Iso 20457 Tolerance - Table Pdf

If you need to calculate a specific for a project, feel free to share your nominal dimensions , plastic material type , and whether the features are tool-dependent , and I can help you find the exact values. Share public link

A universal language between designers and molders worldwide.

The standard classifies materials into five shrinkage groups (SG1 through SG5) based on their molding shrinkage ranges:

The standard uses a tiered system to assign tolerance groups (TG) based on the material's complexity and the required precision: iso 20457 tolerance table pdf

Used for highly flexible materials or parts where dimensional precision is not critical to function.

ISO 20457 uses to define the achievable accuracy based on the manufacturing process and material properties.

The tolerance table in ISO 20457 defines permissible deviation values based on: If you need to calculate a specific for

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

Manufacturing high-quality plastic components requires strict control over dimensional variations. Unlike metals, plastics undergo complex shrinkage, warping, and thermal expansion during and after production.

Dimensions formed by a single, solid piece of the mold tool. These naturally have tighter tolerances because tool-wear is minimal. ISO 20457 uses to define the achievable accuracy

ISO 20457 specifies the possible manufacturing tolerances for plastic molded parts. It applies to injection molding, compression molding, transfer molding, and rotational molding of thermoplastic and thermosetting materials.

). For the definitive, legally binding matrix, always consult the official ISO 20457 PDF documentation. Nominal Dimension (mm) 3 to 6 6 to 10 10 to 18 18 to 30 30 to 50 50 to 80 80 to 120 120 to 180 180 to 250 Factors Influencing Plastic Molded Tolerances

Determine the shrinkage factor of your chosen resin (e.g., ABS, PC, PA66).

The Tolcap Rough Guide to Tolerancing Plastic Mouldings - Tol