Iso 20457 Tg5 May 2026

refers to a specific "Tolerance Group" (TG) within the international standard for plastic molded parts. Specifically, TG5 is the baseline standard precision grade used for general-purpose industrial applications, such as housing parts and enclosures. What is ISO 20457?

For more detailed engineering data, you can view the official abstract on the ISO website or check the DIN ISO 20457 comprehensive guide .

The standard categorizes production accuracy into nine Tolerance Groups (TG1 to TG9): Iso 20457 Tg5

Specifying "ISO 20457 Tg5" on a drawing is not enough to be legally enforceable. According to technical guides , a complete specification must include: : e.g., TG5.

: Coarse to very coarse (e.g., packaging or parts with high, unpredictable shrinkage). Key Components of an ISO 20457 Callout refers to a specific "Tolerance Group" (TG) within

: Whether using a CMM (Coordinate Measuring Machine) or a manual fixture. Why Choose TG5?

: Standard Baseline Precision. This is the "default" for technical parts where fit and function are important but not microscopic. For more detailed engineering data, you can view

: The environmental state (typically 23°C and 50% relative humidity) at which the part must be measured. Datum Scheme : The reference points used for measurement.

: Extreme precision (expensive and difficult to maintain). TG4 : High precision (e.g., gears or precision wheels).