Plum coupling turning, milling, broaching and other machining methods processed, and then after the whole heat treatment. To ensure adequate mechanical strength, there is a claw plate castings, high-volume production, and eliminating the need for processing losses. Than machining, so the price is much lower, but the casting performance is not very good. Is best not to use in a number of important occasions. And casting claw tooth at high speed or high load conditions prone to a tooth (claw and tooth loss).