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 5925-01-466-5675
NSN 6320-00-925-0558
NSN 5965-00-121-7569
NSN 5996-00-186-8709
NSN 5998-01-167-8819
NSN 5930-01-618-2361
NSN 5985-01-106-9031
NSN 2925-01-372-9455
NSN 5855-01-602-7895
NSN 5895-00-198-5537
NSN 5920-00-179-4580
NSN 5920-00-281-2488