The suggested resources for the worm are hardened steel and bronze for the worm equipment. Nonetheless, based on the software, unhardened steel worms can operate adequately and much more economically on cast iron worm gears rated at fifty%. In addition to steel and hardened metal, worms are available in stainless metal, aluminum, bronze, and nylon worm gears are available in steel, hardened metal, stainless steel, aluminum, nylon, and non-metallic (phenolic).