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 6220-00-160-9372
NSN 5855-01-125-9167
NSN 6685-01-076-4703
NSN 5895-01-334-7259
NSN 5945-01-282-6900
NSN 5905-01-085-1322
NSN 6110-01-263-8787
NSN 6110-01-117-5900
NSN 6650-01-197-4585
NSN 6110-00-205-1778
NSN 5920-00-074-4654
NSN 5998-01-367-0818