Iso 20457 Tolerance Table Pdf | 2026 Edition |

The PDF of this standard, particularly its essential tolerance tables, is more than just a document—it is a quality assurance tool that:

Refers to dimensions formed by the same tool part (e.g., within one mold half).

Look for "ISO 20457:2018 – Preview" on the ISO website. The free preview usually includes the scope, the first few pages, and crucially, the main tolerance table . For many internal design purposes, the preview table is sufficient, though you should buy the full standard for legal manufacturing contracts.

ISO 20457 intentionally excludes certain surface imperfections such as sink marks, undesired flow structures, roughness, and joint lines. The standard is also not intended to replace any product-specific tolerance requirements found in other standards.

Even with the PDF in hand, errors happen. Avoid these pitfalls: iso 20457 tolerance table pdf

Note: These values are typical approximations for linear dimensions; refer to the official standard for the full matrix covering all dimensions and specific material groups. Selection Process

Find the row in the table corresponding to your part's length, width, or diameter. For a 45mm long housing, you look at the "30 up to 120" row.

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

While ISO 20457 is specifically designed for plastic molded parts, ISO 2768 specifies general tolerances for machined metal components. ISO 2768 is typically applied to mold base plates, ejector pins, and other steel components machined via CNC, not to the plastic parts themselves. The PDF of this standard, particularly its essential

Understanding ISO 20457: The Ultimate Guide to Plastic Molded Part Tolerances

Simply stating "ISO 20457" on a drawing is insufficient. For a tolerance to be enforceable, the design documentation must include:

Used for Critical-to-Quality (CTQ) dimensions, such as snap-fits or bearing housings, though it requires more expensive tooling and process control.

The official PDF of ISO 20457:2018 can be purchased from several authorized national standards bodies and online retailers. These include the (available for preview on the ISO Online Browsing Platform), the British Standards Institution (BSI) , and the Intertek Inform standards store. National adoptions, such as the German DIN ISO 20457:2021-06 and the British BS ISO 20457:2018 , are also available and are technically identical to the international version. The official PDF typically costs around CHF 100 or more, depending on the distributor. For many internal design purposes, the preview table

based on material properties (such as shrinkage and stiffness) and the manufacturing process used. www.makrolar.eu Tolerance Tables Overview

A limited page preview is often available on the ANSI Webstore .

Specifying tools like a CMM (Coordinate Measuring Machine) or Optical Measurement Systems.