Iso 20457 Tg5 Jun 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?

represents a specific accuracy class used to define allowable dimensional deviations based on the material properties and manufacturing process. Understanding ISO 20457 TG5 ISO 20457 (which succeeded Iso 20457 Tg5

: To enforce a TG5 callout, the technical drawing must include: Acceptance Temperature : Standard is typically 23°C. Measurement Humidity : Often 50% relative humidity. Datum System refers to a specific "Tolerance Group" (TG) within

For TG5 to remain valid, parts must be measured under standard conditions (typically 23°C and specific humidity) to account for thermal expansion and secondary crystallization. Why Designers Choose TG5 represents a specific accuracy class used to define

: For a deep dive into how these grades are applied in practice, Makrolar provides a comprehensive PDF guide on tolerancing for plastic moulded parts according to ISO 20457.

The tolerance grade within the ISO 20457:2018 standard is a medium-to-tight precision classification used primarily for housing parts and functional components in plastic injection molding.

Are you looking to verify if a on your part meets the TG5 standard based on its nominal size? TOLERANCES