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 6645-01-023-8020
NSN 5895-01-226-1144
NSN 5835-01-170-0271
NSN 5960-01-553-4557
NSN 5965-01-077-3346
NSN 6620-01-417-8110
NSN 6685-01-630-5459
NSN 6685-00-416-2900
NSN 5998-01-543-6226
NSN 5960-00-481-4034
NSN 5910-01-474-1123
NSN 5950-01-100-0915