Pilot Hole Reference
Calculate pilot hole sizes for screws and fasteners
Settings
Configure unit system and filter options
Search
Search by screw type, size, or notes
No Results Found
Enter a search term or adjust your filters to find pilot hole data
Reference Information
Pilot Hole: Pre-drilled hole for the screw thread
Clearance Hole: Hole for the screw shank to pass through
Countersink: Recessed hole for the screw head
Note: These are general guidelines. Always test on scrap material first.
About this calculator
Pilot Hole Reference: A fastener reference tool for selecting practical pilot-hole drill sizes.
How it works
- Choose screw or fastener type and material.
- Select diameter, thread style, and unit standard.
- The tool returns recommended pilot and clearance hole sizes.