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 5920-01-422-4151
NSN 5925-01-411-5222
NSN 5998-00-111-8279
NSN 4140-00-777-6434
NSN 6145-00-262-3345
NSN 6610-01-584-9816
NSN 5855-01-223-0833
NSN 6320-00-228-5678
NSN 5905-00-058-6328
NSN 5915-01-281-8559
NSN 6105-00-357-1801
NSN 6145-00-327-4770