Do not default to PT1. Interview your injection moulder first. Ask:
Using the official document ensures that the data you are using is up-to-date, as standards are periodically reviewed and updated to reflect new technologies and industry practices.
If your company still uses DIN 16901 or a custom “shop standard,” transitioning to ISO 20457 reduces confusion with international suppliers. iso 20457 tolerance table pdf
Simply stating "ISO 20457" on a drawing is insufficient. For a tolerance to be enforceable, the design documentation must include:
Note: Actual values in the official standard vary by material (e.g., glass-filled, amorphous, crystalline). The above is an illustrative summary. Do not default to PT1
This article explores the scope of ISO 20457, the importance of its tolerance tables, and how to interpret the data found within these essential documents.
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: If your company still uses DIN 16901 or
Understanding the ISO 20457 Tolerance Table The standard, which officially replaced the older German standard DIN 16742 , is the global benchmark for specifying dimensional and geometrical tolerances of plastic molded parts .
No account yet?
Create an Account