Wood Screw Pilot Hole Sizes (in)
| Size
Number | Hard Wood | Soft Wood | Countersink
Size | ||
|---|---|---|---|---|---|
| Tapered
Bit | Straighy
Bit | Tapered
Bit | Straighy
Bit | ||
| 2 | 3/32 | 1/16 | 5/64 | 1/16 | 1/4 |
| 3 | 7/64 | 5/64 | 3/32 | 1/16 | 1/4 |
| 4 | 7/64 | 5/64 | 3/32 | 1/16 | 1/4 |
| 5 | 1/8 | 3/32 | 7/64 | 5/64 | 5/16 |
| 6 | 9/64 | 7/64 | 1/8 | 3/32 | 5/16 |
| 7 | 5/32 | 7/64 | 9/64 | 3/32 | 5/16 |
| 8 | 11/64 | 1/8 | 5/32 | 7/64 | 3/8 |
| 9 | 3/16 | 9/64 | 11/64 | 1/8 | 3/8 |
| 10 | 13/64 | 9/64 | 3/16 | 1/8 | 7/16 |
| 12 | 7/32 | 5/32 | 13/64 | 9/64 | 7/16 |
| 14 | 1/4 | 11/64 | 15/64 | 5/32 | 1/2 |
| 16 | 9/32 | 3/16 | 17/64 | 11/64 | 9/16 |
| 18 | 5/16 | 7/32 | 19/64 | 13/64 | 5/8 |
| 20 | 21/64 | 15/64 | 5/16 | 7/32 | 3/4 |
| 24 | 3/8 | 17/64 | 3/8 | 1/4 | 3/4 |