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 5950-01-634-0677
NSN 6150-01-613-2908
NSN 6145-00-136-9132
NSN 5835-01-502-9228
NSN 6240-01-177-1487
NSN 5960-01-157-7009
NSN 6135-00-299-6918
NSN 6685-01-538-6710
NSN 5999-00-572-1386
NSN 6240-01-158-6601
NSN 7035-01-232-2657
NSN 6130-01-641-8160