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 5960-00-720-0615
NSN 5915-01-389-1065
NSN 6135-00-926-8322
NSN 6240-01-468-4877
NSN 5945-01-178-3500
NSN 6105-00-548-2908
NSN 6240-01-423-0605
NSN 5855-01-335-8907
NSN 6620-01-328-7059
NSN 6110-01-013-9313
NSN 5855-01-159-1654
NSN 5985-01-430-9750