ASTM F1554 provides guidance for the bend geometry for Grade 36, 55 and 105 anchor rods. I do not know where to find this information for stainless steel anchor rods. It is my experience that bends in anchor rods are much tighter than for similar size rebar. Also, hooked anchor rods do not develop as hooked rebar in concrete. I am recommending to our structural engineers that if you want to develop an anchor rod, it must have at least the same development length as a rebar of the same diameter.