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 5935-01-380-2082
NSN 5855-01-035-2866
NSN 5985-01-398-8926
NSN 5910-01-275-0741
NSN 4140-01-100-1223
NSN 6685-01-412-1706
NSN 6110-01-364-8880
NSN 6610-00-120-1251
NSN 6135-01-231-4809
NSN 6685-00-813-7025
NSN 5945-01-204-6920
NSN 5935-01-132-9030