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 5985-01-230-9740
NSN 5996-01-435-1093
NSN 7035-01-568-2427
NSN 6130-00-647-8471
NSN 5965-01-605-4703
NSN 6220-01-183-5378
NSN 6220-01-141-7709
NSN 6645-00-347-0356
NSN 2925-01-656-0392
NSN 5925-01-109-3582
NSN 6150-00-175-7868
NSN 5910-00-470-0188