US Machine Screw Diameters
| Size |
Nominal Thread Diameter |
| Decimal |
Nearest Fractional |
| #0 |
0.060" |
1/16" |
| #1 |
0.073" |
5/64" |
| #2 |
0.086" |
3/32" |
| #3 |
0.099" |
7/64" |
| #4 |
0.112" |
7/64" |
| #5 |
0.125" |
1/8" |
| #6 |
0.138" |
9/64" |
| #8 |
0.164" |
5/32" |
| #10 |
0.190" |
3/16" |
| #12 |
0.216" |
7/32" |
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* Nominal thread diameter is measured on the outside of the threads per ASME B18.6.3
For more information about how to measure diameter see our Measuring Fastener Diameter page.
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