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Tap Drill Size Chart

Metric & pipe thread tap drill reference with search — tap drill = major diameter − pitch

Metric Thread Tap Drill Sizes

Tap drill = Major diameter − Pitch. Close-fit drill is the nearest standard drill size. Percent of thread engagement ≈ 75% (standard).
Thread Pitch (mm) Type Tap Drill Close-Fit Drill Free-Fit Drill % Engagement

Custom Tap Drill Calculator

Enter any metric thread major diameter and pitch to calculate tap drill size.

Formulas & Notes