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 6145-00-170-4044
NSN 7035-00-535-8109
NSN 6645-01-548-3934
NSN 5925-00-204-6609
NSN 6620-00-581-8984
NSN 6240-01-585-2223
NSN 6620-00-500-0041
NSN 5965-01-399-8454
NSN 7035-01-266-3490
NSN 5990-01-504-9265
NSN 7035-01-649-8977
NSN 6320-01-466-4175