Materials used in plastic gears are, in general, engineering plastics such as polyacetal (POM) and MC Nylon which is essentially polyamid resin. In addition, U-PE and PEEK can be used.

When there is a large temperature fluctuation in the application environment, when the diameter is large or when there is load on its keyway, metal hub made of S45C or stainless steel may sometimes be used. In these cases, the teeth portion and the hub portion are attached together with screws. If it is not possible to screw together, two parts are fused together and made into fused gears. KHK’s fused gears are designed in such a way that the holding strength of the fused surface is stronger than the tooth strength.

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