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 6620-01-315-1159
NSN 5920-01-258-6360
NSN 6135-01-495-0933
NSN 6685-00-246-5349
NSN 5985-01-259-4314
NSN 5925-00-074-9180
NSN 6620-01-441-0240
NSN 2925-00-309-4884
NSN 6135-01-458-7476
NSN 7035-01-608-3619
NSN 6105-01-445-4574
NSN 6320-01-185-3857