Din 16742 - Tg5 _hot_ Info

DIN 16742

is the German industrial standard used to define manufacturing tolerances and acceptance conditions for plastic moulded parts . It replaced the older DIN 16901 and is often used alongside or as a reference for the international standard ISO 20457 . Tolerance Group 5 (TG5) Overview

To determine if TG5 is appropriate for a part, engineers should conduct a tolerance analysis:

. Thinner walls (as low as 0.7 mm for PBT) cool faster and can help maintain dimensional stability 4. Pro Tip: The "Steel Off" Strategy When aiming for TG5 accuracy on critical fitting features: Design it "Small": din 16742 - tg5

TG5

If you specify , you are demanding the tightest plastic tolerances possible. This feature eliminates most standard injection molders—only those with high-end moldmaking (tolerances < 0.005 mm on cavities) and fully automated process monitoring can reliably hold TG5.

—such as stiffness and shrinkage—rather than just listing specific materials, allowing for more accurate predictions across various resins. Deep Mould Breaking Down TG5 (Tolerance Group 5) Within DIN 16742, "TG" stands for Tolerance Group DIN 16742 is the German industrial standard used

The key feature of TG5 is that it is the highest (strictest) precision grade

in the standard, requiring the most accurate molds and stable processing conditions.

: When designing for TG5, engineers must account for the specific resin tolerance Press-fit or snap-fit with tight functional clearance (&lt;

• Press-fit or snap-fit with tight functional clearance (< 0.1 mm total).
• Bearing journals or guide rails requiring consistent clearance.
• Parts mate with metal components without adjustment.
• Temperature changes > 30°C affect critical fits (then tighter or selective assembly needed).

Standard Engineering Components:

Parts where functional fit is important but doesn't require extreme sub-millimeter precision.