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 4140-01-009-9951
NSN 6150-01-499-0999
NSN 6320-01-220-2264
NSN 5996-00-911-6625
NSN 5999-00-022-4881
NSN 5945-00-599-2230
NSN 7035-01-254-3044
NSN 2925-00-724-1317
NSN 6110-00-770-1838
NSN 7035-01-284-5043
NSN 5835-01-408-6529
NSN 5910-01-512-8201