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 5895-01-550-7811
NSN 5935-01-125-5878
NSN 6320-00-242-3300
NSN 6685-01-246-4638
NSN 6645-01-310-7348
NSN 6105-00-992-7925
NSN 5905-01-359-8879
NSN 5960-01-391-4701
NSN 5895-01-072-5012
NSN 6645-00-810-7229
NSN 5996-00-525-1777
NSN 5950-00-408-6150