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 6110-01-109-0434
NSN 5935-00-275-7862
NSN 5935-01-061-0224
NSN 6110-01-197-9093
NSN 5998-00-565-6123
NSN 5895-01-401-5388
NSN 5945-01-201-7433
NSN 6110-01-189-1404
NSN 6130-01-442-3078
NSN 6220-01-634-0660
NSN 6620-00-308-2531
NSN 6650-01-599-6741