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Home Design Guidelines Plastics Plastic Component Design Plastic Injection Molding Part Tolerance

Plastic Injection Molding Part Tolerance

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Establishing tolerance with respect to product has significance importance on mold ability and cost. It is recommended to indicate only critical dimensions with tolerances on a drawing. Depending on application, a division into three tolerance class can be made:

Normal, Medium & Fine

Cost of manufacture for Medium Tolerance part  will be 1.7 times Normal toleranced part  and it will be 3 times for Fine toleranced part.

General molding tolerances are shown below

DimensionalTol_IMPlasticParts1
DimensionalTol_IMPlasticParts2