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 5835-01-553-6772
NSN 5910-00-323-0607
NSN 5990-01-124-9063
NSN 5920-01-423-4775
NSN 5935-01-625-0633
NSN 5855-01-584-4128
NSN 5975-01-445-6261
NSN 6145-01-460-8927
NSN 6610-01-018-9122
NSN 6150-01-455-7995
NSN 6620-00-900-3986
NSN 6645-01-190-0085