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 6610-01-112-6839
NSN 6645-01-388-0391
NSN 5855-01-149-4110
NSN 6685-00-863-3897
NSN 5945-01-422-3233
NSN 5999-01-542-3494
NSN 5925-00-816-9929
NSN 5950-00-752-8763
NSN 4140-01-311-6901
NSN 5960-01-495-0859
NSN 5895-00-624-5685
NSN 6150-00-410-8920