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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
Stub Acme Internal SPTM Thread Mills
Metric Straight Flute Thread Mills - Solid Carbide - Full Profile
Acme Internal SPTM Thread Mills
Metric 30 degree Helical Flute Thread Mills - Solid Carbide - Full Profile
BSPP / BSPT Thread Mills - Straight Flute