Iso 20457 Tolerance Table Pdf Jun 2026

Note: This table represents general dimensional tolerances. For exact allocations based on specific compound shrinkage rates and tool-bound vs. non-tool-bound dimensions, please reference the official ISO 20457 PDF framework. 5. Tool-Bound vs. Non-Tool-Bound Dimensions

A key concept within the ISO 20457 PDF is the distinction between two types of dimensions:

What or resin blend are you using?

This article breaks down how the ISO 20457 tolerance table works, how to determine tolerance groups, and how to apply these metrics to your manufacturing PDF blueprints. What is ISO 20457?

If your general tolerance block references "ISO 20457 – m", you do not need to write individual tolerances on every dimension. The machinist knows to adhere to the Medium tolerance table. iso 20457 tolerance table pdf

Coarse molding; used for highly flexible, elastomeric materials or recycled resins with highly unpredictable shrinkage. Dimensional Tolerance Matrix (Reference Values)

Understanding dimensional tolerances for plastic injection molded parts is crucial for designers, engineers, and manufacturers. Unlike metals, plastics are sensitive to thermal expansion, moisture absorption, and molding process variations. (which supersedes DIN 16742) provides the standardized framework for these tolerances, replacing older, less applicable metal-based standards. Note: This table represents general dimensional tolerances

Tolerances that are too strict (e.g., trying to achieve TG3 on a complex, amorphous plastic part) can dramatically increase manufacturing costs by requiring more precise, expensive tooling and longer cycle times.