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ASME B18.21.1 Regular Helical Spring Lock Washers
ASME B18.21.1 Heavy Helical Spring Lock Washers
Dimensions of ASME B18.21.1 Heavy 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
0.182
0.025
0.040
0.028
No.3 (0.099)
0.107
0.101
0.209
0.031
0.047
0.033
No.4 (0.112)
0.120
0.114
0.223
No.5 (0.125)
0.133
0.127
0.252
0.055
0.038
No.6 (0.138)
0.148
0.141
0.266
No.8 (0.164)
0.174
0.167
0.307
0.062
0.043
No.10 (0.190)
0.200
0.193
0.350
0.056
0.070
0.049
No.12 (0.216)
0.227
0.220
0.391
0.063
0.077
0.054
1/4 (0.250)
0.260
0.489
0.110
5/16 (0.3125)
0.322
0.314
0.593
0.097
0.130
0.091
3/8 (0.375)
0.385
0.377
0.688
0.115
0.145
7/16 (0.4375)
0.450
0.440
0.784
0.160
0.112
1/2 (0.500)
0.512
0.502
0.879
0.151
0.176
0.123
9/16 (0.5625)
0.574
0.564
0.975
0.170
0.135
5/8 (0.625)
0.641
0.628
1.087
0.189
0.210
0.147
11/16 (0.6875)
0.704
0.691
1.186
0.207
0.159
3/4 (0.750)
0.766
0.753
1.285
0.226
0.244
0.171
13/16 (0.8125)
0.832
0.816
1.387
0.246
0.262
0.183
7/8 (0.875)
0.894
0.878
1.489
0.281
0.197
15/16 (0.9375)
0.958
0.941
1.590
0.284
0.298
1 (1.000)
1.024
1.003
1.700
0.306
0.319
1 1/16 (1.0625)
1.066
1.803
0.326
0.338
0.237
1 1/8 (1.125)
1.153
1.129
1.903
0.345
0.356
0.249
1 3/16 (1.1875)
1.217
1.192
2.001
0.364
0.373
0.261
1 1/4 (1.250)
1.280
1.254
2.104
0.384
0.393
0.275
1 5/16 (1.3125)
1.344
1.317
2.203
0.403
0.410
0.287
1 3/8 (1.375)
1.408
1.379
2.301
0.422
0.427
0.299
1 7/16 (1.4375)
1.472
1.442
2.396
0.442
0.309
1 1/2 (1.500)
1.534
1.504
2.491
0.458
0.321
1 5/8 (1.625)
1.663
1.633
2.694
0.491
0.344
1 3/4 (1.750)
1.789
1.758
2.820
1 7/8 (1.875)
1.914
1.883
2.945
2 (2.000)
2.039
2.008
3.144
0.496
0.526
0.368
2 1/4 (2.250)
2.293
2.262
3.398
2 1/2 (2.500)
2.543
2.512
3.648
2 3/4 (2.750)
2.793
2.762
3.910
0.532
0.372
3 (3.000)
3.043
3.012
4.160
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