Iso 20457 Tolerance Table Pdf //free\\

For general injection molding projects, DIN ISO 20457 TG5 is commonly applied as the default tolerance class when no specific tolerances are specified on the technical drawing.

ISO 20457 has become the global benchmark for tolerancing injection-molded plastic parts. By adopting this standard, designers and engineers can move away from guesswork and ambiguous specifications. iso 20457 tolerance table pdf

The tolerance standards applicable for metal parts cannot be adopted for plastic structures or can only be applied to a very limited extent, which is precisely why ISO 20457 was developed. Plastic part variation comes from material shrinkage, cooling rate, and process fluctuation—not just from mold steel precision. For general injection molding projects, DIN ISO 20457

The distinction between W-type (tool-related) and NW-type (non-tool-related) dimensions is critical. Dimensions affected by moving mold components (slides, parting lines, core pulls) inherently have wider tolerances than cavity-controlled dimensions. The tolerance standards applicable for metal parts cannot

Note: For the exact breakdown across all groups (TG1–TG9) and specific material assignment matrixes, engineering teams must consult the official ISO 20457 PDF documentation.