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 5996-00-342-9246
NSN 2925-01-424-0235
NSN 2925-01-577-0004
NSN 6110-01-512-9520
NSN 5930-00-186-0712
NSN 6650-01-578-0007
NSN 6150-01-309-0945
NSN 6610-01-151-7669
NSN 5960-01-234-4388
NSN 5985-00-397-7296
NSN 6145-00-824-2517
NSN 5935-01-514-7147