ISO 20457 categorizes tolerances into two distinct application groups based on whether the dimensions are tool-dependent or affected by post-molding assembly processes: 1. Series NW (Non-Tool-Dependent / Assembly Tolerances)
The standard helps engineers and manufacturers align on realistic dimensional expectations, preventing the over-specification of tight tolerances that unnecessarily drive up tooling and production costs. 2. Key Factors Determining Plastic Tolerances
In the world of manufacturing and mechanical engineering, precision is not just a goal—it is a language. When two parts from different suppliers in different countries must fit together perfectly, engineers rely on a standardized vocabulary of tolerances. One of the most critical, yet often overlooked, documents in this domain is . iso 20457 tolerance table pdf
Ultimate Guide to ISO 20457 Tolerance Tables for Plastic Molded Parts
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For flatness, ISO 20457 provides standard tolerances based on overall part dimensions:
Many commercial standards retailers provide document previews showing the table of contents before purchase. Ultimate Guide to ISO 20457 Tolerance Tables for
Wider tolerance bands are required due to potential warpage and shrinkage variations. Comparison with ISO 286 The standard correlates its Tolerance Groups (TG) International Tolerance (IT) grades defined in
