To find a specific tolerance value, users follow a multi-step process often detailed in reference PDFs: Identify Material : Determine the specific plastic being molded. Determine Category : Look up the material in a provided table to find its Tolerance Category based on shrinkage. Select Tolerance Grade
If your general tolerance block references "ISO 20457 – m", you do not need to write individual tolerances on every dimension. The machinist knows to adhere to the Medium tolerance table. iso 20457 tolerance table pdf
