Iso 20457 Tolerance Table Pdf High Quality

Purpose and scope

Many commercial standards retailers provide document previews showing the table of contents before purchase.

Failing to account for material shrinkage leads to unrealistic tolerances. A tolerance that is achievable in ABS (low shrinkage) may be impossible in unfilled nylon (high shrinkage). Always reference the appropriate shrinkage group when specifying tolerances.

The standard classifies manufacturing accuracy into . Each group represents a specific balance between the complexity of the production process and the inherent properties of the plastic material. Tolerance Group Accuracy Classification Typical Application Examples TG1 to TG3 Extreme Precision Micro-optics, medical devices, ultra-tight aerospace gears. TG4 High Precision iso 20457 tolerance table pdf

By strictly adhering to ISO 20457, engineering teams can minimize costly mold revisions, reduce scrap rates, and guarantee seamless assembly of plastic components.

These tolerances apply directly to the dimensions determined by the physical mold cavity. Series W is further split into two sub-categories: Tool-Dependent Dimensions ( WAcap W sub cap A

Standard engineering molding; typical for structural components using stable polymers (e.g., POM, PBT, PA66 with glass fibers). Medium to High globally accepted baseline.

ISO 20457 (and its German equivalent DIN 16742) is the definitive global standard for manufacturing tolerances and acceptance conditions of plastic molded parts

Using official tables protects both the OEM and the molding supplier from disputes regarding part rejection.

ISO 20457 also provides general geometrical tolerance tables. For example: and application parameters to ensure cost-effective

The full table includes separate columns for:

Below is an exhaustive breakdown of the standard’s mechanics, tolerance tables, and application parameters to ensure cost-effective, high-yield manufacturing. What is ISO 20457?

The free search for an **“iso 20457 tolerance table pdf”” will often yield incomplete versions. The complete official PDF contains more than just the tolerance table. It includes:

Transitioning from metal design to plastic injection molding requires a shift in how you approach tolerances. Utilizing ISO 20457 ensures that your production team, mold maker, and quality control inspectors are operating under the same realistic, globally accepted baseline.