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 5920-01-259-8616
NSN 5935-00-841-1228
NSN 6150-00-518-1402
NSN 6135-00-967-3112
NSN 6135-00-175-7132
NSN 5925-01-138-3292
NSN 6220-01-147-5320
NSN 6220-01-632-8217
NSN 5945-00-470-0082
NSN 5910-00-038-5436
NSN 6135-01-373-2518
NSN 6240-01-611-7193