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 5930-01-301-5527
NSN 5999-01-481-3069
NSN 6610-01-617-6495
NSN 5975-01-468-6319
NSN 6650-01-604-9073
NSN 5895-00-727-8708
NSN 5855-00-832-9341
NSN 5990-01-424-2954
NSN 5999-01-023-5188
NSN 6145-01-591-7939
NSN 5965-01-036-9945
NSN 6645-01-580-3258