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 6240-01-321-3116
NSN 5965-01-240-0233
NSN 6150-01-106-3293
NSN 5998-01-188-6234
NSN 5930-00-278-7731
NSN 6240-00-146-9322
NSN 7035-01-428-2336
NSN 5910-01-361-8623
NSN 6650-00-035-9297
NSN 5935-00-378-0948
NSN 5975-01-415-4283
NSN 4140-01-487-8562