EXTERNAL TOOTH LOCK WASHERS DIMENSIONS CHART

External tooth lock washers dimensions chart for washer Type A and Type B according to ASME B18.21.1 standard.

External Tooth Lock Washer Dimensions
Nominal Size
(Nominal Thread dia., d)		 Inside Dia. A Outside Dia. B Thickness, C
max. min. max. min. max. min.
No.3 (0.099) 0.109 0.102 0.235 0.220 0.016 0.010
No.4  (0.112) 0.123 0.115 0.260 0.245 0.018 0.012
No.5 (0.125) 0.136 0.129 0.285 0.270 0.020 0.014
No.6 (0.138) 0.150 0.141 0.320 0.305 0.022 0.016
No.8 (0.164) 0.176 0.168 0.381 0.365 0.023 0.018
No.10 (0.190) 0.204 0.195 0.410 0.395 0.024 0.018
No.12 (0.216) 0.231 0.221 0.475 0.460 0.027 0.020
1/4 (0.250) 0.267 0.256 0.510 0.494 0.028 0.023
5/16 (0.3125) 0.332 0.320 0.610 0.588 0.034 0.028
3/8 (0.375) 0.398 0.384 0.694 0.670 0.040 0.032
7/16 (0.4375) 0.464 0.448 0.760 0.740 0.040 0.032
1/2 (0.500) 0.530 0.513 0.900 0.880 0.045 0.037
9/16 (0.5625) 0.596 0.576 0.985 0.960 0.045 0.037
5/8 (0.625) 0.663 0.641 1.070 1.045 0.050 0.042
11/16 (0.6875) 0.728 0.704 1.155 1.130 0.050 0.042
3/4 (0.750) 0.795 0.768 1.260 1.220 0.055 0.047
13/16 (0.8125) 0.861 0.833 1.315 1.290 0.055 0.047
7/8 (0.875) 0.927 0.897 1.410 1.380 0.060 0.052
1 (1.000) 1.060 1.025 1.620 1.590 0.067 0.059

Note : Dimensions are in inches.

Supplements:

Link Usage
Tooth Lock Washer Dimensions Calculator Calculator form of the tooth lock washers dimensions chart.

Reference:

  • ASME B18.21.1-2009 , Washers: Helical Spring-Lock, Tooth Lock, and Plain Washers (Inch Series)