A soft metal or nonmetal sleeve, designed to mate with a pin-rivet. it may include an external wrenching facility which breaks off at a perdetermined torque to form a head.
NSN 6135-01-255-9129
NSN 5985-00-552-4626
NSN 6145-01-197-3887
NSN 6610-01-495-5430
NSN 5950-00-167-3465
NSN 5910-00-813-5863
NSN 5910-00-218-1114
NSN 5960-01-435-1167
NSN 5999-01-630-5274
NSN 6135-01-568-9107
NSN 6220-01-512-0144
NSN 4140-01-061-9849