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 5915-00-287-9923
NSN 5905-00-416-4784
NSN 5945-01-131-9137
NSN 5910-01-350-5052
NSN 6135-01-419-0779
NSN 6150-01-130-5212
NSN 5855-00-361-0167
NSN 6150-01-239-1974
NSN 5950-01-069-2784
NSN 6135-01-271-7151
NSN 5895-01-337-5156
NSN 6130-00-813-7453