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 6105-01-598-1841
NSN 6645-00-344-7558
NSN 6135-01-029-9315
NSN 5910-00-901-3878
NSN 7035-01-137-3642
NSN 6135-00-519-1325
NSN 6645-01-497-6543
NSN 5925-00-597-1558
NSN 5925-01-039-4098
NSN 6320-00-116-3658
NSN 6620-00-631-4599
NSN 5835-01-412-0344