In accordance with 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 5999-01-554-9234
NSN 5935-00-089-7039
NSN 5950-01-394-5352
NSN 5999-01-512-6028
NSN 5905-01-399-7237
NSN 6150-01-630-6935
NSN 5910-01-160-6988
NSN 5999-01-078-3779
NSN 5935-01-012-4350
NSN 5960-01-273-7044
NSN 5965-01-361-9760
NSN 5855-01-052-3678