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ASME B18.21.1 Heavy Helical Spring Lock Washers
ASME B18.21.1 Regular Helical Spring Lock Washers
Dimensions of ASME B18.21.1 Regular Helical Spring Lock Washers
Nominal Thread diameter
Inside Diameter
Outside Diameter
Mean Section Thicknes (ti + to)/2
Section Width
Bearing Width
Nominal Size
A
B
T
W
BW
Size
Max
Min
No.2 (0.086)
0.094
0.088
0.172
0.020
0.035
0.024
No.3 (0.099)
0.107
0.101
0.195
0.025
0.040
0.028
No.4 (0.112)
0.120
0.114
0.209
No.5 (0.125)
0.133
0.127
0.236
0.031
0.047
0.033
No.6 (0.138)
0.148
0.141
0.250
No.8 (0.164)
0.174
0.167
0.293
0.055
0.038
No.10 (0.190)
0.200
0.193
0.334
0.062
0.043
No.12 (0.216)
0.227
0.220
0.377
0.056
0.070
0.049
1/4 (0.250)
0.260
0.252
0.487
0.109
0.076
5/16 (0.3125)
0.322
0.314
0.583
0.078
0.125
0.087
3/8 (0.375)
0.385
0.680
0.099
7/16 (0.4375)
0.450
0.440
0.776
0.156
1/2 (0.500)
0.512
0.502
0.869
0.171
9/16 (0.5625)
0.574
0.564
0.965
0.188
0.132
5/8 (0.625)
0.641
0.628
1.073
0.203
0.142
11/16 (0.6875)
0.704
0.691
1.170
0.219
0.153
3/4 (0.750)
0.766
0.753
1.265
0.234
0.164
13/16 (0.8125)
0.832
0.816
1.363
0.175
7/8 (0.875)
0.894
0.878
1.459
0.266
0.186
15/16 (0.9375)
0.958
0.941
1.556
0.281
0.197
1 (1.000)
1.024
1.003
1.656
0.297
0.208
1 1/16 (1.0625)
1.087
1.066
1.751
0.312
0.218
1 1/8 (1.125)
1.153
1.129
1.847
0.328
0.230
1 3/16 (1.1875)
1.217
1.192
1.943
0.344
0.241
1 1/4 (1.250)
1.280
1.254
2.036
0.359
0.251
1 5/16 (1.3125)
1.344
1.317
2.133
0.375
0.262
1 3/8 (1.375)
1.408
1.379
2.219
0.391
0.274
1 7/16 (1.4375)
1.472
1.442
2.324
0.406
0.284
1 1/2 (1.500)
1.534
1.504
2.419
0.422
0.295
1 5/8 (1.625)
1.663
1.633
2.553
0.389
0.424
1 3/4 (1.750)
1.789
1.758
2.679
1 7/8 (1.875)
1.914
1.883
2.811
0.427
0.299
2 (2.000)
2.039
2.008
2.936
2 1/4 (2.250)
2.293
2.262
3.221
0.442
0.309
2 1/2 (2.500)
2.543
2.512
3.471
2 3/4 (2.750)
2.793
2.762
3.824
0.458
0.491
3 (3.000)
3.043
3.012
4.074
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