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 6145-00-547-0920
NSN 5905-01-513-9737
NSN 5975-01-585-7538
NSN 5920-00-503-4850
NSN 5985-01-406-0066
NSN 6105-01-284-5182
NSN 6645-01-575-4181
NSN 6130-00-538-0875
NSN 5960-01-483-9174
NSN 5996-00-823-6081
NSN 5915-00-205-2615
NSN 6150-01-468-6642