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 5915-00-613-8577
NSN 6650-01-272-9746
NSN 5835-01-360-2657
NSN 6320-01-062-9351
NSN 6240-00-119-4182
NSN 6620-00-415-2768
NSN 5895-01-392-0872
NSN 5945-01-333-9386
NSN 5925-01-537-0180
NSN 5925-00-420-1386
NSN 6145-01-395-7850
NSN 5945-00-167-1529