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 5996-01-388-1275
NSN 5945-00-904-3729
NSN 6645-01-553-8500
NSN 6105-01-246-2210
NSN 5915-01-065-1127
NSN 6240-01-479-1410
NSN 6135-01-581-8163
NSN 5910-01-037-6851
NSN 6135-00-179-0538
NSN 5996-01-005-8930
NSN 5935-01-105-7958
NSN 6620-01-386-5543