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 5985-00-138-5847
NSN 5975-01-272-6182
NSN 6610-00-117-7647
NSN 5990-01-503-0194
NSN 5950-01-012-1652
NSN 5915-01-303-8008
NSN 6650-01-493-6638
NSN 5905-00-246-5994
NSN 6650-00-103-3239
NSN 6650-01-545-5672
NSN 5910-01-272-3801
NSN 6650-01-069-8211