Wood Screws
Shank diameters - pilot holes
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Wood screws shank diameters and recommended pilot holes are indicated below.
Shank holes and pilot holes is recommended to prevent wood from splitting and allows for tighter joints.
| Size Number | Shank Diameter | Pilot Hole Diameter (in) | ||
| Decimal (in) |
Nearest Fractional (in) |
Softwood | 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 | 5/32 | 5/64 | 3/32 |
| 9 | 0.177 | 11/64 | 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 | 5/16 | 11/64 | 13/64 |
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