US Wood Screws - Nominal Sizes
Wood screws - nominal sizes vs. diameters.
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 tighter joints.
| Nominal Size no. | Shank Diameter | |
|---|---|---|
| Decimal (in) | Nearest Fractional (in) | |
| 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 |
| 7 | 0.151 | 5/32 |
| 8 | 0.164 | 5/32 |
| 9 | 0.177 | 11/64 |
| 10 | 0.190 | 3/16 |
| 11 | 0.203 | 13/64 |
| 12 | 0.216 | 7/32 |
| 14 | 0.242 | 1/4 |
| 16 | 0.268 | 17/64 |
| 18 | 0.294 | 19/64 |
| 20 | 0.320 | 5/16 |
