HEX" copper bonded earth rod are made from low carbon steel of grade BS 970 or AIS11018 with a high tensile strength of atleast 600 N/mm2 . Low carbon steel core are molecularly tended with 99.9% pure electrolytic copper. Salient Features Perfectly bonded rod will lost longer, drive easier and will not crack. Corrosion resistance while providing tee lowest resistance to ground. Threads are rolled by roll threading process, which ensures teat an wen copper covers is maintained, wen at the root of the thread. Roll thread gives greater strength than cut thread. Thread rolling process raises the surface of the rod, so teat Thread dia. (T) is greater than Shank dia. (S).