A headless fastener externally threaded on both ends with each threaded portion of one but not necessarily the same nominal diameter. It is designed to be locked in place by either a ring, lock, serrated or a ring, lock, keyed.
NSN 5998-01-203-7299
NSN 5935-00-385-3635
NSN 5990-01-038-8943
NSN 5835-00-880-6477
NSN 5915-01-073-4482
NSN 6645-00-089-8842
NSN 5930-01-437-8823
NSN 5910-01-278-9009
NSN 5915-01-338-6431
NSN 5945-01-244-3863
NSN 6650-01-276-2869
NSN 6150-00-100-4757