Iso 20457 Tolerance Table Pdf //top\\ Jun 2026

TG6 is widely used for standard thermoplastic parts in applications such as packaging and general consumer goods. Many commercial manufacturers specify ISO 20457 TG6 as their default general tolerance for thermoplastics.

(and its German equivalent DIN ISO 20457 ) is the primary international standard for specifying manufacturing tolerances of plastic molded parts

Identify if the plastic is amorphous (e.g., ABS, PC) or crystalline (e.g., PA66, POM) and if it is filled (glass/carbon fiber). iso 20457 tolerance table pdf

Understanding dimensional tolerances for plastic injection molded parts is crucial for designers, engineers, and manufacturers. Unlike metals, plastics are sensitive to thermal expansion, moisture absorption, and molding process variations. (which supersedes DIN 16742) provides the standardized framework for these tolerances, replacing older, less applicable metal-based standards.

The PDF of this standard, particularly its essential tolerance tables, is more than just a document—it is a quality assurance tool that: TG6 is widely used for standard thermoplastic parts

In manufacturing, "close enough" is rarely acceptable. Tolerance tables are the translation layer between a designer's intent and a machinist's execution. ISO 20457 tolerance tables are particularly important for several reasons:

Note: Exact values must be verified via the official ISO 20457 documentation, as calculations heavily rely on the specific material shrinkage group (VSG). Tooling Deviations vs. Process Deviations The PDF of this standard, particularly its essential

ISO 20457 categorizes tolerances into two distinct application groups based on whether the dimensions are tool-dependent or affected by post-molding assembly processes: 1. Series NW (Non-Tool-Dependent / Assembly Tolerances)

The PDF includes the exact formulas to calculate Volumetric Shrinkage Groups (VSG).

): Amorphous plastics (like Polycarbonate or ABS) experience low, uniform shrinkage (approx. 0.3% to 0.7%). Semi-crystalline plastics (like Polypropylene or Polyethylene) experience high, anisotropic shrinkage (approx. 1.5% to 3.0%), making them much harder to hold to tight TGs.