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 5950-01-349-7244
NSN 5920-01-515-4191
NSN 6610-00-584-5055
NSN 6150-01-147-4604
NSN 6110-00-141-1966
NSN 5960-01-367-0981
NSN 6240-01-570-3066
NSN 6150-01-578-6786
NSN 5925-01-425-7068
NSN 6610-00-639-3615
NSN 5930-00-498-5191
NSN 5999-00-717-3101