... /shaftWe are specialist in manufacturing of Rocker Arm Assemblies for all type of engines as for Truck, Tractor, Car, Motorcycle, Diesel & Petrol ... Shaft, Rocker Screw, Spring & Circlip All of our Rocker Arm Assemblies are manufactured with most precision tooling & advanced techniques and from ... 58-60 HRC after heat treatment. Further, the hardness for the depth reaches 38-45 HRC. The working face is ...