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These dimensions are for standard American wood screws, which are tapered. They are not suitable for screws which are not tapered, such as dry wall screws. All dimensions are in inches. The shank pilot hole is one which will clear the thickest part of the screw body.
| Screw gage # |
Body dia. | Shank pilot hole |
Pilot hole in softwood |
Pilot hole in hardwood |
|---|---|---|---|---|
| 0 | 0.060 | 1/16 | 1/64 | 1/32 |
| 1 | 0.073 | 5/64 | 1/32 | 1/32 |
| 2 | 0.086 | 3/32 | 1/32 | 3/64 |
| 3 | 0.099 | 7/64 | 3/64 | 1/16 |
| 4 | 0.112 | 7/64 | 3/64 | 1/16 |
| 5 | 0.125 | 1/8 | 1/16 | 5/64 |
| 6 | 0.138 | 9/64 | 1/16 | 5/64 |
| 7 | 0.151 | 5/32 | 1/16 | 3/32 |
| 8 | 0.164 | 11/64 | 5/64 | 3/32 |
| 9 | 0.177 | 3/16 | 5/64 | 7/64 |
| 10 | 0.190 | 3/16 | 3/32 | 7/64 |
| 11 | 0.203 | 13/64 | 3/32 | 1/8 |
| 12 | 0.216 | 7/32 | 7/64 | 1/8 |
| 14 | 0.242 | 1/4 | 7/64 | 9/64 |
| 16 | 0.268 | 17/64 | 9/64 | 5/32 |
| 18 | 0.294 | 19/64 | 9/64 | 3/16 |
| 20 | 0.320 | 21/64 | 11/64 | 13/64 |
| 24 | 0.372 | 3/8 | 3/16 | 7/32 |
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Last revised: 11 August 2004.