The "Tolerance Table" referenced in ISO 20457 is not just a single chart; it is a system based on mathematical formulas that generate tolerance values based on the nominal dimension.
ISO 20457 places heavy emphasis on injection molded fittings. The tolerances here are tighter than for pipes because molds are machined to high precision. iso 20457 tolerance table pdf
Do not default to PT1. Interview your injection moulder first. Ask: The "Tolerance Table" referenced in ISO 20457 is
Keep a legitimate copy of ISO 20457:2018 on your digital shelf, and you will never again guess whether a "±0.5mm" is appropriate for a 2-meter-long part. iso 20457 tolerance table pdf