DIN 16742 is a critical German standard that defines tolerances and dimensions for molded plastic parts. In the field of injection molding and polymer engineering, achieving exact dimensions is challenging due to material shrinkage, warpage, and process variations. DIN 16742 provides a systematic framework for designers and manufacturers to agree on acceptable dimensional deviations.
Larger features (over 100mm) might have a tolerance exceeding ±0.30mm. din 16742 - tg5
The feature regarding DIN 16742 TG5 refers specifically to the tolerance grade for thermoplastics injection molded parts. TG1 (Very Coarse) TG2 (Coarse) TG3 (Medium) TG4
production level. It is tighter than the standard TG6 but less extreme than the tool-room limits of TG3 or TG4. Application din 16742 - tg5
To determine if TG5 is appropriate for a part, engineers should conduct a tolerance analysis:
: It eliminates the need for redundant "habitual tolerances" on drawings by providing a generalized table for linear and angular dimensions. Process Specificity : The standard distinguishes between mold-fixed dimensions (formed by a single mold part) and non-mold-fixed dimensions
In the world of injection-molded plastic components, a frequent source of friction between designers and manufacturers is surface quality. Designers demand "perfect" parts, while production managers speak in microns and shrinkage rates. The German standard DIN 16742 bridges this gap. At its peak sits TG5—the highest tolerance grade for surface finish and geometry.