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 6145-01-176-1061
NSN 6130-00-929-6699
NSN 6220-00-445-4050
NSN 5930-01-222-1682
NSN 5910-01-571-8982
NSN 5975-01-008-1667
NSN 6110-01-374-9007
NSN 6150-01-420-6494
NSN 5960-00-231-0853
NSN 5920-01-283-2611
NSN 5945-00-995-0926
NSN 6620-00-060-0549