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 5910-00-417-0825
NSN 6130-00-100-0175
NSN 6220-01-546-6371
NSN 5895-01-288-9007
NSN 6135-01-150-6916
NSN 6320-01-288-4783
NSN 5835-01-046-9615
NSN 5975-00-449-1209
NSN 5998-01-575-1477
NSN 6145-00-832-5323
NSN 5975-00-153-0050
NSN 6135-01-255-9129