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 5945-01-163-0688
NSN 6685-00-838-7429
NSN 6110-00-099-7113
NSN 5915-01-100-8523
NSN 5910-00-147-2885
NSN 6145-00-181-9622
NSN 6220-01-517-9338
NSN 6220-00-152-7114
NSN 5835-00-484-1529
NSN 6110-01-482-0337
NSN 5915-01-459-7276
NSN 6320-00-831-2227