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 5915-01-431-9235
NSN 5990-01-144-6994
NSN 6620-00-461-4934
NSN 5915-01-346-4987
NSN 6220-01-025-1373
NSN 5835-01-651-8807
NSN 5855-01-599-6143
NSN 5960-01-495-0859
NSN 6650-01-291-5024
NSN 5935-01-528-5668
NSN 6645-01-421-2445
NSN 6220-01-495-0916