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 6240-01-539-8227
NSN 5975-00-464-0693
NSN 5996-01-444-9936
NSN 5975-01-549-3346
NSN 6150-01-518-2107
NSN 6105-01-019-0663
NSN 5960-01-282-2386
NSN 6610-01-387-3648
NSN 6620-01-166-4893
NSN 5915-01-049-7925
NSN 5975-01-184-8405
NSN 5920-00-472-7231