STANDARD SPRING WASHER DIMENSIONS CHART

Spring washer dimensions chart for regular standard helical spring-lock washers according to ASME B18.21.1 "Washers: Helical Spring-Lock, Tooth Lock, and Plain Washers (Inch Series) " standard.

Spring Washer Dimensions
Nominal Size
(Nominal Thread dia., d)		 Inside Dia. A Max. Outside Dia. Min.
Mean
Section
Thickness
(ti + to)/2		 Min.  Section Width Min. Bearing Width
max. min. B T W BW
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 0.025 0.040 0.028
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 0.031 0.047 0.033
No.8 (0.164) 0.174 0.167 0.293 0.040 0.055 0.038
No.10 (0.190) 0.200 0.193 0.334 0.047 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 0.062 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 0.377 0.680 0.094 0.141 0.099
7/16 (0.4375) 0.450 0.440 0.776 0.109 0.156 0.109
1/2 (0.500) 0.512 0.502 0.869 0.125 0.171 0.120
9/16 (0.5625) 0.574 0.564 0.965 0.141 0.188 0.132
5/8 (0.625) 0.641 0.628 1.073 0.156 0.203 0.142
11/16 (0.6875) 0.704 0.691 1.170 0.172 0.219 0.153
3/4 (0.750) 0.766 0.753 1.265 0.188 0.234 0.164
13/16 (0.8125) 0.832 0.816 1.363 0.203 0.250 0.175
7/8 (0.875) 0.894 0.878 1.459 0.219 0.266 0.186
15/16 (0.9375) 0.958 0.941 1.556 0.234 0.281 0.197
1 (1.000) 1.024 1.003 1.656 0.250 0.297 0.208
1 1/16 (1.0625) 1.087 1.066 1.751 0.266 0.312 0.218
1 1/8 (1.125) 1.153 1.129 1.847 0.281 0.328 0.230
1 3/16 (1.1875) 1.217 1.192 1.943 0.297 0.344 0.241
1 1/4 (1.250) 1.280 1.254 2.036 0.312 0.359 0.251
1 5/16 (1.3125) 1.344 1.317 2.133 0.328 0.375 0.262
1 3/8 (1.375) 1.408 1.379 2.219 0.344 0.391 0.274
1 7/16 (1.4375) 1.472 1.442 2.324 0.359 0.406 0.284
1 1/2 (1.500) 1.534 1.504 2.419 0.375 0.422 0.295
1 5/8 (1.625) 1.663 1.633 2.553 0.389 0.424 0.297
1 3/4 (1.750) 1.789 1.758 2.679 0.389 0.424 0.297
1 7/8 (1.875) 1.914 1.883 2.811 0.422 0.427 0.299
2 (2.000) 2.039 2.008 2.936 0.422 0.427 0.299
2 1/4 (2.250) 2.293 2.262 3.221 0.440 0.442 0.309
2 1/2 (2.500) 2.543 2.512 3.471 0.440 0.442 0.309
2 3/4 (2.750) 2.793 2.762 3.824 0.458 0.491 0.344
3 (3.000) 3.043 3.012 4.074 0.458 0.491 0.344

Note : Dimensions are in inches.

Supplements:

Link Usage
Split Lock Washer Dimensions Calculator Calculator form of the spring washer dimensions chart.

Reference:

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