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 6220-01-475-7687
NSN 5945-01-534-6123
NSN 6150-01-011-3428
NSN 6150-01-519-2544
NSN 4140-00-100-4563
NSN 5920-00-487-4256
NSN 6320-01-564-0893
NSN 6240-00-526-0243
NSN 6110-01-498-3929
NSN 5975-00-952-0890
NSN 6150-01-056-1324
NSN 5920-00-257-2950