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 6645-00-235-4685
NSN 6610-01-571-8038
NSN 6240-01-034-3297
NSN 5920-01-438-6412
NSN 7035-01-314-7559
NSN 6150-01-411-5216
NSN 6150-00-513-0993
NSN 5930-00-004-1217
NSN 5960-01-249-2602
NSN 6240-01-167-0336
NSN 5930-01-471-3965
NSN 5905-00-107-6198