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 6240-00-307-9650
NSN 6620-00-853-2563
NSN 6620-01-454-5717
NSN 7035-00-312-3055
NSN 5985-01-425-0285
NSN 5985-01-615-2567
NSN 5895-01-170-4309
NSN 6240-01-433-8639
NSN 6620-00-543-6562
NSN 5920-00-076-6763
NSN 6650-01-359-3452
NSN 6645-01-381-0656