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 6240-01-401-5340
NSN 5950-00-273-9604
NSN 5835-01-488-6678
NSN 5975-00-244-6118
NSN 6685-01-145-2478
NSN 5999-01-459-7903
NSN 6610-01-475-7551
NSN 6105-01-197-7468
NSN 6320-01-652-3806
NSN 6150-01-392-0065
NSN 5985-00-182-8122
NSN 5960-01-599-9821