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 5999-01-538-5059
NSN 4140-01-177-8495
NSN 2925-00-054-3550
NSN 5920-01-461-3718
NSN 6650-00-466-1697
NSN 5960-00-064-2952
NSN 5855-01-231-4945
NSN 5905-00-974-5518
NSN 6220-00-279-8819
NSN 5915-01-391-4664
NSN 5985-01-481-8649
NSN 5855-01-351-7313