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 4140-01-128-4939
NSN 6145-00-365-0121
NSN 5895-01-197-0206
NSN 2925-01-446-6976
NSN 5935-01-626-5423
NSN 6110-00-168-3807
NSN 6685-01-298-6859
NSN 5915-01-182-4798
NSN 4140-01-411-3595
NSN 6130-01-571-2070
NSN 6135-00-078-9931
NSN 6685-00-395-3272