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 5930-01-287-9744
NSN 5855-01-088-4699
NSN 7035-01-556-9060
NSN 6240-00-691-1397
NSN 5945-01-276-9059
NSN 5999-00-189-0772
NSN 5920-01-360-5681
NSN 5975-01-375-3517
NSN 6105-01-124-8054
NSN 6110-00-678-0763
NSN 6240-01-386-4594
NSN 5930-01-433-2422