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 2925-01-336-2820
NSN 6110-00-617-9512
NSN 6240-01-075-9397
NSN 5998-00-554-9725
NSN 6610-01-464-3037
NSN 6135-01-540-9136
NSN 5965-00-052-7596
NSN 5990-01-631-1952
NSN 6650-01-384-6595
NSN 6110-00-486-0514
NSN 6320-00-164-4087
NSN 5960-00-419-9964