Tap Nomenclature (Regrinding)

AA 1

d3 di dm d1

P A B

ε

T

S

γ

A-A

Δ1

d1Major diameter
dmFlank diameter
diMinor diameter
d3Chamfer diameter
PPitch
aFlank angle
ßChamfer angle
jGun nose angle
ϒGun nose front rake angle
  • Chamfer relief
  • 1 Pitch diameter relief on the land
ϒ1Rake angle
TWidth of land
SFlute width
d5Web thickness
εAngle of spiral flute

B

d5 B-B