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 6645-01-199-0062
NSN 5905-01-599-8508
NSN 5930-00-780-4685
NSN 6135-01-202-8113
NSN 5835-01-316-3255
NSN 5950-01-026-0902
NSN 5960-00-061-3155
NSN 5930-00-320-0961
NSN 6320-01-292-6635
NSN 5985-00-802-0923
NSN 5855-01-492-3497
NSN 6145-01-453-9191