US Wood Screws - Pilot Holes
Hard wood and soft wood pilot holes, shank clearance holes and countersink diameters.
Approximate hole size for wood screws used in hard wood and soft wood:
For full table - rotate the screen!
| Nominal Size no. | Nominal Shank Diameter (in) | Actual Shank Diameter (in) | Twist Drill Size | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pilot Holes | Shank Clearance Holes | 80o Countersink Diameter | ||||||||
| Hard Wood | Soft Wood | |||||||||
| Inch | No. | Inches | No. | Inch | No. | Actual Head Diameter (in) | Diameter (in) | |||
| 0 | 0.060 | 0.064 | 3/64 | 58 | 1/32 | 69 | 1/16 | 52 | 0.119 | 1/8 |
| 1 | 0.073 | 0.077 | 3/64 | 55 | 1/32 | 65 | 5/64 | 47 | 0.146 | 3/16 |
| 2 | 0.086 | 0.090 | 1/16 | 53 | 3/64 | 59 | 3/32 | 42 | 0.172 | 3/16 |
| 3 | 0.099 | 0.103 | 1/16 | 51 | 3/64 | 56 | 7/64 | 37 | 0.199 | 1/4 |
| 4 | 0.112 | 0.116 | 5/64 | 48 | 3/64 | 55 | 7/64 | 32 | 0.225 | 1/4 |
| 5 | 0.125 | 0.129 | 5/64 | 44 | 1/16 | 53 | 1/8 | 30 | 0.252 | 1/4 |
| 6 | 0.138 | 0.142 | 3/32 | 42 | 1/16 | 52 | 9/64 | 27 | 0.279 | 3/8 |
| 7 | 0.151 | 0.155 | 3/32 | 38 | 1/16 | 50 | 5/32 | 22 | 0.305 | 3/8 |
| 8 | 0.164 | 0.168 | 7/64 | 35 | 5/64 | 48 | 11/64 | 18 | 0.332 | 3/8 |
| 9 | 0.177 | 0.181 | 1/8 | 32 | 5/64 | 46 | 3/16 | 14 | 0.358 | 3/8 |
| 10 | 0.190 | 0.194 | 1/8 | 30 | 3/32 | 44 | 3/16 | 10 | 0.385 | 1/2 |
| 11 | 0.203 | 0.207 | 1/8 | 29 | 3/32 | 43 | 13/64 | 4 | 0.412 | 1/2 |
| 12 | 0.216 | 0.220 | 9/64 | 27 | 3/32 | 39 | 7/32 | 2 | 0.438 | 1/2 |
| 14 | 0.242 | 0.246 | 5/32 | 20 | 7/64 | 34 | 1/4 | D | 0.507 | 1/2 |
| 16 | 0.268 | 0.272 | 3/16 | 16 | 1/8 | 31 | 17/64 | I | 0.544 | 5/8 |
| 18 | 0.294 | 0.298 | 3/16 | 10 | 9/64 | 29 | 19/64 | N | 0.635 | 5/8 |
| 20 | 0.320 | 0.324 | 7/32 | 3 | 5/32 | 26 | 21/64 | P | 0.650 | 3/4 |
| 24 | 0.372 | 0.376 | 1/4 | D | 11/64 | 18 | 3/8 | V | 0.762 | 3/4 |
