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 5985-01-111-8488
NSN 5835-00-611-0607
NSN 5965-01-304-1718
NSN 5975-00-093-7731
NSN 5960-01-351-5074
NSN 5925-01-560-1047
NSN 6240-01-429-9002
NSN 5965-01-442-7364
NSN 5998-00-924-6550
NSN 5925-01-295-8445
NSN 5895-01-572-7359
NSN 6135-00-416-2898