Din 16742 - Tg5 ((install)) Now
If parts do not fully comply with the specified general tolerances, they do as long as their function is not impaired. This functional approach to acceptance conditions prevents unnecessary scrapping of parts that are fit for use.
Understanding DIN 16742 TG5: The Standard for Plastic Molding Tolerances
The following table provides an overview of the permissible limit deviations for in accordance with DIN 16742-TG5:
Within this standard, represents a highly specific, precision-oriented tier. This comprehensive guide breaks down the technical foundations of DIN 16742, explores the exact parameters of the TG5 classification, and outlines how engineers can successfully achieve these tight tolerances. 1. What is DIN 16742? din 16742 - tg5
(affected by the movement of mold components), allowing for more realistic tolerance expectations based on tool mechanics. Supply Chain Alignment : Particularly in the European and German automotive supply chains
Achieving TG5 requires a "capable" process. This means the manufacturer must use high-quality tooling and maintain tight control over the injection molding parameters.
| Feature | TG4 (Fine) | TG5 (Very Fine / Precision) | | :--- | :--- | :--- | | | Standard precision | High precision | | Mold cost | Moderate | High (requires hardened steel, 3+ slides) | | Typical application | Snap-fits, enclosures | Gears, bearings, optical housings | | Process window | Wide | Very narrow (requires dry resin, controlled environment) | If parts do not fully comply with the
If you design a TG5 part, you must also design a TG5 mold (hardened steel, hot runner, 4+ cooling circuits) and accept a 15–20% part price premium over TG3. If your assembly allows a 0.5 mm gap or a visible witness line, drop the requirement to TG3 and save your budget.
DIN 16742 TG5 differentiates between two types of dimensions, assigning separate tolerance values to each:
Represents high-precision industrial molding . It is the boundary line where standard production practices meet advanced engineering. Achieving TG5 requires strict optimization of process controls, high-quality mold construction, and premium-grade resins. (affected by the movement of mold components), allowing
To hit TG5, the injection mold tool must be constructed to high accuracy standards.
: Structural foam molding, thick-walled parts, or highly semi-crystalline materials susceptible to severe, unpredictable shrinkage. Tool-Fixed vs. Non-Tool-Fixed Dimensions
Understanding how TG5 relates to other common tolerance specifications is important:
In DIN 16742, Tolerance Groups dictate how strictly a dimension must be controlled. The scale runs from TG1 (extremely loose, commercial tolerances) to TG9 (ultra-precise, rarely achievable tolerances).
Reserved for extreme or high-precision parts (e.g., medical connectors or aerospace components).
