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 6150-00-006-4231
NSN 5945-01-142-3321
NSN 5905-00-062-6663
NSN 5930-00-840-5312
NSN 5975-01-033-4892
NSN 5925-00-062-6948
NSN 5990-00-284-0537
NSN 4140-01-212-7994
NSN 5975-01-556-6719
NSN 6685-01-318-4104
NSN 5996-01-566-0344
NSN 6110-00-199-5451