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 5950-01-476-1444
NSN 6650-00-087-6428
NSN 6620-00-409-4975
NSN 5915-01-424-0767
NSN 6110-01-499-7990
NSN 5998-01-338-9447
NSN 5905-01-540-0453
NSN 5855-01-579-9859
NSN 5945-01-186-8072
NSN 5950-01-191-3313
NSN 2925-01-303-5266
NSN 5920-00-417-4624