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 5960-00-736-0213
NSN 5950-01-427-3723
NSN 6620-01-177-5567
NSN 5910-00-924-2100
NSN 5990-00-394-3987
NSN 5835-00-257-2852
NSN 5910-01-482-9449
NSN 6145-01-444-0812
NSN 5935-01-298-8922
NSN 5920-01-231-8520
NSN 6610-01-152-1463
NSN 5998-01-600-3261