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 6135-00-485-7402
NSN 4140-00-575-6586
NSN 5985-01-213-7474
NSN 5998-01-547-3825
NSN 6685-00-735-4586
NSN 6150-00-221-2593
NSN 5925-00-736-0425
NSN 5965-00-605-8239
NSN 5930-00-982-6852
NSN 5996-01-633-7979
NSN 5920-01-566-1747
NSN 6685-01-168-7712