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 5935-00-705-6051
NSN 6130-01-522-2774
NSN 5915-01-364-1208
NSN 5998-00-265-1001
NSN 5999-01-447-3153
NSN 6650-01-264-7227
NSN 6135-01-416-3181
NSN 5990-01-374-3877
NSN 6685-00-191-9357
NSN 5915-01-385-1044
NSN 5996-01-578-8491
NSN 6685-01-630-2601