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 6320-01-157-9076
NSN 6240-01-384-8802
NSN 6320-01-220-2264
NSN 7035-01-337-8128
NSN 5945-01-089-6679
NSN 5975-00-541-8531
NSN 6130-01-106-3462
NSN 5999-01-246-5168
NSN 5975-01-631-4091
NSN 5905-01-322-7915
NSN 6320-01-527-0211
NSN 5950-01-472-2467