Dimensional tolerances depend on the nominal size range (mm) of the feature. Below is a simplified table for TG5 (based on DIN 16742, general tolerances for non-critical dimensions):
| Nominal dimension (mm) | Tolerance ± (mm) | |------------------------|------------------| | 0 – 3 | ±0.08 | | 3 – 6 | ±0.12 | | 6 – 10 | ±0.15 | | 10 – 18 | ±0.20 | | 18 – 30 | ±0.25 | | 30 – 50 | ±0.30 | | 50 – 80 | ±0.40 | | 80 – 120 | ±0.50 | | 120 – 180 | ±0.65 | | 180 – 250 | ±0.80 | | 250 – 315 | ±1.00 | | 315 – 400 | ±1.20 |
⚠️ These are general linear tolerances. For functional features (e.g., fits with metal parts), tighter TG3 or TG4 is recommended.
Implementing DIN 16742 - TG5 involves both manufacturers of tool holders and end-users. For manufacturers, it means adhering to strict design and production guidelines. For end-users, it involves selecting tool holders that are certified to meet the standard and understanding how to properly use and maintain them. din 16742 - tg5
However, there are challenges. The primary challenge is ensuring compliance and verifying that tool holders meet the standard's requirements. This often involves third-party inspection and certification processes. Additionally, as technology evolves, standards must be periodically reviewed and updated, which can be a resource-intensive process.
TG5 assumes dimensional stability at 23°C / 50% RH. If your part operates at 80°C in PA66, the tolerance must be loosened by 25% due to creep—or switch to glass-filled material.
✅ Typical use cases: Housings, brackets, connectors, gears with coarse pitch, structural parts, and consumer goods where fit isn’t extremely tight. Dimensional tolerances depend on the nominal size range
DIN 16742 is a standard that specifically deals with tool holders and their interfaces. Tool holders are essential components in machine tools, serving as the bridge between the machine and the cutting tool. They are critical in ensuring that the cutting tool is accurately positioned and securely held during the machining process. The standard covers various aspects, including dimensions, materials, and performance requirements for tool holders.
On a technical drawing, you can write:
TOLERANCES: DIN 16742 – TG5
Draft angles: 1.0° per side unless noted
All dimensions in mm; burrs max. 0.2 mm ⚠️ These are general linear tolerances
Or, to combine:
DIMENSIONS: DIN 16742 TG5 (linear mm)
FORM & POSITION: DIN 16742 TG5
SURFACE: V2
TG5 stands for Tolerance Grade 5 within the DIN 16742 framework. It is classified as a "fine" tolerance for injection molded parts. In practical terms, TG5 sits exactly in the middle of the standard's capability range: