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 7035-01-094-2365
NSN 6220-01-560-6009
NSN 5985-01-328-4761
NSN 6130-01-304-4431
NSN 6320-01-578-6006
NSN 6620-01-151-8113
NSN 7035-00-193-2269
NSN 5990-00-283-1324
NSN 5960-00-987-1897
NSN 6620-00-740-3699
NSN 6620-00-766-1002
NSN 5996-01-253-8676