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 5990-01-092-1963
NSN 6150-01-451-4898
NSN 6240-00-311-6180
NSN 4140-01-432-4027
NSN 5895-01-065-0106
NSN 6645-00-385-3684
NSN 4140-00-816-0603
NSN 6110-01-494-0225
NSN 6150-01-317-1594
NSN 5965-00-285-0745
NSN 5990-01-571-7468
NSN 5910-00-883-7246