Pilot Hole Size for a #8 Screw
The exact pilot bit for a #8 screw depends on the material. Use 7/64 in for softwood and 1/8 in for hardwood.
| Material | Pilot bit (in) | Notes |
|---|---|---|
| Softwood (pine, cedar) | 7/64 | Standard for general work |
| Hardwood (oak, maple) | 1/8 | Prevents splitting in dense grain |
| Plywood | 7/64 | Keep away from the edge to avoid breakout |
| MDF / particleboard | 1/8 | Drill into the face, not the edge |
Clearance (shank) hole for a #8 screw: 11/64 in. Countersink: 5/16 in.
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