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 5855-01-291-6790
NSN 6610-01-517-1901
NSN 5935-01-634-0668
NSN 5925-01-377-9859
NSN 6610-00-319-4022
NSN 5855-00-149-0766
NSN 5895-01-593-4842
NSN 5915-01-015-8849
NSN 5975-01-030-5745
NSN 5910-01-500-4594
NSN 5999-01-180-9754
NSN 6610-00-336-2404