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 5835-01-373-9506
NSN 5965-00-445-1843
NSN 4140-00-025-3474
NSN 5905-01-386-7559
NSN 5895-01-630-5811
NSN 6110-01-512-9520
NSN 7035-01-294-2688
NSN 5925-00-057-6762
NSN 5996-01-304-1088
NSN 6620-01-371-5040
NSN 5960-01-016-3334
NSN 6145-01-511-9871