Din 16742 - Tg5 Jun 2026

Selective TG5 application is smarter than blanket tolerancing.

In the world of high-precision manufacturing, is the law of the land for plastic molded parts, and TG5 is its elite "Accurate Production" standard. This is a story of a part that refused to fit—and the engineer who had to fix it. The Precision Paradox Elias stared at the 3D model of the " Nexus Connector

: Features affected by moving parts of the mold, such as parting lines, slides, core pulls, or changing clamping forces. These require wider tolerance allowances due to the accumulation of mechanical variances. Typical Value Range for TG5

: While standard injection molding often defaults to TG6 for general dimensions, TG5 is considered a feasible standard for high-quality parts when the process is well-optimized.

: The size of the feature (e.g., 10mm vs. 150mm). din 16742 - tg5

What specific or polymer blend you plan to use. The maximum physical dimension of your part.

Work with your molder to run moldflow simulations. Ensure that gates are placed away from critical TG5 features to avoid high internal stress and knit lines near those dimensions.

: Dimensions formed within a single mold half; these typically allow for tighter tolerances. Non-tool-specific (NW)

This article explores everything you need to know about DIN 16742 - TG5: its definition, mathematical foundations, practical applications, and how it compares to other tolerance classes. The Precision Paradox Elias stared at the 3D

For measurements to be valid under DIN 16742, parts must be conditioned according to : Temperature : Humidity : relative humidity.

Semi‑crystalline plastics shrink more in the flow direction than across it (anisotropy). A TG5 specification on a drawing does not magically eliminate this behaviour; the designer must still account for anisotropic shrinkage in the mould design and in any critical mating features.

: Shrinkage properties of different polymers (e.g., PP vs. ABS) will affect how easily TG5 is achieved.

: Generally falls under Series 2 (Accurate Production) , meaning production and quality assurance are oriented toward higher dimensional stability than standard commercial grades (like TG6). : The size of the feature (e

Understanding how Tolerance Group 5 (TG5) governs linear, angular, and wall dimensions protects designs from common tooling issues, component warpage, and assembly failures. What is DIN 16742?

Many molders hesitate to guarantee TG5 for three reasons:

Small variations in melt temperature, injection pressure, hold time, and cooling rates change the final part dimensions. Molders must use advanced closed-loop processing machinery to maintain the stable environment required for TG5 consistency. 5. Engineering Benefits and Cost Trade-offs