Iso 20457 Tolerance Table Pdf

Used for high-precision components like internal gears or small medical parts. TG5 (Medium): Typical for functional housing parts.

The tolerances vary depending on the material, as different plastics shrink and mold differently. The standard generally divides materials into groups: iso 20457 tolerance table pdf

Covers processes like injection molding , compression molding, and rotational molding for thermoplastics and elastomers ISO . Where to find the full PDF Used for high-precision components like internal gears or

ISO 20457:2018 is the primary international standard for determining for non-porous plastic molded parts. It replaces the older DIN 16742 standard and provides a systematic way to calculate achievable tolerances based on material properties and manufacturing processes. Unlike metal machining standards, ISO 20457 accounts for the unique behavior of plastics, such as mold shrinkage and environmental sensitivity. Key Components of ISO 20457 The standard generally divides materials into groups: Covers

The standard, which replaces the older DIN 16742 , is the primary international guideline for determining tolerances of plastic molded parts. Unlike metal components, plastic parts undergo significant shrinkage and environmental changes, making standard rigid-body tolerance chains (like ISO 286) often unsuitable. Core Tolerance System (Tolerance Groups)

The ISO 20457 tolerance table provides a detailed list of tolerances for various features, including: