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 6620-01-144-8609
NSN 5895-00-367-4282
NSN 5915-01-149-7002
NSN 5985-01-489-7056
NSN 5960-00-418-2474
NSN 6645-01-505-3839
NSN 6620-00-041-3406
NSN 6240-01-576-9580
NSN 6135-01-655-1759
NSN 6650-01-591-3342
NSN 5965-01-626-9791
NSN 6240-01-069-9022