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 5895-00-233-5901
NSN 5910-00-001-4685
NSN 5975-01-113-7397
NSN 6135-01-623-9063
NSN 5905-01-206-7163
NSN 5999-01-274-6273
NSN 5985-00-473-2161
NSN 2925-00-934-8383
NSN 5910-00-247-2075
NSN 5935-01-383-6991
NSN 5996-01-459-8014
NSN 7035-01-528-7870