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 6145-01-350-4677
NSN 5985-01-013-5724
NSN 5935-01-422-1555
NSN 6650-01-347-2203
NSN 6620-00-249-7034
NSN 4140-01-611-5424
NSN 6135-01-363-5109
NSN 2925-01-347-9346
NSN 6220-00-231-4934
NSN 6650-01-555-6661
NSN 5999-01-127-3687
NSN 5910-00-081-1795