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 6150-01-249-7306
NSN 5945-01-130-9501
NSN 5960-01-308-2474
NSN 5895-01-208-0234
NSN 5855-01-502-9403
NSN 6130-00-186-8460
NSN 5996-00-871-9093
NSN 5996-00-424-8883
NSN 6130-01-624-5915
NSN 5920-00-509-5073
NSN 5835-00-269-2232
NSN 5945-00-905-6692