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These straight flute thread mills have the root radius that is required for the external "UNJ" thread.
External - UNJ
Acme Internal SPTM Thread Mills
Acme Single Profile Thread Mills
BSPP / BSPT Thread Mills - Straight Flute
Metric 15° Helical Flute Thread Mills - Solid Carbide - Full Profile
Metric 30° Helical Flute Thread Mills - Solid Carbide - Full Profile