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 5855-00-532-0025
NSN 6645-01-416-3749
NSN 6320-01-296-3181
NSN 5915-01-604-2947
NSN 5930-00-824-7254
NSN 6145-01-313-9869
NSN 6645-00-357-8827
NSN 4140-01-509-0738
NSN 5960-00-231-3767
NSN 5996-01-043-2105
NSN 7035-01-183-7550
NSN 5835-00-507-3561