For critical features, it is strongly recommended to specify TG5 only on functionally relevant dimensions, while allowing coarser grades (e.g., TG8–TG10) on non-critical geometries to balance cost and performance.
Within this standard, represents a high-precision classification. It is typically applied to parts that require tight functional fits, consistent assembly behavior, or superior geometric stability without resorting to post-molding machining. din 16742 - tg5
| Nominal Size Range (mm) | Approximate Tolerance Class TG5 (mm) | Practical Interpretation | |------------------------|--------------------------------------|---------------------------| | 0 – 10 | ±0.05 to ±0.08 | Very tight; requires stable process & precision mold. | | 10 – 50 | ±0.08 to ±0.12 | Typical for functional bearing/shaft fits. | | 50 – 160 | ±0.12 to ±0.20 | Demanding for larger parts; watch for warpage. | | 160 – 400 | ±0.20 to ±0.35 | High precision for large geometries; design must minimize stress. | Note: Actual values depend on material shrinkage, part geometry, and feature type (free dimension vs. fixed dimension). Always refer to the latest DIN 16742 tables. For critical features, it is strongly recommended to