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 5915-00-153-0002
NSN 5945-01-431-8124
NSN 5999-01-025-7490
NSN 6650-01-485-3444
NSN 6610-01-449-6676
NSN 5999-01-449-4530
NSN 6320-00-908-6841
NSN 6130-01-261-6861
NSN 5925-01-421-1139
NSN 5895-01-409-2949
NSN 5996-00-553-7348
NSN 6620-00-290-6505