(linear mm) FORM & POSITION: DIN 16742 TG5 SURFACE: V2
To prevent warping, ensure that wall thickness is uniform throughout the part.
Features formed by two halves of the mold (e.g., overall length, parting line measurements).TG5 provides smaller tolerance bands for both, but non-mold-fixed dimensions will always have higher tolerance values than mold-fixed ones due to parting line flash, venting gaps, and potential misalignment. When to Use DIN 16742 - TG5
The molder must design the steel mold to compensate for shrinkage. Under TG5, the allowed deviation from nominal shrinkage is tightly managed. For example, if the material datasheet says 0.5% shrinkage, the molder cannot let real shrinkage drift between 0.4% and 0.6%—TG5 forces a narrower band (e.g., 0.47%–0.53%). 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.
TG5 is widely used in conventional injection moulding and is often considered the for this process. It is also applied in other moulding processes such as:
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 (linear mm) FORM & POSITION: DIN 16742 TG5
DIN 16742 is a German standard (adopted internationally as ISO 20457) that defines general tolerances for plastic molded parts. Unlike metal parts, which can be specified using standardized fit systems, plastic parts require a unique system due to material behavior like shrinkage, warpage, and moisture absorption.
: Standards like DIN 16742 facilitate the interchangeability of tool holders across different machines and manufacturers. This not only offers flexibility in production planning but also helps in reducing inventory levels, as a standard tool holder can be used in various machines.
Initially specified TG5 for all dimensions. After mold flow analysis, only the pin grid array (PGA) zones were mapped to TG5. The outer shell was relaxed to TG4. Under TG5, the allowed deviation from nominal shrinkage
When designing or manufacturing plastic injection-molded components, controlling dimensional variations is a critical engineering challenge. Plastic materials shrink, warp, and behave differently than metals during production. To establish a standardized framework for these variations, the German Institute for Standardization developed .
It bridges the gap between general-purpose engineering parts (usually TG6) and high-precision technical components (TG4/TG3).