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 5945-00-883-7291
NSN 5935-00-908-1515
NSN 6620-01-378-1366
NSN 6610-00-227-8846
NSN 5905-01-459-6402
NSN 6320-00-036-3688
NSN 6110-00-321-1271
NSN 6320-01-312-3620
NSN 6130-01-015-2608
NSN 5895-01-502-8948
NSN 5985-00-071-1401
NSN 5996-00-347-9859