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 6645-00-641-3202
NSN 5920-01-422-1445
NSN 6650-01-412-8471
NSN 5905-01-281-5819
NSN 6220-01-541-7094
NSN 5910-00-156-7293
NSN 6135-00-334-4500
NSN 5990-01-185-9835
NSN 5960-01-201-5804
NSN 6110-01-322-7778
NSN 5920-01-511-6441
NSN 5985-01-281-7333