The 30° helical flute thread mills will cut internal and external threads. The helical flute distributes side cutting pressure.
30° Helical Flute - Metric
Stub Acme Internal SPTM Thread Mills
Acme Internal SPTM Thread Mills
Metric 15 degree Helical Flute Thread Mills - Solid Carbide - Full Profile
Metric Straight Flute Thread Mills - Solid Carbide - Full Profile
BSPP / BSPT Thread Mills - Straight Flute