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 6685-00-079-3307
NSN 5985-01-310-8473
NSN 6220-01-495-1433
NSN 5925-01-409-2616
NSN 6105-01-225-2517
NSN 5950-01-284-4130
NSN 6610-00-460-1419
NSN 5965-00-801-1131
NSN 5998-01-600-8022
NSN 5910-00-189-4639
NSN 5920-00-147-3164
NSN 4140-00-144-6833