The advised resources for the worm are hardened metal and bronze for the worm equipment. Nevertheless, dependent on the application, unhardened metal worms can operate sufficiently and much more economically on solid iron worm gears rated at fifty%. In addition to steel and hardened steel, worms are offered in stainless metal, aluminum, bronze, and nylon worm gears are offered in metal, hardened metal, stainless metal, aluminum, nylon, and non-metallic (phenolic).

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