ISO 20457:2018 standard (often referenced alongside ) defines the tolerances and acceptance conditions for plastic molded parts. It replaces the older DIN 16742 standard to provide a global unified guide for designers and manufacturers to manage the unique dimensional, shape, and positional deviations inherent in polymer cooling and shrinkage. www.makrolar.eu Key Components of ISO 20457 Tolerance Groups (TG):
The tolerance tables are split based on what is being measured. The two most common tables you will encounter are: iso 20457 tolerance table pdf
Because ISO 20457 is a classification standard, its tables do not provide the raw numbers for every single dimension (that is the job of ISO 286, ISO 2768, etc.). Instead, it provides a . it provides a .