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 6145-01-125-9071
NSN 6645-00-192-1152
NSN 5915-00-473-2112
NSN 5935-01-397-6429
NSN 6145-01-289-0732
NSN 5855-01-417-3250
NSN 6110-01-045-0399
NSN 5945-01-076-6550
NSN 5965-01-250-3214
NSN 5855-01-147-4785
NSN 6150-01-131-4859
NSN 6135-01-324-7718