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 5990-01-294-6198
NSN 5985-01-236-8999
NSN 5910-01-054-3442
NSN 5965-01-501-5638
NSN 6610-01-444-4001
NSN 6650-01-555-6661
NSN 6145-01-613-7370
NSN 5835-01-475-5714
NSN 6110-00-053-9986
NSN 5985-00-232-0692
NSN 5835-01-083-1077
NSN 5985-01-361-6122