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 5990-00-885-0288
NSN 6685-01-650-1241
NSN 6220-01-443-1832
NSN 5996-01-518-1502
NSN 6650-01-614-7328
NSN 5975-01-597-0996
NSN 5950-01-241-8741
NSN 6620-00-351-9949
NSN 6645-00-522-4173
NSN 5950-01-288-3244
NSN 5945-00-131-7645
NSN 6320-01-476-7702