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 2925-01-148-4533
NSN 4140-01-409-1764
NSN 5945-01-147-5727
NSN 6220-00-676-0904
NSN 6240-01-461-1032
NSN 6620-01-420-1735
NSN 5915-00-375-5000
NSN 5905-00-661-0531
NSN 6110-01-383-3255
NSN 5855-01-339-7675
NSN 5985-00-011-1092
NSN 6220-01-082-7766