Din 16742 - Tg5 ((link)) Jun 2026

A material’s inherent shrinkage behavior dictates which tolerance group it can realistically achieve. Polymers are broadly categorized into two classes based on their molecular structures: Amorphous Plastics (Lower Shrinkage)

Plastic engineering differs fundamentally from metal machining. While metal changes size based almost purely on mechanical cutting and linear thermal expansion, plastics go through a complex thermodynamic transformation.

Under the standard, Tolerance Group 5 (TG5) represents a precision-oriented classification for plastic molded parts. It is typically applied to dimensions where standard production tolerances (like TG6) are insufficient but ultra-high precision (like TG3 or TG4) would be cost-prohibitive. Key Characteristics of TG5

These materials exhibit low and isotropic (uniform) shrinkage. They easily achieve TG5 tolerances.

It classifies materials into different accuracy groups, which then determine the applicable Tolerance Group. Deep Dive into Tolerance Group 5 (TG5)

A "TG5" claim on a drawing is meaningless without verification. The standard requires: din 16742 - tg5

Materials like Polyamide (Nylon) absorb ambient moisture, which causes them to swell over time. For TG5 components made of hygroscopic materials, dimensional checks must be performed only after the parts have reached structural equilibrium (conditioned state). 6. Conclusion

The sum (P_g = P_1 + P_2 + P_3 + P_4) — after applying the cost‑series adjustment (P_5) — yields a value from 1 to 9, which directly indicates the achievable tolerance group: a sum of corresponds to TG5 .

Achieving TG5 often requires tighter manufacturing tolerances on the injection mold itself, which can increase tooling costs compared to TG6 or TG7. 3. Dimensional Distinctions

DIN 16742 - TG5: The Blueprint for Standard Precision Injection Molding

Larger features (over 100mm) might have a tolerance exceeding ±0.30mm. Under the standard, Tolerance Group 5 (TG5) represents

injection-moulding-tolerances-din16742-2013.pdf - Xometry Pro

Published by the German Institute for Standardization (DIN), outlines the limits of deviations for linear and angular dimensions of molded plastic parts. It replaced the older DIN 16901 standard to align directly with modern international ISO standard networks.

Parts where dimension stability is crucial for performance and safety.

2. Non-Tool-Fixed Dimensions (Nicht werkzeuggebundene Maße)

Are you looking to apply these tolerances to a or a particular manufacturing process like injection moulding? Vacuum Casting | FACTUREE – The Online Manufacturer They easily achieve TG5 tolerances

represents the standardized threshold for precision design and manufacturing of plastic molded components, serving as the benchmark for "Standard Precision" within the global plastics industry. Established by the Deutsches Institut für Normung (DIN) to succeed the older DIN 16901 standard, this standard bridges the gap between what engineers model in CAD software and what plastic injection molding machines realistically output under stable production environments.

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

Easiest materials to hit TG5 requirements consistently. Semi-Crystalline High, anisotropic shrinkage ( PP, PE, PA6, POM

Dimensions affected by moving tool parts, such as sliders, cores, or the parting line. These usually have wider tolerances because they are subject to tool opening/closing variances. 2. Material Behavior