If you truly need a working reference without paying for the full standard, these sources offer legally compliant extracts:
By using the ISO 20457 tolerance table, engineers and manufacturers can:
Transitioning from metal design to plastic injection molding requires a shift in how you approach tolerances. Utilizing ISO 20457 ensures that your production team, mold maker, and quality control inspectors are operating under the same realistic, globally accepted baseline.
Before ISO 20457, many engineers relied on standards like Germany's to tolerance their plastic components. While useful, DIN 16901 was a national standard that lacked the global recognition needed for international trade. iso 20457 tolerance table pdf
Licensed engineering document distributors (like IHS Markit or Techstreet) Conclusion
Note: Unlike outside diameters, wall thickness usually has bilateral tolerances ($\pm$).
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. If you truly need a working reference without
Online technical documentation platforms like IHS Markit or SAI Global.
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Whether you are a veteran designer or new to plastic part manufacturing, gaining a thorough understanding of and access to the ISO 20457 tolerance table PDF is not just a best practice—it is a necessity for modern, competitive manufacturing. While useful, DIN 16901 was a national standard
Unlike metals, plastic dimensions are highly dynamic. ISO 20457 determines tolerance groups based on four major variables:
The standard defines 10 Tolerance Groups, labeled .