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 5935-01-206-4968
NSN 6105-00-581-5331
NSN 4140-01-659-4817
NSN 5975-01-155-2324
NSN 5975-00-221-7175
NSN 5905-00-412-4279
NSN 5925-01-236-8070
NSN 6685-01-388-2236
NSN 5910-01-058-4282
NSN 6130-00-111-1320
NSN 6650-00-995-5741
NSN 5915-01-645-3051