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 6650-01-196-4667
NSN 4140-01-391-6462
NSN 6240-00-465-8574
NSN 5975-00-249-5331
NSN 5998-01-018-5913
NSN 2925-01-398-4312
NSN 5950-00-228-7184
NSN 5996-01-399-6677
NSN 5930-01-607-9395
NSN 6650-00-078-5773
NSN 5990-01-089-6743
NSN 5960-00-147-0519