Tolerances scale progressively from
To successfully produce parts in Series 3 or 4, the following conditions must be met:
. Thinner walls (as low as 0.7 mm for PBT) cool faster and can help maintain dimensional stability 4. Pro Tip: The "Steel Off" Strategy When aiming for TG5 accuracy on critical fitting features: Design it "Small":
DIN 16742 differentiates between two types of dimensions, which directly impacts how TG5 is applied: din 16742 - tg5
(Note: If the dimension crosses a parting line (NW), an additional structural tool tolerance must be added to these baselines.) 5. Industrial Applications of DIN 16742 TG5
The significance of adhering to the DIN 16742 - TG5 standard cannot be overstated. Here are several reasons why:
The standard provides as guidance for assigning plastic moulding compounds to the correct tolerance groups, ensuring a consistent and logical method of classification. The selection process considers influencing factors, each with a corresponding point score to determine the appropriate group. Industrial Applications of DIN 16742 TG5 The significance
: Dimensions formed by a single, solid part of the mould. These typically have tighter tolerances because they are not affected by mould movement.
: Dimensions affected by the opening/closing of the mold or moving parts (like sliders), which require larger tolerance ranges. Super-Ingenuity Implementation Recommendations
DIN 16742 defines nine tolerance groups numbered from to TG9 (loosest) . Each TG corresponds to a specific basic tolerance grade (IT grade) according to DIN EN ISO 286-1, the international standard for limits and fits. : Dimensions formed by a single, solid part of the mould
strategy—designing the mold slightly "small" so that plastic can be added later by removing small amounts of metal after initial testing. 4. Comparison to Other Tolerance Groups
When applying TG5 under DIN 16742, dimensions are categorized based on how they are formed in the tool:
The selection of a tolerance group is not arbitrary. The standard provides a structured, point-based scoring system that evaluates five individual influence factors. The sum of these points directly determines which TG is achievable for a given part in a given production environment. Those five factors are:
In this standard, stands for Tolerance Group . The standard defines nine groups (TG1 through TG9), where lower numbers represent tighter, more expensive precision, and higher numbers represent looser, more economical tolerances.
Instead of thickening a surface to add strength, use thin, well-supported ribs. This preserves structural integrity without introducing mass blocks that hold heat and warp. Tooling and Mold Calibration