mm to 0.6 mmDIN 679710095060A5300000
    M4
    4.3 mm8.0 mm0.4 mm to 0.6 mmDIN 679710095060A3300000
    M4
    4.3 mm8.0 mm0.4 mm to 0.6 mmDIN 679810091120A1300000
    M5
    5.3 mm10.0 mm0.5 mm to 0.7 mmDIN 679710095060A3500000
    M5
    5.3 mm10.0 mm0.5 mm to 0.7 mmDIN 679810091120A1400000
    M6
    6.4 mm11.0 mm0.6 mm to 0.8 mmDIN 679710095060A3600000
    M6
    6.4 mm11.0 mm0.6 mm to 0.8 mmDIN 679810091120A1600000
    M7
    7.4 mm12.5 mm0.7 mm to 0.9 mmDIN 679710095060A4600000
    M8
    8.4 mm15.0 mm0.7 mm to 0.9 mmDIN 679710095060A3900000
    M8
    8.4 mm15.0 mm0.7 mm to 0.9 mmDIN 679810091120A1800000
    M10
    10.5 mm18.0 mm0.8 mm to 1.0 mmDIN 679710095060A4000000
    M10
    10.5 mm18.0 mm0.8 mm to 1.0 mmDIN 679810091120A20000000
    M12
    13.0 mm20.5 mm0.9 mm to 1.2 mmDIN 67975095060A4110000
    M12
    13.0 mm20.5 mm0.9 mm to 1.2 mmDIN 67985091120A2110000
    M14
    15.0 mm24.0 mm0.9 mm to 1.2 mmDIN 67975095060A4200000
    M16
    17.0 mm26.0 mm1.0 mm to 1.4 mmDIN 67985091120A2350000
    M16
    17.3 mm26.0 mm1.0 mm to 1.4 mmDIN 67975095060A54000000
    M18
    19.0 mm30.0 mm1.2 mm to 1.6 mmDIN 67971095060A4400000
    M20
    21.0 mm33.0 mm1.2 mm to 1.5 mmDIN 67981091120A2410000
    M20
    21.0 mm33.0 mm1.2 mm to 1.6 mmDIN 67971095060A4500000
    M22
    23.0 mm36.0 mm1.3 mm to 1.7 mmDIN 67971095060A4700000
    M24
    25.0 mm38.0 mm1.3 mm to 1.7 mmDIN 67971095060A48000000
    M24
    25.0 mm38.0 mm1.4 mm to 1.6 mmDIN 67981091120A2450000
    M30
    31.0 mm48.0 mm1.4 mm to 1.8 mmDIN 67971095060A50000000
     
    Black-Oxide 18-8 Stainless Steel
    No. 6
    0.141"0.320"0.016" to 0.022"ASME B18.21.110095584A3140000
    No. 8
    0.168"0.381"0.018" to 0.023"ASME B18.21.110095584A3150000
    No. 10
    0.195"0.410"0.018" to 0.024"ASME B18.21.110095584A3160000
    1/4"
    0.256"0.510"0.023" to 0.028"ASME B18.21.110095584A3170000
    5/16"
    0.320"0.610"0.028" to 0.034"ASME B18.21.110095584A3180000
    3/8"
    0.384"0.694"0.032" to 0.040"ASME B18.21.110095584A31900000
     
