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 6645-01-344-8702
NSN 6685-01-089-4789
NSN 5998-00-483-0608
NSN 5855-01-542-9059
NSN 5915-00-270-1076
NSN 5999-01-031-6665
NSN 5855-01-070-4072
NSN 6110-00-148-8536
NSN 5985-00-529-0093
NSN 6610-00-033-8097
NSN 6220-01-172-5300
NSN 5965-00-289-6280