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 6135-01-014-3144
NSN 5915-00-721-2204
NSN 5965-00-500-5826
NSN 6685-00-518-5977
NSN 5975-01-086-1626
NSN 6220-00-964-1042
NSN 6240-01-144-3864
NSN 6650-00-393-0447
NSN 6645-01-201-5802
NSN 5960-01-429-5897
NSN 5915-01-322-5342
NSN 5990-01-623-0082