Four step counterbore
No other part numbers with same form, fit, and function found.
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 5990-01-487-0871
NSN 5945-01-529-3511
NSN 6145-01-283-9331
NSN 6685-01-183-8096
NSN 6610-01-453-4269
NSN 6105-01-627-1071
NSN 4140-01-494-9843
NSN 5855-01-426-5589
NSN 5999-00-236-2566
NSN 6620-01-330-8802
NSN 5925-01-241-5091
NSN 6145-01-597-5086