ASME B18.21.1 Countersunk External Tooth Lock Washers

ASME B18.21.1 Countersunk External Tooth Lock Washers

Dimensions of ASME B18.21.1 Countersunk External Tooth Lock Washers

Nominal Washers Size Inside Diameter, A Outside Diameter, B, Reference Thickness, C Length, D
Max Min Max Min Max Min
4 0.123 0.113 0.213 0.019 0.015 0.065 0.050
6 0.150 0.140 0.289 0.021 0.017 0.092 0.082
8 0.177 0.167 0.322 0.021 0.017 0.099 0.083
10 0.205 0.195 0.354 0.025 0.020 0.105 0.088
12 0.231 0.220 0.421 0.025 0.020 0.128 0.118
1/4 0.267 0.255 0.454 0.025 0.020 0.128 0.113
16 0.287 0.273 0.505 0.028 0.023 0.147 0.137
5/16 0.333 0.318 0.599 0.028 0.023 0.192 0.165
3/8 0.398 0.383 0.765 0.034 0.028 0.255 0.242
7/16 0.463 0.448 0.867 0.045 0.037 0.270 0.260
1/2 0.529 0.512 0.976 0.045 0.037 0.304 0.294

Notes : Dimensions are in inches.

  • Suggested angle or mating components is 80-82 deg.
  • Washers size are intended for use with comparable nominal screw sizes.
  • For reference purposes only; not subject to inspection.