If you truly need a working reference without paying for the full standard, these sources offer legally compliant extracts:
Always confirm that the table shows PT1 through PT7 and includes the separate columns for parting line (typically labelled “F” for “flash line” in German-influenced documents). iso 20457 tolerance table pdf
ISO 20457 provides the mathematical basis for dimensional control in the plastic piping industry. The tolerance tables are designed to balance manufacturing feasibility (allowing for shrinkage and molding variations) with functional requirements (ensuring leak-tight joints). If you truly need a working reference without
When reviewing a PDF of ISO 20457, ensure you are referencing the correct: Always confirm that the table shows PT1 through
Angles are treated differently because the deviation is measured as a length over a given length (mm/m) or directly in degrees/minutes.
| Tolerance Class | Permissible Deviation (mm per 100mm length) | | :--- | :--- | | Fine (f) | ± 0.3 mm/m | | Medium (m) | ± 0.5 mm/m | | Coarse (c) | ± 1.0 mm/m |
For shorter legs (< 10mm), the deviation is often given as a fixed value (e.g., ± 30 minutes for coarse, ± 10 minutes for fine).
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