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 6145-01-432-2440
NSN 5990-00-020-1048
NSN 5990-00-277-3763
NSN 2925-01-233-8545
NSN 6240-00-209-1883
NSN 5855-01-649-9837
NSN 5910-01-271-0920
NSN 5895-01-490-1012
NSN 5996-00-186-8709
NSN 5855-01-035-2866
NSN 6145-00-135-1436
NSN 6320-00-701-0437