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 5930-00-221-6570
NSN 5895-00-456-0830
NSN 7035-01-167-1052
NSN 5950-00-612-4041
NSN 6645-01-560-8271
NSN 5998-00-166-8135
NSN 5935-00-258-4199
NSN 5920-00-931-7979
NSN 5915-00-501-8579
NSN 5855-00-149-0766
NSN 5905-01-142-9730
NSN 5945-00-225-4125