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 5895-00-221-1315
NSN 6135-01-177-3552
NSN 6145-00-397-0726
NSN 5965-01-477-1030
NSN 5965-00-081-9412
NSN 5915-01-589-4149
NSN 5985-01-521-3694
NSN 6135-00-995-1089
NSN 2925-00-149-0760
NSN 2925-00-371-2285
NSN 5996-00-626-3766
NSN 5960-01-444-8163