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 6685-00-276-9889
NSN 6145-01-414-3729
NSN 6135-01-598-9890
NSN 5998-01-322-7979
NSN 4140-01-323-3661
NSN 6240-01-170-3491
NSN 6145-01-170-4658
NSN 6240-01-522-2070
NSN 6110-00-733-8686
NSN 6620-00-127-0816
NSN 6240-01-291-4833
NSN 6105-01-218-3699