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 6620-01-504-5756
NSN 7035-01-607-5696
NSN 4140-00-912-1904
NSN 6650-01-029-2995
NSN 5925-00-483-3138
NSN 5985-01-155-6194
NSN 6135-01-375-6724
NSN 5999-01-479-6429
NSN 6620-01-385-6172
NSN 5996-01-653-8866
NSN 7035-01-512-1826
NSN 5835-01-416-6449