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 6240-01-512-1856
NSN 5945-01-490-6648
NSN 6620-00-133-2633
NSN 6685-00-554-3825
NSN 6135-00-990-1822
NSN 5985-01-193-8515
NSN 6150-00-959-6164
NSN 5855-01-604-9997
NSN 5855-01-079-8716
NSN 5915-01-290-4828
NSN 6620-01-262-9489
NSN 6145-01-634-0388