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):
Let’s break down what ISO 20457 really is, and where to get the correct tolerance information for your drawings. iso 20457 tolerance table pdf
Key Formula Logic: The tolerance ($t$) is often calculated as a percentage of the wall thickness with a minimum limit. For example: $$ t = 0.1 \times e_n + 0.2 \text mm (simplified example) $$ Key Formula Logic: The tolerance ($t$) is often
Specifying functionally required tolerances based on polymer behavior. Toolmakers Agreeing on shrinkage compensation and tool contour limits. Quality Engineers Applying acceptance criteria in production control plans. Tolerance Group (TG) table breakdown for a particular nominal dimension range? TOLERANCES including: ranging from TG1 to TG10.
Download ISO 20457 Tolerance Table PDF: You can download the ISO 20457 tolerance table PDF from various sources, including:
ranging from TG1 to TG10. These groups are further divided into based on production effort: Series 1 (Standard Production):
: High-shrinkage materials (like POM or PA6) typically require larger tolerance values compared to low-shrinkage materials (like ABS or PC). OKW Gehäusesysteme Reference Documents & PDF Guides