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 7035-01-432-2424
NSN 5910-01-042-8857
NSN 6135-01-572-7548
NSN 6105-01-515-9858
NSN 5895-00-839-3113
NSN 6220-00-620-7563
NSN 2925-00-778-0645
NSN 5996-01-387-3414
NSN 5910-00-761-1251
NSN 6320-01-137-4714
NSN 6240-00-982-6748
NSN 6110-01-021-4070