    Super-Corrosion-Resistant 316 Stainless Steel
    No. 4
    0.115"0.260"0.012" to 0.018"ASME B18.21.11090375A0050000
    No. 6
    0.141"0.320"0.016" to 0.022"ASME B18.21.11090375A0070000
    No. 8
    0.168"0.381"0.018" to 0.023"ASME B18.21.11090375A0090000
    No. 10
    0.195"0.410"0.018" to 0.024"ASME B18.21.11090375A0110000
    1/4"
    0.256"0.510"0.023" to 0.028"ASME B18.21.12590375A1100000
    5/16"
    0.320"0.610"0.028" to 0.034"ASME B18.21.12590375A1200000
    3/8"
    0.384"0.694"0.032" to 0.040"ASME B18.21.11090375A1300000
    1/2"
    0.513"0.900"0.037" to 0.045"ASME B18.21.11090375A1400000
    M3
    3.2 mm6.0 mm0.3 mm to 0.5 mmDIN 6797590412A1100000
    M4
    4.3 mm8.0 mm0.4 mm to 0.6 mmDIN 6797590412A1200000
    M5
    5.3 mm10.0 mm0.5 mm to 0.7 mmDIN 6797590412A1300000
    M6
    6.4 mm11.0 mm0.6 mm to 0.8 mmDIN 6797590412A1400000
    M8
    8.4 mm15.0 mm0.7 mm to 0.9 mmDIN 6797590412A1500000
    M10
    10.5 mm18.0 mm0.8 mm to 1.0 mmDIN 6797190412A1600000
    M12
    13.0 mm20.5 mm0.9 mm to 1.2 mmDIN 6797190412A1700000
    M14
    15.0 mm24.0 mm0.9 mm to 1.2 mmDIN 6797190412A1800000
    M16
    17.3 mm26.0 mm1.0 mm to 1.4 mmDIN 6797190412A1900000
    M20
    21.0 mm33.0 mm1.2 mm to 1.6 mmDIN 6797190412A2000000
     
    Wear-Resistant 400 Series Stainless Steel
    No. 2
    0.096"0.195"0.010" to 0.016"10098438A2000000
    No. 3
    0.102"0.235"0.010" to 0.016"ASME B18.21.110098438A2050000
    No. 4
    0.115"0.260"0.012" to 0.018"ASME B18.21.110098438A2100000
    No. 5
    0.129"0.285"0.014" to 0.020"ASME B18.21.110098438A2150000
    No. 6
    0.141"0.320"0.016" to 0.022"ASME B18.21.110098438A2200000
    No. 8
    0.168"0.381"0.018" to 0.023"ASME B18.21.110098438A2250000
    No. 10
    0.195"0.410"0.018" to 0.024"ASME B18.21.110098438A2300000
    No. 12
    0.221"0.475"0.020" to 0.027"ASME B18.21.110098438A2350000
    1/4"
    0.256"0.510"0.023" to 0.028"ASME B18.21.110098438A2400000
    5/16"
    0.320"0.610"0.028" to 0.034"ASME B18.21.110098438A0300000
    3/8"
    0.384"0.694"0.032" to 0.040"ASME B18.21.15098438A0310000
    7/16"
    0.448"0.760"0.032" to 0.040"ASME B18.21.15098438A0320000
    1/2"
    0.513"0.900"0.037" to 0.045"ASME B18.21.12598438A0330000
    9/16"
    0.576"0.985"0.037" to 0.045"ASME B18.21.12593419A1110000
    5/8"
    0.641"1.070"0.042" to 0.050"ASME B18.21.12598438A0350000
    3/4"
    0.768"1.260"0.047" to 0.055"ASME B18.21.12598438A03600000
    7/8"
    0.897"1.410"0.052" to 0.060"ASME B18.21.1593419A1120000
    1"
    1.025"1.620"0.059" to 0.067"ASME B18.21.1593419A1130000
     
