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In order for gears to achieve their required performance, the
selection of a suitable material is important. Common choices include: Stainless Steel, Nylon, Steel, Acetal, Brass and PTFE. Ferrous metals are the most widely used for gears, offering high
strength and low cost. Cast iron, carbon
steels and alloy steels are in common use as well. Non-ferrous metals usually offer good machinability, light weight,
corrosion resistance and are non-magnetic. The commonly used
non-ferrous materials for gears are brass or bronze. Plastics are also
commonly used via injection molding.