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 5855-01-538-3743
NSN 5920-01-325-8842
NSN 5950-01-359-1931
NSN 5915-00-688-9124
NSN 6145-01-115-6642
NSN 5915-00-888-4379
NSN 5945-00-639-9848
NSN 6130-00-692-2916
NSN 4140-01-235-1757
NSN 5990-01-539-4653
NSN 5965-00-436-2226
NSN 5965-01-399-6071