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 5960-01-056-6705
NSN 6645-01-632-9074
NSN 5855-01-400-1590
NSN 6650-00-736-8456
NSN 5965-01-050-8447
NSN 5985-00-063-2726
NSN 6320-00-186-6452
NSN 6320-00-908-6841
NSN 5835-00-665-3395
NSN 6135-00-676-5807
NSN 7035-01-189-1549
NSN 6130-01-339-8011