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 5935-01-613-3861
NSN 5835-01-536-6241
NSN 5925-00-834-0272
NSN 5985-00-420-5710
NSN 6685-01-655-5146
NSN 6685-01-004-1888
NSN 5915-01-539-7634
NSN 6620-01-443-3526
NSN 5996-00-135-5756
NSN 5996-00-977-1101
NSN 5975-01-122-9278
NSN 5960-00-131-1218