For precision requirements (e.g., bearing bosses, mating surfaces), individual GD&T notes must override the default.
Unlike metal machining tolerances (which are largely linear), plastic cooling involves volumetric shrinkage, anisotropic orientation, and thermal contractions. DIN 16742 accounts for these complexities by categorizing production factors into ranging from TG1 to TG9. Deconstructing the TG5 Classification
Small features (under 1mm) might have a tolerance of ±0.05mm.
TG5 accounts for the shrinkage rates of common materials like PC (Polycarbonate) or PA (Polyamide), ensuring the final part meets its nominal dimensions after cooling. din 16742 - tg5
For many manufacturers, TG5 is the default starting point. If a design requires tighter tolerances (TG4 or higher), production costs usually increase due to stricter process monitoring and potential tool modifications. Key Factors in DIN 16742
Achieving TG5 requires specialized tooling engineering, stable processing conditions, and high-quality resin selection. Factors Influencing DIN 16742 TG5 Tolerances
Dimensional tolerances depend on the (mm) of the feature. Below is a simplified table for TG5 (based on DIN 16742, general tolerances for non-critical dimensions): For precision requirements (e
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represents the standard commercial accuracy tier for a vast array of technical plastic parts. It balances high-quality functional repeatability with cost-effective manufacturing constraints. Designing a part to meet TG5 specifications implies that the component requires strict dimensional control to ensure proper assembly or mechanism function, but stops short of requiring hyper-expensive ultra-precision tooling. 3. Dimensional Breakdown of TG5 Tolerances
Tolerances scale progressively from
DIN 16742 is a German standard for tolerance analysis and calculation in engineering design. TG5 refers to a specific part of this standard, which deals with the calculation of tolerances for geometric dimensions. This feature provides a comprehensive solution for engineers to perform tolerance analysis and calculation according to DIN 16742 - TG5.
is a specific accuracy class within this standard. In the hierarchy of tolerance groups (TG1–TG9), TG5 is considered a "precise" or "standard precision" class for high-quality injection moulding.
Under DIN 16742, tolerances aren't a single flat number. They depend on the of the part. For a TG5 part: If a design requires tighter tolerances (TG4 or