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 5905-00-935-6507
NSN 4140-01-412-9110
NSN 6150-00-531-9841
NSN 6650-00-184-1581
NSN 5925-01-421-4473
NSN 5996-01-549-7968
NSN 5965-00-868-7061
NSN 5925-00-488-9182
NSN 6135-00-087-5300
NSN 5925-01-445-7326
NSN 5915-00-320-6989
NSN 5915-01-463-9241