A typical tolerance table in this standard will include:
One of the distinctive features of ISO 20457 is its use of surface profile tolerance within a specified datum system. This approach allows for comprehensive control over the entire surface form of the molded part, rather than piecemeal control of individual features. General tolerances are applied with surface profile tolerance linked to a defined datum reference frame, ensuring consistency across all integral features.
Used for large components, highly flexible elastomers, or recycled materials where structural integrity takes precedence over strict dimensional accuracy. Material Properties and Tolerance Determination iso 20457 tolerance table pdf
: A detailed 4-page overview of ISO 20457 and DIN 16742 including classification tables.
A real-world example from manufacturing partners clearly illustrates this system. For standard injection molding projects, if a technical drawing does not specify tolerances, industry practice often defaults to the tolerance class. The actual tolerance values vary with size, highlighting the practical application of the standard. For instance, for mold-related ("B") dimensions, the tolerance might be ±0.03 mm for small features up to 3 mm, increasing to ±0.20 mm for larger features over 400 mm. A typical tolerance table in this standard will
: Materials are categorized (typically Categories 1–4) based on their shrinkage properties. Precision Classes Class A (High Precision)
ISO 20457 (and its German equivalent DIN 16742) is the definitive global standard for manufacturing tolerances and acceptance conditions of plastic molded parts Used for large components, highly flexible elastomers, or
is the definitive international standard governing geometrical and dimensional tolerances for plastic molded parts . Developed to replace older national benchmarks like the German DIN 16742 , this standard provides engineers, mold designers, and quality inspectors with a unified framework to establish realistic manufacturing limits. Unlike metals, plastics undergo complex material shrinkage, environmental expansion, and viscoelastic behavior. Applying standard metal tolerancing to injection-molded polymers inevitably leads to inflated tooling costs and high scrap rates.
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