Din 16742 - Tg5

for a specific material like ABS or POM.

: Engineers are advised by firms like Pekago Covering Technology to design parts at the "middle" of the tolerance field to allow for material fluctuations.

DIN 16742 organizes tolerances into several groups (TG1 to TG8). TG5 sits at the higher end of precision, often described as fine or high-precision. When to Use TG5

Injection moulding is the primary manufacturing method associated with TG5. For prototype and low-volume production, can also achieve TG5 tolerances, with a minimum tolerance of ±0.1 mm and general tolerances of 0.4 – 0.5% of the nominal dimension. din 16742 - tg5

| Nominal Size Range (mm) | Limit Deviation (± mm) | | :--- | :--- | | 1 - 3 | 0.12 | | >3 - 6 | 0.18 | | >6 - 10 | 0.22 | | >10 - 18 | 0.26 | | >18 - 30 | 0.31 | | >30 - 50 | 0.37 | | >50 - 80 | 0.57 | | >80 - 120 | 0.80 | | >120 - 250 | 1.05 |

To prevent warping, ensure that wall thickness is uniform throughout the part.

The standard defines distinct tolerance groups—TG1 through TG7—each corresponding to the manufacturing precision required. This classification acknowledges that not all plastic parts are created equal; a simple cable clip does not require the same precision as an optical housing or a medical device component. By specifying a tolerance group, manufacturers can select the appropriate molding parameters, materials, and quality control measures. for a specific material like ABS or POM

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).

If you need help implementing these manufacturing tolerances on your technical drawings, let me know:

: It eliminates the need for redundant "habitual tolerances" on drawings by providing a generalized table for linear and angular dimensions. Process Specificity : The standard distinguishes between mold-fixed dimensions (formed by a single mold part) and non-mold-fixed dimensions TG5 sits at the higher end of precision,

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

Note: For dimensions below 1 mm or specific wall thickness applications, special direct agreement between the manufacturer and client is required.

Reserved for hyper-precision or highly specific laboratory-grade tooling configurations.

TG5 enforces flatness, roundness, and parallelism. A TG5 part cannot simply have the right width; its side walls must be straight within 0.1 mm over 100 mm.

A classification system ranging from very fine to coarse (e.g., TG3 to TG8).