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 6145-01-111-9553
NSN 7035-01-119-6271
NSN 6645-01-228-2127
NSN 5965-00-539-7778
NSN 6135-01-260-7180
NSN 6620-01-633-8443
NSN 7035-00-497-8784
NSN 5990-00-162-7273
NSN 6645-01-615-1052
NSN 5975-01-503-6459
NSN 5998-00-341-9854
NSN 5960-01-320-7675