The advisable materials for the worm are hardened metal and bronze for the worm gear. Nevertheless, relying on the software, unhardened steel worms can operate adequately and a lot more economically on solid iron worm gears rated at 50%. In addition to metal and hardened steel, worms are obtainable in stainless steel, aluminum, bronze, and nylon worm gears are available in steel, hardened metal, stainless steel, aluminum, nylon, and non-metallic (phenolic).