Acme thread mills come in both acme and stub acme configurations. Different tools are available to cut the internal and external thread.
SPTM - Acme / Stub Acme
Acme Internal SPTM Thread Mills
Stub Acme Internal SPTM Thread Mills
Stub Acme Single Profile Thread Mills
UN / Metric - Single Profile Thread Mills - Starting at .120 to .488 inch diameter
UN / Metric - Single Profile Thread Mills - - Starting at .032 to .098 inch diameter