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 4140-01-587-5770
NSN 5998-00-312-1409
NSN 5996-00-983-2664
NSN 5905-00-581-2508
NSN 6620-00-140-8644
NSN 6240-01-461-4429
NSN 5905-00-363-3590
NSN 6645-01-481-9834
NSN 5915-00-025-1763
NSN 5855-01-406-7237
NSN 5910-01-013-4555
NSN 5999-00-148-4559