CHANCE (now Hubbell) has an Anchoring Encyclopedia on their website http://www.abchance.com/resources/li...ia/049401B.pdf
Here is a clip from page B-13 "Type RR (Round-Rod) anchors torque rating is 2,300 ft-lb.
Ultimate tension rating for RR mechanical strength is 70,000
lb. Failure to install within 5° of alignment with the guy load
will significantly lower strength."
And page B-47 had pictures of correct installations.