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 4140-01-209-5856
NSN 5855-01-618-9749
NSN 5990-01-268-3857
NSN 5996-00-525-1777
NSN 5985-01-125-6788
NSN 5930-01-175-0907
NSN 5930-01-571-8587
NSN 6135-01-336-3115
NSN 6650-01-447-2858
NSN 4140-01-408-5132
NSN 6150-01-241-3725
NSN 5950-01-365-8040