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 6240-00-076-2752
NSN 5990-01-411-8548
NSN 6105-01-492-5723
NSN 5855-00-198-3197
NSN 6110-01-179-0717
NSN 6645-01-633-1852
NSN 5910-01-116-1784
NSN 5915-00-343-6814
NSN 6110-01-193-9842
NSN 6135-01-502-5787
NSN 5855-01-657-7657
NSN 5855-00-688-9954