    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.
    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.
    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.
    For Screw
    Size
    ID
    OD
    Thk.
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    No. 4
    0.115"0.270"0.012" to 0.018"ASME B18.21.110091757A10100000
    No. 6
    0.141"0.295"0.016" to 0.022"ASME B18.21.110091757A1030000
    No. 8
    0.168"0.340"0.018" to 0.023"ASME B18.21.110091757A1050000
    No. 10
    0.195"0.381"0.018" to 0.024"ASME B18.21.110091757A1070000
    No. 12
    0.231"0.410"0.020" to 0.027"ASME B18.21.110091757A1320000
    1/4"
    0.256"0.478"0.023" to 0.028"ASME B18.21.110091757A1090000
    5/16"
    0.320"0.610"0.028" to 0.034"ASME B18.21.15091757A1110000
    3/8"
    0.384"0.692"0.032" to 0.040"ASME B18.21.12591757A1130000
    1/2"
    0.512"0.900"0.037" to 0.045"ASME B18.21.11091757A1170000
    9/16"
    0.576"0.985"0.037" to 0.045"ASME B18.21.11091757A1220000
    5/8"
    0.640"1.071"0.042" to 0.050"ASME B18.21.11091757A1280000
    3/4"
    0.769"1.245"0.047" to 0.055"ASME B18.21.1591757A1310000
    M2
    2.2 mm4.5 mm0.2 mm to 0.4 mmDIN 679710093925A2100000
    M2.3
    2.5 mm5.0 mm0.2 mm to 0.4 mmDIN 679710093925A4110000
    M2.5
    2.7 mm5.5 mm0.2 mm to 0.5 mmDIN 679710093925A2200000
    M3
    3.2 mm6.0 mm0.3 mm to 0.5 mmDIN 679710093925A2400000
    M3.5
    3.7 mm7.0 mm0.4 mm to 0.6 mmDIN 679710093925A2210000
    M4
    4.3 mm8.0 mm0.4 mm to 0.6 mmDIN 679710093925A2500000
    M5
    5.3 mm10.0 mm0.5 mm to 0.7 mmDIN 679710093925A2600000
    M6
    6.4 mm11.0 mm0.6 mm to 0.8 mmDIN 679710093925A2700000
    M7
    7.4 mm12.5 mm0.7 mm to 0.9 mmDIN 67975093925A41200000
    M8
    8.4 mm15.0 mm0.7 mm to 0.9 mmDIN 679710093925A2800000
    M10
    10.5 mm18.0 mm0.8 mm to 1.0 mmDIN 67975093925A2900000
    M12
    13.0 mm20.5 mm0.9 mm to 1.2 mmDIN 67975093925A3000000
    M14
    15.0 mm24.0 mm0.9 mm to 1.2 mmDIN 67972593925A3100000
    M16
    17.0 mm26.0 mm1.0 mm to 1.4 mmDIN 67972593925A3200000
    M18
    19.0 mm30.0 mm1.2 mm to 1.5 mmDIN 67971093925A3300000
    M20
    21.0 mm33.0 mm1.2 mm to 1.5 mmDIN 67971093925A3400000
    M22
    23.0 mm36.0 mm1.3 mm to 1.6 mmDIN 67971093925A4130000
    M24
    25.0 mm38.0 mm1.3 mm to 1.6 mmDIN 67971093925A41400000
     
    Super-Corrosion-Resistant 316 Stainless Steel
    No. 4
    0.115"0.270"0.012" to 0.018"ASME B18.21.1591108A1100000
    No. 6
    0.141"0.295"0.016" to 0.022"ASME B18.21.1591108A1400000
    No. 8
    0.168"0.340"0.018" to 0.023"ASME B18.21.1591108A2200000
    No. 10
    0.195"0.381"0.018" to 0.024"ASME B18.21.1591108A2500000
    1/4"
    0.256"0.478"0.023" to 0.028"ASME B18.21.1591108A3300000
    5/16"
    0.320"0.610"0.028" to 0.034"ASME B18.21.1591108A3600000
    3/8"
    0.384"0.692"0.032" to 0.040"ASME B18.21.1591108A4400000
    1/2"
    0.530"0.867"0.037" to 0.045"ASME B18.21.1591108A1110000
     
