EN

Tap - Chamfer Form

Form A

Sketch of the gate shape of a tap Form A
  • long: 6 - 8 thread
  • straight flutes
  • for short through holes

Form B

Sketch of the gate shape of a tap Form B
  • medium: 3.5 - 5.5 threads
  • straight flutes with spiral point
  • for through holes in medium- and long chipping materials

Form C

Sketch of the gate shape of a tap Form C
  • short: 2 - 3 threads
  • straight and spiral flutes
  • for blind holes in medium and long chipping materials
  • for through holes in short-chipping materials

Form D

Sketch of the gate shape of a tap Form D
  • medium: 3.5 - 5 threads
  • straight and spiral flutes 15°
  • for blind holes with long thread runout
  • for short through holes

Form E

Sketch of the gate shape of a tap Form E
  • very short, 1.5 - 2 threads
  • straight and spiral flutes 15°
  • for blind holes with very short thread runout

Form F

Sketch of the gate shape of a tap Form F
  • very short, 1 - 1.5 threads
  • straight and spiral flutes
  • for blind holes with short thread runout
  • Avoid if possible.

Please note:
Short chamfers cut threads close to the bottom of the borehole.
Long chamfers reduce the forced on the cutting edges (recommended for materials with higher material strength)
Long chamfers increase the required torque.