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 5915-01-174-3462
NSN 4140-01-104-3731
NSN 6220-01-401-5337
NSN 5999-01-065-3711
NSN 6150-01-400-4211
NSN 6620-01-090-3803
NSN 5996-00-104-8293
NSN 5996-00-163-1797
NSN 5999-00-548-7722
NSN 5915-01-583-5420
NSN 5990-00-581-5947
NSN 6110-01-544-3949