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 4140-01-435-6198
NSN 5920-01-395-7586
NSN 6220-00-272-7497
NSN 6145-01-515-2450
NSN 5895-00-550-6580
NSN 6145-01-250-2006
NSN 5985-01-416-3380
NSN 6620-01-360-4472
NSN 5910-00-022-6000
NSN 5998-01-034-6421
NSN 6135-01-433-2062
NSN 6650-00-453-9195