Choosing the right TG depends on the material's shrinkage behavior and the part's functional requirements.
– Plastics — Tolerances for moulded parts – is an international standard that specifies a system of tolerances for the general dimensions of injection-moulded and compression-moulded plastic parts. It replaces the now-withdrawn national standards such as DIN 16901 (Germany) and provides a globally harmonized approach. iso 20457 tolerance table pdf
To properly use an ISO 20457 tolerance table, design documentation must specify: Choosing the right TG depends on the material's
ISO 20457 also provides general geometrical tolerance tables. For example: To properly use an ISO 20457 tolerance table,
Note: This table is a representative summary. The official ISO 20457 PDF contains exact values and footnotes regarding chamfers, radii, and external/internal dimensions.
As we move toward Industry 4.0 and Model-Based Definition (MBD), the is evolving into a machine-readable format. Future revisions may come as XML or JSON files that CAD systems read automatically. However, for the next decade, the PDF will remain the universal backup—the human-readable master key.