    Wear-Resistant 400 Series Stainless Steel
    No. 2
    0.089"0.200"0.010" to 0.016"ASME B18.21.110098449A5000000
    No. 2
    0.095"0.200"0.010" to 0.016"ASME B18.21.11,00098449A00300000
    No. 3
    0.102"0.232"0.010" to 0.016"ASME B18.21.110098449A5050000
    No. 4
    0.115"0.270"0.012" to 0.018"ASME B18.21.110098449A5100000
    No. 4
    0.123"0.270"0.012" to 0.018"ASME B18.21.11,00098449A00500000
    No. 5
    0.136"0.280"0.014" to 0.020"ASME B18.21.110098449A5150000
    No. 5
    0.136"0.280"0.014" to 0.020"ASME B18.21.11,00098449A00600000
    No. 6
    0.141"0.295"0.016" to 0.022"ASME B18.21.110098449A5200000
    No. 6
    0.150"0.295"0.016" to 0.022"ASME B18.21.11,00098449A00700000
    No. 8
    0.168"0.340"0.018" to 0.023"ASME B18.21.110098449A5250000
    No. 9
    0.176"0.340"0.018" to 0.023"ASME B18.21.11,00098449A00900000
    No. 10
    0.195"0.381"0.018" to 0.024"ASME B18.21.110098449A5300000
    No. 10
    0.204"0.381"0.018" to 0.024"ASME B18.21.11,00098449A01100000
    No. 12
    0.221"0.410"0.020" to 0.027"ASME B18.21.110098449A5350000
    1/4"
    0.256"0.478"0.023" to 0.028"ASME B18.21.110098449A5400000
    1/4"
    0.267"0.478"0.023" to 0.028"ASME B18.21.11,00098449A02900000
    5/16"
    0.320"0.610"0.028" to 0.034"ASME B18.21.110098449A0300000
    3/8"
    0.384"0.692"0.032" to 0.040"ASME B18.21.110098449A0310000
    7/16"
    0.448"0.789"0.032" to 0.040"ASME B18.21.110098449A03200000
    1/2"
    0.512"0.900"0.037" to 0.045"ASME B18.21.15098449A0330000
    9/16"
    0.576"0.985"0.037" to 0.045"ASME B18.21.15098449A03400000
    5/8"
    0.640"1.071"0.042" to 0.050"ASME B18.21.12598449A03500000
    3/4"
    0.769"1.245"0.047" to 0.055"ASME B18.21.12598449A03600000
    7/8"
    0.927"1.410"0.052" to 0.060"ASME B18.21.1598449A1130000
    1"
    1.060"1.640"0.059" to 0.067"ASME B18.21.1598449A1140000
     
    Internal and External Tooth
    Image of Product. Front orientation. Lock Washers. Tooth Washer, Internal and External Tooth.
    The strongest hold of all our tooth lock washers, these combine internal and external teeth to boost gripping power. However, the teeth may mar your material and snag on objects. Pair these washers with fasteners that are large enough to make contact with the external 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.
    For Screw
    Size
    ID
    OD
    Thk.
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Wear-Resistant 410 Stainless Steel
    No. 4
    0.115"0.475"0.016" to 0.021"ASME B18.21.110090588A11100000
    No. 6
    0.141"0.510"0.023" to 0.028"ASME B18.21.110090588A1120000
    No. 8
    0.168"0.610"0.028" to 0.034"ASME B18.21.110090588A1130000
    No. 10
    0.195"0.610"0.028" to 0.034"ASME B18.21.110090588A1140000
    1/4"
    0.256"0.760"0.032" to 0.040"ASME B18.21.15090588A1150000
    5/16"
    0.320"0.900"0.032" to 0.040"ASME B18.21.15090588A1160000
    3/8"
    0.384"0.985"0.037" to 0.045"ASME B18.21.12590588A1170000
    1/2"
    0.512"1.260"0.047" to 0.055"ASME B18.21.11090588A1180000
     

