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 5985-01-634-0635
NSN 6645-01-511-3272
NSN 6145-01-471-7422
NSN 6150-00-728-2485
NSN 6135-00-452-2266
NSN 6130-00-245-4302
NSN 5999-01-258-5721
NSN 6150-01-422-0421
NSN 5915-00-488-7437
NSN 5960-01-029-4253
NSN 6650-01-080-2855
NSN 6130-01-245-9226