The selection of TG5 is highly strategic. It is the default choice for functional components that require a degree of reliability and fitment but do not fall into the category of high-precision instrumentation.
Tolerances in DIN 16742 are categorized based on the required precision and manufacturing process: : Extreme precision parts. TG4 : High-precision parts. TG5 : Standard precision applications (baseline). din 16742 - tg5
Most injection molders will warn against specifying TG7 or TG8 for mass production. While they are mathematically possible, they drive tooling costs up by 40–60% and scrap rates through the roof. The selection of TG5 is highly strategic
: He ensured uniform wall thickness to prevent the "warpage" that often plagues high-shrinkage plastics. din 16742 - tg5