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 5925-00-253-5137
NSN 6620-01-290-8209
NSN 5935-00-994-4224
NSN 4140-01-660-8337
NSN 5945-00-197-0108
NSN 5998-01-056-8451
NSN 6610-01-299-1713
NSN 5925-01-364-8334
NSN 5998-00-964-3227
NSN 5910-01-421-3964
NSN 6620-00-043-6082
NSN 5925-01-541-9251