The 15° helical flute thread mills are non-crest cutting for internal threads only. The helical flute distributes the side cutting pressure.
15° Helical Flute - Metric
SPTM Thread Mills - Internal Stub Acme
SPTM Thread Mills - Internal Acme
TM - Metric Thread Mills -30 degree Helical Flutes - Solid Carbide - Full Profile
TM - Metric Thread Mills -Straight Flute - Solid Carbide - Full Profile
TM- BSPP / BSPT Thread Mills - Straight Flute