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 6240-01-358-7127
NSN 5915-01-056-6796
NSN 6645-00-072-9243
NSN 6145-00-208-6843
NSN 5925-00-961-9179
NSN 5985-00-909-6497
NSN 6145-01-270-9357
NSN 2925-01-478-8191
NSN 5985-01-212-9180
NSN 5910-00-446-6571
NSN 6645-00-860-6967
NSN 6645-00-153-3834