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 6130-01-433-5798
NSN 5915-01-145-4989
NSN 6110-00-155-4303
NSN 6320-00-937-5625
NSN 6145-01-039-9831
NSN 2925-01-327-3069
NSN 5910-00-707-4900
NSN 6650-00-158-3683
NSN 5930-01-451-0696
NSN 5960-00-161-3728
NSN 6645-01-056-5291
NSN 5915-01-351-7979