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Drill Bit Size Lookup

Pilot hole and anchor hole bit sizes for wood screws, machine screws, and wall anchors.

Updated April 2026

ApplicationScrew / anchor size

Recommended bit

3/32"

0.0938 in · 2.38 mm

Alternatives

1/8

Notes

Softwood: 3/32" - Hardwood: 7/64"

Softwood grips threads easily so smaller pilot is fine. Hardwood needs a larger pilot to prevent splitting — go up one bit size if the screw still binds.

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What it does

#8 wood screw in softwood = 3/32" pilot. In hardwood = 7/64". Plus anchor and tap-hole sizes, in fractional, decimal, and mm.

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How to use it

Pick application + size.
Read bit size.
Softwood vs hardwood notes.