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 5975-00-553-7151
NSN 6150-00-027-1235
NSN 5855-01-257-2636
NSN 6135-01-168-2944
NSN 5960-01-466-4153
NSN 6610-00-028-2222
NSN 6145-00-216-6613
NSN 4140-01-061-5629
NSN 5945-01-293-0487
NSN 5910-01-325-7934
NSN 5910-00-465-4518
NSN 5985-00-470-1624