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 6220-01-547-6448
NSN 6240-01-608-3269
NSN 5920-01-173-4108
NSN 6685-01-115-6534
NSN 5935-01-451-0521
NSN 5925-00-177-4654
NSN 5915-01-105-1652
NSN 5960-01-528-1147
NSN 6685-01-131-2812
NSN 5960-01-573-6483
NSN 5985-00-406-4137
NSN 5985-00-270-1694