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 5920-01-101-5745
NSN 5965-01-356-2047
NSN 4140-01-528-0725
NSN 6645-01-152-1092
NSN 5996-00-068-8585
NSN 6320-01-422-1212
NSN 5910-00-126-9608
NSN 5999-01-050-6018
NSN 5895-01-380-9949
NSN 5999-01-442-5446
NSN 4140-01-616-2705
NSN 5910-00-405-7914