Din 16742 - Tg5 -

| Standard | Fine Class | Typical Tolerance @ 50mm (ABS) | Application | | :--- | :--- | :--- | :--- | | DIN 16742 | TG5 | ±0.18 mm | German automotive (VW, BMW, Mercedes) | | ISO 20457 | Fine (T3) | ±0.22 mm | General European engineering | | US SPI | Class 401 | ±0.25 mm | US consumer products |

Always add a note to your drawing: "All dimensions per DIN 16742 - TG5 unless otherwise noted. Material group B (POM). Shrinkage pre-settlement required." This single line has saved countless tooling reworks. Need to implement DIN 16742 - TG5 in your next project? Consult with your molder before freezing the tooling design. The TG5 tolerance class works best when the molder participates in the DFM (Design for Manufacturability) review. din 16742 - tg5

When used correctly—on selective features, with appropriate materials, and validated by simulation—TG5 delivers reliable assemblies without bankrupting the project. For the 80% of industrial plastic parts that require precise assembly (automotive, medical devices, industrial controls), TG5 is the gold standard. | Standard | Fine Class | Typical Tolerance

Tool cost reduced by 18%. First-pass yield reached 97% (vs 82% if full TG5). The housing passed 95°C thermal shock testing. Need to implement DIN 16742 - TG5 in your next project

In the world of plastic injection molding, precision is not just a luxury—it is a contractual obligation. When an engineer specifies a tolerance, they are defining the functional limits of a part. However, not all tolerances are created equal. While general standards like ISO 20457 or ISO 286-2 exist, the German standard DIN 16742 reigns supreme for plastic components. Within this standard, the classification TG5 represents the "sweet spot" between high precision and economic manufacturability.

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.