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 4140-01-331-9281
NSN 6620-01-569-4621
NSN 5999-00-151-7264
NSN 5915-00-126-5062
NSN 5990-00-145-1187
NSN 5960-00-346-7902
NSN 6135-01-215-1245
NSN 5930-01-643-6003
NSN 6130-01-004-3566
NSN 7035-01-578-6909
NSN 6105-00-196-4957
NSN 7035-01-533-9137