Thread Pitch Calculator

Your details

Metric uses ISO 68-1 geometry; Imperial uses Unified Thread Standard (UTS) with 60-degree flank angle.
Select a standard ISO metric thread size. The major diameter and pitch will be filled automatically.
Thread pitch
1.5mm

Axial distance between adjacent thread crests (metric units)

Threads per inch (TPI)16.93
Major diameter10mm
Minor diameter8.376mm
Pitch diameter9.026mm
Thread depth (H)1.299mm
Tap drill size8.5mm
Pitch (inches)0.0591in
Tap drill size (in)0.3346in
Major diameter (mm)10
Pitch diameter (mm)9.026
Minor diameter (mm)8.376
Tap drill (mm)8.5

Thread pitch 1.500 mm - coarse pitch (16.9 TPI).

  • A pitch of 1.500 mm equals 16.9 threads per inch (TPI = 25.4 / P).
  • The minor (root) diameter is 8.376 mm, which is 1.624 mm smaller than the major diameter.
  • Drill a 8.50 mm hole before tapping to achieve approximately 75% thread engagement, the standard for full-strength joints.

Next stepVerify the tolerance class (e.g. 6g for external, 6H for internal) from ISO 965-1 before ordering hardware.

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