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 6135-00-016-0071
NSN 6145-00-663-6133
NSN 6110-00-126-4875
NSN 5996-01-351-1558
NSN 5930-01-509-7488
NSN 5930-01-614-6866
NSN 6145-01-420-6723
NSN 5950-01-362-7737
NSN 6110-01-309-7640
NSN 5965-01-633-8849
NSN 5960-00-220-9713
NSN 5855-01-378-1888