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 5985-00-195-5542
NSN 5975-01-028-1926
NSN 5910-01-173-1749
NSN 5975-00-471-3731
NSN 6645-01-290-1448
NSN 5945-00-276-9274
NSN 6240-01-654-7974
NSN 6240-01-195-0243
NSN 5925-01-105-8507
NSN 5925-01-348-4223
NSN 4140-01-475-8930
NSN 5910-01-448-2709