The ASTM A615 grade is a rebar specification for concrete reinforcement and makes no mention of being used as an anchor bolt in any ACI, AISC or ASTM specifications that we are aware of.  Not to say that A615 rebar cannot be used as an anchor rod, however there would be some difficulties in doing this, such as the threading.  The main issue is that rebar cannot simply be threaded as is due to the diameter difference between the major diameter of UNC threads and the diameter inside the deformations.  There are ways around this, but often times it is recommended to consider the ASTM F1554 grade when specifying anchor rods, before considering rebar.  Before ordering anchor bolts as rebar, contact us and we can discuss your requirements.