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Keep a legitimate copy of ISO 20457:2018 on your digital shelf, and you will never again guess whether a "±0.5mm" is appropriate for a 2-meter-long part.
A common mistake in engineering is applying metal machining standards (such as ISO 2768) directly to plastic injection molding. This approach creates major manufacturing issues because plastic parts exhibit: Polymers shrink anywhere from as they cool inside the mold cavity.
Dimensions formed by a single, solid piece of the mold tool. These naturally have tighter tolerances because tool-wear is minimal. iso 20457 tolerance table pdf
ISO 20457 intentionally excludes certain surface imperfections such as sink marks, undesired flow structures, roughness, and joint lines. The standard is also not intended to replace any product-specific tolerance requirements found in other standards.
The accuracy of the mold cavity design and construction.
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Note: Unlike outside diameters, wall thickness usually has bilateral tolerances ($\pm$).
Standard engineering molding; typical for structural components using stable polymers (e.g., POM, PBT, PA66 with glass fibers). Medium to High
High-shrinkage raw polymers or flexible elastomeric components. The Structure of the ISO 20457 Tolerance Table Can’t copy the link right now
To help me tailor the recommendation, could you tell me a bit more about your project?
Decide if your application requires Precision (TG1-TG4) or General (TG5-TG8) manufacturing.