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SAE Flat Washer Dimensions Per ASME B18.21.1
Size | Inside Diameter (ID) | Outside Diameter (OD) | Thickness (TH) | |||||
---|---|---|---|---|---|---|---|---|
Tolerance | Tolerance | |||||||
Basic | Plus | Minus | Basic | Plus | Minus | Max | Min | |
#4 | 0.125 | 0.008 | 0.005 | 0.312 | 0.008 | 0.005 | 0.040 | 0.025 |
#6 | 0.156 | 0.008 | 0.005 | 0.375 | 0.015 | 0.005 | 0.065 | 0.036 |
#8 | 0.188 | 0.008 | 0.005 | 0.438 | 0.015 | 0.005 | 0.065 | 0.036 |
#10 | 0.219 | 0.008 | 0.005 | 0.500 | 0.015 | 0.005 | 0.065 | 0.036 |
#12 | 0.250 | 0.015 | 0.005 | 0.562 | 0.015 | 0.005 | 0.080 | 0.051 |
1/4 | 0.281 | 0.015 | 0.005 | 0.625 | 0.015 | 0.005 | 0.080 | 0.051 |
5/16 | 0.344 | 0.015 | 0.005 | 0.688 | 0.015 | 0.007 | 0.080 | 0.051 |
3/8 | 0.406 | 0.015 | 0.005 | 0.812 | 0.015 | 0.007 | 0.080 | 0.051 |
7/16 | 0.469 | 0.015 | 0.005 | 0.922 | 0.015 | 0.007 | 0.080 | 0.051 |
1/2 | 0.531 | 0.015 | 0.005 | 1.062 | 0.030 | 0.007 | 0.121 | 0.074 |
9/16 | 0.594 | 0.015 | 0.005 | 1.156 | 0.030 | 0.007 | 0.121 | 0.074 |
5/8 | 0.656 | 0.030 | 0.007 | 1.312 | 0.030 | 0.007 | 0.121 | 0.074 |
3/4 | 0.812 | 0.030 | 0.007 | 1.469 | 0.030 | 0.007 | 0.160 | 0.108 |
7/8 | 0.938 | 0.030 | 0.007 | 1.750 | 0.030 | 0.007 | 0.160 | 0.108 |
1 | 1.062 | 0.030 | 0.007 | 2.000 | 0.030 | 0.007 | 0.160 | 0.108 |
1 1/8 | 1.250 | 0.030 | 0.007 | 2.250 | 0.030 | 0.007 | 0.160 | 0.108 |
1 1/4 | 1.375 | 0.030 | 0.007 | 2.500 | 0.030 | 0.007 | 0.192 | 0.136 |
1 3/8 | 1.500 | 0.030 | 0.007 | 2.750 | 0.030 | 0.007 | 0.192 | 0.136 |
1 1/2 | 1.625 | 0.030 | 0.007 | 3.000 | 0.030 | 0.007 | 0.192 | 0.136 |
1 3/4 | 1.875 | 0.045 | 0.010 | 3.375 | 0.045 | 0.010 | 0.213 | 0.153 |
2 | 2.125 | 0.045 | 0.010 | 3.750 | 0.045 | 0.010 | 0.213 | 0.153 |
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