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 5930-01-497-7900
NSN 5835-01-504-0837
NSN 5950-01-132-5008
NSN 5920-01-629-6934
NSN 6320-01-177-3192
NSN 5990-01-122-5629
NSN 6150-01-461-1652
NSN 5999-00-251-8905
NSN 6220-01-259-7881
NSN 5965-00-581-9978
NSN 2925-01-254-3068
NSN 6105-01-555-8757