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 5925-00-236-5657
NSN 5960-00-611-7175
NSN 6620-01-586-6166
NSN 5925-00-449-1706
NSN 5895-01-280-3711
NSN 5965-00-241-2521
NSN 6320-01-422-1212
NSN 5910-00-846-9576
NSN 5910-01-389-4042
NSN 5855-00-532-0025
NSN 4140-00-373-4833
NSN 6320-00-270-8222