In accordance us army drawing 11b5090697
An internal threading tool with longitudinally separated cutting edges designed to form specific threads.
Classification: Tools for tapping or threading, parts thereof, of base metal
NSN 6145-01-136-4622
NSN 5945-01-237-7303
NSN 6110-00-534-1441
NSN 6620-01-225-3825
NSN 7035-00-541-8516
NSN 6685-01-383-3881
NSN 5990-01-331-2221
NSN 5950-01-501-5682
NSN 5945-00-595-8708
NSN 6220-00-231-2687
NSN 5925-00-834-0272
NSN 5990-01-392-5682