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 6150-01-200-3591
NSN 5895-01-209-1617
NSN 6105-01-634-0322
NSN 6620-00-923-8470
NSN 5915-01-444-4069
NSN 5930-01-038-9694
NSN 5910-01-588-4899
NSN 6220-01-600-1647
NSN 5950-01-330-0570
NSN 5975-01-195-6760
NSN 6135-01-386-1452
NSN 6620-01-418-7562