I posted mine as 9/16-16. I'm not up on the correct syntax for bolt identifications.
Mike
Bolts are identified by their thread diameter and pitch, and length from the bottom of the head to the end of the bolt; i.e., 3/8"-16 x 1-1/4". Standard 3/8" bolts have a 9/16" hex head, but that's not used in describing the bolt.