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The advisable resources for the worm are hardened steel and bronze for the worm equipment. Even so, dependent on the application, unhardened metal worms can operate adequately and more economically on forged iron worm gears rated at 50%. In addition to metal and hardened steel, worms are obtainable in stainless metal, aluminum, bronze, and nylon worm gears are accessible in metal, hardened steel, stainless steel, aluminum, nylon, and non-metallic (phenolic).