Choosing the right TG depends on the material's shrinkage behavior and the part's functional requirements.
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
When reviewing a , ensure you are referencing the correct: Choosing the right TG depends on the material's
Even with the in hand, engineers frequently misapply it: When reviewing a , ensure you are referencing
Compare this to ISO 286 for metal (IT7 grade for 100–200 mm: about ±0.035 mm). The plastic tolerance is nearly 10x wider. This illustrates the core lesson of ISO 20457:
Values are approximate based on standard industry applications of ISO 20457/DIN 16742 .
So any PDF that claims to be a universal “ISO 20457 tolerance table” is likely a simplified summary from a textbook or company standard.