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 6320-01-544-6447
NSN 6105-01-138-4894
NSN 6150-01-441-9621
NSN 5905-00-139-5854
NSN 6145-01-487-8043
NSN 6645-00-761-7256
NSN 6240-00-454-9293
NSN 6650-00-187-5388
NSN 5985-00-079-0598
NSN 6105-00-435-2713
NSN 5835-00-386-4966
NSN 6135-00-676-5807