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 5998-01-423-8820
NSN 4140-01-379-6886
NSN 5945-01-111-4306
NSN 5990-00-469-2604
NSN 7035-01-452-9086
NSN 5855-01-587-6166
NSN 6150-01-020-7881
NSN 5905-01-429-9943
NSN 6130-01-126-2032
NSN 7035-01-074-7634
NSN 7035-01-198-1512
NSN 6105-00-480-2728