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 5985-01-313-8891
NSN 5935-01-089-9981
NSN 5945-00-775-4098
NSN 5998-00-260-1179
NSN 5945-01-582-7066
NSN 5925-01-216-3573
NSN 6685-00-173-3848
NSN 5985-01-605-2470
NSN 6610-01-145-2569
NSN 5990-00-929-3216
NSN 6685-00-682-0907
NSN 6110-00-684-6844