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 5945-00-113-5350
NSN 2925-00-113-6146
NSN 6130-00-212-4883
NSN 6320-00-845-3261
NSN 6240-00-243-7714
NSN 5996-01-457-0335
NSN 5985-00-269-5388
NSN 6135-00-862-5736
NSN 6685-01-528-6740
NSN 6240-01-458-1459
NSN 5985-01-280-5497
NSN 6650-01-389-0225