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 5930-01-558-8190
NSN 5975-01-303-8374
NSN 5960-01-185-4216
NSN 5998-01-414-1871
NSN 5905-01-577-0026
NSN 5910-01-123-8483
NSN 5855-00-586-6255
NSN 5925-01-014-9858
NSN 5835-00-023-0780
NSN 6610-00-242-3160
NSN 6145-01-143-2868
NSN 5930-01-616-4637