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 5920-01-320-9357
NSN 5985-00-104-5981
NSN 5910-01-326-8364
NSN 5925-00-916-8605
NSN 5999-00-148-9072
NSN 6320-00-242-3300
NSN 5910-00-231-7726
NSN 5930-00-413-1014
NSN 5996-01-218-6468
NSN 6220-01-197-7680
NSN 5950-00-156-2220
NSN 6130-01-400-3651