Tap Drill Size for Metric Threads

Find the recommended tap drill hole diameter for ISO metric coarse and fine pitch threads.

Select nominal thread diameter (M1 to M52). The thread pitch dropdown will automatically populate with standard coarse and fine pitch options.

Thread diameter: mm

Thread pitch: mm

Nominal diameter ranges from 1 to 52 mm.

Pitch options range from 0.2 to 5 mm (coarse standard pitch, 1st fine, 2nd fine, 3rd fine).

Drill Diameter ≈ Nominal Diameter (d) − Pitch (P)