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 2925-01-136-2551
NSN 6240-00-290-4185
NSN 5960-01-027-1835
NSN 6135-00-998-5884
NSN 5950-01-382-0636
NSN 5999-01-514-7832
NSN 6650-00-684-3060
NSN 6220-00-282-7916
NSN 6320-01-476-7702
NSN 5999-01-328-5884
NSN 5975-01-009-8152
NSN 7035-01-452-9086