Din 16742 - Tg5

Larger parts generally require larger, or more flexible, tolerances.

To successfully produce parts in Series 3 or 4, the following conditions must be met:

falls in the middle of the standard spectrum, situated between the highly precise lower groups (TG1–TG3) and the looser, general-purpose higher groups (TG6–TG7).

Variations in wall thickness cause localized differences in cooling rates. This leads to uneven shrinkage, sink marks, and warping that can instantly push a part outside of TG5 limits. Incorporate Generous Draft Angles: Implement a minimum of 1∘1 raised to the composed with power 2∘2 raised to the composed with power

: Note that DIN 16742 was officially withdrawn and superseded by the international standard DIN ISO 20457:2020-03 . Comparison of Tolerance Groups

Avoid TG5 if:

Are the critical features located across a ? Share public link

It is typically applied to structural housings, gears, snaps, and multi-component assemblies where interference fits must be avoided.

Amorphous polymers display random molecular chains that do not pack tightly upon cooling. This results in low, uniform shrinkage (typically 0.3% to 0.7%), making them ideal candidates for achieving TG5 tolerances easily.

The specification is a powerful tool for global engineering teams. It provides a standardized language that aligns the expectations of the product designer, the toolmaker, and the quality control department. By understanding that TG5 represents precision-level control, and by designing your parts to accommodate the material and tooling constraints dictated by the standard, you can ensure high-yielding, high-quality production runs for complex plastic assemblies.

Plastics shrink as they cool, but they do not all shrink equally. DIN 16742 classifies materials into evaluation groups based on their shrinkage behavior:

Extremely tight, specialized tolerances typically reserved for high-precision optical components or micro-toolmaking.

DIN 16742:2013-10, titled "Plastics moulded parts - Tolerances," provides a standardized framework for establishing limit deviations (tolerances) for linear and angular dimensions on plastic parts without specific tolerance indications.

Unlike standards for machined metal parts, DIN 16742 accounts for the unique behavior of plastics. The standard distinguishes between two types of dimensions: