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 6620-01-633-8443
NSN 5835-00-402-5607
NSN 5975-01-265-0686
NSN 5965-00-144-2543
NSN 5855-01-351-2541
NSN 6145-01-482-0078
NSN 5960-01-469-2006
NSN 5985-00-934-0153
NSN 2925-01-228-6554
NSN 6320-01-250-0290
NSN 6320-00-036-3688
NSN 5945-01-420-8927