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 7035-00-312-3055
NSN 6320-00-701-0437
NSN 5905-01-610-9087
NSN 5990-00-518-2757
NSN 5925-01-362-0728
NSN 5965-01-036-1325
NSN 5975-01-650-1847
NSN 5915-01-555-9596
NSN 6135-01-110-9470
NSN 5985-01-421-2993
NSN 5990-00-518-0684
NSN 6135-01-320-4815