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 5925-01-012-3624
NSN 5930-00-205-2945
NSN 5930-00-646-4360
NSN 6650-00-400-4977
NSN 6220-00-160-1298
NSN 6135-01-581-8163
NSN 5910-00-492-8628
NSN 5965-00-763-8015
NSN 5990-01-493-4039
NSN 5990-01-503-8455
NSN 5998-01-130-8106
NSN 2925-01-625-6841