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 5855-01-529-5567
NSN 5960-01-313-0681
NSN 5915-01-327-6637
NSN 6240-00-342-9756
NSN 5925-01-658-2270
NSN 5945-01-248-2208
NSN 5965-01-287-7235
NSN 6105-00-338-0868
NSN 6150-00-148-8515
NSN 5920-01-322-8928
NSN 6220-01-016-4888
NSN 5960-01-536-9763