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 2925-01-568-3705
NSN 5915-01-244-3616
NSN 5920-00-585-0104
NSN 6620-01-304-8055
NSN 6130-00-147-4657
NSN 5996-01-479-4086
NSN 5920-00-564-3627
NSN 5975-01-646-0874
NSN 2925-00-403-5036
NSN 5915-01-601-9713
NSN 2925-01-627-6568
NSN 6145-00-062-7897