Din 16742: - Tg5

In the world of injection molding, precision isn't just a goal—it's a requirement. If you've encountered the specification , you're looking at a specific German engineering standard designed to ensure plastic parts fit perfectly every time. This guide breaks down what "TG5" means and why it's the "sweet spot" for modern manufacturing. What is DIN 16742?

Initially specified TG5 for all dimensions. After mold flow analysis, only the pin grid array (PGA) zones were mapped to TG5. The outer shell was relaxed to TG4.

The following table highlights how TG5 sits within the hierarchy of DIN 16742: Tolerance Group Production Type Typical Usage/Requirements

DIN 16742 distinguishes between — dimensions within the same tool component, and non-tool-specific dimensions (NW) — dimensions resulting from the interaction of different tool components. Non-tool-specific dimensions tend to have larger tolerances due to cumulative manufacturing deviations. din 16742 - tg5

For practical engineering use, the most important aspect of TG5 is the numerical tolerance band it prescribes. Under DIN 16742, tolerances are given as ((\pm) value) and are split into two categories:

The selection of TG5 depends on the molding process, material shrinkage, part geometry and wall thickness, process capability, mold quality, and post-molding conditions. Plastic materials, especially semi-crystalline types like PA, PP, and POM, exhibit significant shrinkage and warpage due to their internal structure.

: When designing for TG5, engineers must account for the specific resin tolerance In the world of injection molding, precision isn't

Larger features (over 100mm) might have a tolerance exceeding ±0.30mm.

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

DIN 16742 is closely linked to the international standard (or ISO 20457), which covers the same subject — tolerances for plastic moulded parts — at an ISO level. In practice, the two standards are used interchangeably; many companies and software tools support both. The primary difference is that DIN 16742 retains some German‑specific details and references, while ISO 20457 is intended for global application. For most practical engineering purposes, TG5 values in DIN 16742 align with the corresponding tolerance class in ISO 20457. What is DIN 16742

is characterized as a "high-standard" or "accurate" production grade. While TG6 is often the baseline for standard commercial plastics, TG5 represents a step toward Precision Production

Note: For large parts, TG5 may be unnecessarily expensive or technically challenging to achieve due to significant shrinkage; in such cases, is preferred. Calculating DIN 16742 TG5 Tolerances

The "TG5" likely refers to a specific test method within this standard.

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