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Choice of pre-hole diameter

Tapping by material deformation / rollforming has several advantages when compared with cutting taps:

  • Tapping without chips
  • More resistant threads
  • A better tap life
  • Threads with good shiny appearance.
Tapping by deformation

However, rollforming taps demand a precise pre-holes that is usually larger than the one required for a cutting tap.

A correctly-sized pre-hole must achieve a thread fill of 65% to 75%.

Tapping hole piercing too small

Pre-hole too small

Tapping hole piercing correct

Pre-hole correct

Tapping hole piercing too big

Pre-hole too big

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