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ASME B18.21.1 TABLE 1 Standard Dimensions for Helical spring-lock washers, inch sizes

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Helical spring-lock washers, regular series

Dimensional Drawing and Technical Diagrams

1921_lj9oI2_B18.21.1-lock.jpg

Key Dimensions and Technical Parameters

Dimensions in inches: source ASME B18.21.1 -2009-Table 1 Regular series
Nominal washer size
A max
 A min
B max
T
mean
section thickness
(t1+t)/2
W min
No.2 (0.086)
 0.094 0.088 0.172 0.020 0.035
No.3 (0.099)
 0.107 0.101 0.195 0.025 0.040
No.4 (0.112)
 0.120 0.114 0.209 0.025 0.040
No.5 (0.125)
 0.133 0.127 0.236 0.031 0.047
No.6 (0.138)
 0.148 0.141 0.250 0.031 0.047
No.8 (0.164)
 0.174 0.167 0.293 0.040 0.055
No.10 (0.190)
 0.2 0.193 0.334 0.047 0.062
No.12 (0.216)
 0.227 0.220 0.377 0.056 0.070
1/4- (0.250)
 0.26 0.252 0.487 0.062 0.109
5/16- (0.3125)
 0.322 0.314 0.583 0.078 0.125
3/8- (0.375)
 0.385 0.377 0.680 0.094 0.141
7/16-(0.4375)
 0.45 0.44 0.776 0.109 0.156
1/2- (0.5)
 0.641 0.628 1.073 0.156 0.203
9/16- (0.5625)
 0.574 0.564 0.965 0.141 0.188
5/8- (0.625)
 0.641 0.628 1.073 0.156 0.203
11/16- (0.6875)
 0.704 0.691 1.170 0.172 0.219
3/4- (0.75)
 0.766 0.753 1.265 0.188 0.234
13/16-(0.8125)
 0.832 0.816 1.363 0.203 0.250
7/8- (0.875)
 0.894 0.878 1.459 0.219 0.266
15/16 (0.9375) 0.958 0.941 1.556 0.234 0.281
1- (1)
1.024
 1.003
1.656
0.25
0.297
1-1/16 (1.0625) 1.087 1.066 1.751 0.266 0.312
1-1/8 (1.125) 1.153 1.129 1.847 0.281 0.328
1-3/16 (1.875) 1.217 1.192 1.943 0.297 0.344
1- 1/4 (1.25) 1.280 1.254 2.036 0.312 0.359
1 - 5/16 (1.3125) 1.344 1.317 2.133 0.328 0.375
1 - 3/8 (1.375) 1.408 1.379 2.219 0.344 0.391
1 - 7/16 (1.4375) 1.472 1.442 2.234 0.359 0.406
1 - 1/2 (1.5) 1.534 1.504 2.419 0.375 0.422
1 - 5/8 (1.625) 1.663 1.663 2.553 0.389 0.424
1 - 3/4 (1.75) 1.798 1.758 2.679 0.389 0.424
1 - 7/8 (1.875) 1.914 1.833 2.811 0.422 0.427
2 (2) 20.39 2.008 2.936 0.422 0.427
2 - 1/4 (2.5) 2.293 2.262 3.221 0.440 0.442
2 - 1/2 (2.5) 2.543 2.512 3.471 0.440 0.442
2 - 3/4 (2.75) 2.793 2.762 3.824 0.458 0.491
3 (3) 3.043 3.012 4.074 0.458 0.491

Reproduced by permission of DIN Deutsches Institut für Normung e. V. The definitive version for the implementation of this standard is the edition bearing the most recent date of issue, obtainable from Beuth Verlag GmbH, Burggrafenstraße 6, 10787 Berlin, Germany.
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