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 5990-00-226-7894
NSN 6610-01-347-3005
NSN 6610-01-345-9040
NSN 6135-00-315-1187
NSN 5996-01-254-3892
NSN 5915-00-338-3375
NSN 5945-01-607-0482
NSN 6150-00-757-4853
NSN 5996-01-155-8924
NSN 6110-01-099-4334
NSN 5930-01-431-3731
NSN 6145-00-036-7085