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Tap & Drill Chart

Pick a thread and get the tap drill, pitch and clearance holes. Metric and imperial.

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Tap drill (≈75% thread)
—
Pitch
—
Major Ø
—
Clearance holes
Close
—
Normal
—
Loose
—
Tap drill shown is for ~75% thread engagement (general use). For tough materials or hand-tapping, drill slightly larger (lower % thread) to reduce tap breakage.

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Tap drill sizes by thread

Metric coarse

Metric fine

UNC

UNF