Iso 20457 Tolerance Table Pdf 【WORKING - 2024】

which includes the first few pages and Table 8 (General Tolerances). Detailed Overviews

Before diving into the table itself, it is essential to understand the scope of the standard. is titled "Geometrical product specifications (GPS) — Classification of tolerances for dimensional and geometrical characteristics."

: Tighter groups (TG1–TG3) are rarely used as they significantly increase mold costs and scrap rates.

Always confirm that the table shows and includes the separate columns for parting line (typically labelled “F” for “flash line” in German-influenced documents). iso 20457 tolerance table pdf

Example of a simplified tolerance structure (Not a complete table): Dimension (mm) TG3 (Tight) TG6 (Standard) TG7 (Loose) 30 - 100

The tolerance tables are split based on what is being measured. The two most common tables you will encounter are:

Used for large components, highly flexible elastomers, or recycled materials where structural integrity takes precedence over strict dimensional accuracy. Material Properties and Tolerance Determination which includes the first few pages and Table

For design engineers and procurement professionals, downloading an is essential to establish standardized, cost-effective, and technically achievable manufacturing boundaries. Setting excessively tight tolerances drives up mold tooling costs exponentially, while overly loose parameters risk assembly failures. This article breaks down how the standard works, how to read the tables, and why it is critical for modern plastics manufacturing. What is ISO 20457:2018?

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. The standard serves three primary functions:

Note: Unlike outside diameters, wall thickness usually has bilateral tolerances ($\pm$). Always confirm that the table shows and includes

ISO 20457 specifies permissible dimensional and geometrical deviations for plastic molded parts. It applies to various manufacturing processes, including injection molding, compression molding, transfer molding, and rotational molding.

Note: These are illustrative values — always refer to the full standard for critical applications.

Determine if your plastic resin falls into a low, medium, or high-shrinkage category.