Worm shaft and worm wheel are important spare accessories of power transmission unit of automobiles or industrial equipment. Design of worm shaft includes a helical groove based cylindrical shaft which is connected to any drive source like motor. Worm wheel is basically a type of flat and circular shaped gear which is used along with worm shaft to form worm gear drive Teeth of worm wheel has spiral patterned design. Worm shaft and worm wheel are notable for their heavy duty look. These low maintenance spare parts have long life span.