    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
    Image of Product. Bottom orientation. Lock Washers. Tooth Washer, Mil. Spec., 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.
    For Screw
    Size
    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"MS35335-57ASME B18.21.12597775A110000000
    No. 6
    0.141"0.320"0.016" to 0.022"MS35335-58ASME B18.21.12597775A15000000
    No. 8
    0.168"0.381"0.018" to 0.023"MS35335-59ASME B18.21.12597775A22000000
    No. 10
    0.195"0.410"0.020" to 0.025"MS35335-60ASME B18.21.12597775A26000000
    1/4"
    0.256"0.510"0.023" to 0.028"MS35335-61ASME B18.21.12597775A33000000
    5/16"
    0.320"0.610"0.028" to 0.034"MS35335-62ASME B18.21.12597775A37000000
    3/8"
    0.384"0.694"0.032" to 0.040"MS35335-63ASME B18.21.12597775A44000000
    7/16"
    0.448"0.760"0.032" to 0.040"MS35335-64ASME B18.21.12597775A51100000
    1/2"
    0.513"0.900"0.037" to 0.045"MS35335-65ASME B18.21.11097775A5120000
    9/16"
    0.576"0.985"0.037" to 0.045"MS35335-66ASME B18.21.11097775A5130000
    5/8"
    0.641"1.070"0.042" to 0.050"MS35335-67ASME B18.21.1597775A5140000
    3/4"
    0.768"1.260"0.047" to 0.055"MS35335-68ASME B18.21.1597775A5150000
    7/8"
    0.897"1.410"0.052" to 0.060"MS35335-69ASME B18.21.1197775A5160000
    1"
    1.025"1.620"0.059" to 0.067"MS35335-70ASME B18.21.1197775A5170000
     
    Internal Tooth
    Image of Product. Front orientation. Lock Washers. Tooth Washer, Mil. Spec., 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.
    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.
    For Screw
    Size
    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"MS35333-69ASME B18.21.1, NASM353332596551A11000000
    No. 4
    0.115"0.270"0.015" to 0.019"MS35333-70ASME B18.21.1, NASM353332596551A55000000
    No. 6
    0.141"0.295"0.017" to 0.021"MS35333-71ASME B18.21.1, NASM353332596551A61000000
    No. 8
    0.168"0.340"0.018" to 0.023"MS35333-72ASME B18.21.1, NASM353332596551A67000000
    No. 10
    0.195"0.381"0.020" to 0.025"MS35333-73ASME B18.21.1, NASM353332596551A77000000
    1/4"
    0.256"0.478"0.023" to 0.028"MS35333-74ASME B18.21.1, NASM353332596551A79000000
    5/16"
    0.332"0.610"0.028" to 0.034"MS35333-75ASME B18.21.1, NASM353332596551A1200000
    3/8"
    0.384"0.692"0.032" to 0.040"MS35333-76ASME B18.21.1, NASM353332596551A13000000
    7/16"
    0.448"0.789"0.032" to 0.040"MS35333-77ASME B18.21.1, NASM353332596551A14000000
    1/2"
    0.512"0.900"0.037" to 0.045"MS35333-78ASME B18.21.1, NASM353331096551A15000000
    5/8"
    0.640"1.071"0.042" to 0.050"MS35333-80ASME B18.21.1, NASM353331096551A16000000
    3/4"
    0.769"1.245"0.047" to 0.055"MS35333-81ASME B18.21.1, NASM35333596551A17000000
    7/8"
    0.894"1.410"0.052" to 0.060"MS35333-82ASME B18.21.1, NASM35333596551A18000000
     

    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. 
    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.
    For Screw
    Size
    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 B18.21.110090900A00700000
    No. 8
    0.167"0.322"0.017" to 0.021"82°
    ASME B18.21.110090900A0090000
    No. 10
    0.195"0.354"0.020" to 0.025"82°
    ASME B18.21.12590900A0120000
    No. 12
    0.220"0.421"0.020" to 0.025"82°
    ASME B18.21.15090900A1110000
    1/4"
    0.255"0.454"0.020" to 0.025"82°
    ASME B18.21.12590900A0300000
    5/16"
    0.318"0.599"0.023" to 0.028"82°
    ASME B18.21.12590900A1120000
     
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