| Feature | ISO 20457 | DIN 16901 | | :--- | :--- | :--- | | | International Standard (ISO) | German National Standard (DIN) | | Tolerance Grades | 9 grades (TG1–TG9) | 6 groups (110–160) | | Current Status | ACTIVE | SUPERSEDED (by ISO 20457) |
Best Practices for Specifying ISO 20457 on Engineering Drawings iso 20457 tolerance table pdf
which includes the first few pages and Table 8 (General Tolerances). Detailed Overviews | Feature | ISO 20457 | DIN 16901
Higher shrinkage materials require wider tolerances; a 100 mm dimension in polypropylene (SG3, shrinkage 1.5%–2.0%) will have a wider tolerance than the same dimension in ABS (SG1, shrinkage below 0.5%). Consult with your manufacturing partner to ensure the
Begin by specifying the required tolerance grade (TG1 through TG9) based on the part’s functional requirements. Consult with your manufacturing partner to ensure the chosen grade is economically achievable. Excessively tight tolerances can increase tooling costs by 50–100% and extend lead times significantly.