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 5945-01-531-3084
NSN 5945-01-048-3780
NSN 6135-01-366-9633
NSN 5960-01-503-0362
NSN 5960-01-357-1261
NSN 5935-00-851-7175
NSN 4140-01-409-0824
NSN 5895-00-815-7905
NSN 6105-01-176-9662
NSN 5895-01-137-6658
NSN 6610-01-542-2276
NSN 5975-01-105-6822