Initially specified TG5 for all dimensions. After mold flow analysis, only the pin grid array (PGA) zones were mapped to TG5. The outer shell was relaxed to TG4.
of TG5 values against other tolerance groups for specific dimension ranges? Design Guide Spuitgieten - Pekago Covering Technology
If we look at a nominal dimension of :
One of the most important practical concepts in DIN 16742 is the division into four production . These determine what level of accuracy can be achieved for a given TG:
The tolerance value depends on the part’s nominal dimension (longest overall length or specific feature size). Common ranges include: din 16742 - tg5
| Tolerance Group (TG) | TG1 | TG2 | TG3 | TG4 | | TG6 | TG7 | TG8 | TG9 | |----------------------|-----|-----|-----|-----|--------|-----|-----|-----|-----| | Point sum | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
These have tighter tolerances because they are controlled entirely by the steel cavity. Initially specified TG5 for all dimensions
It classifies materials into different accuracy groups, which then determine the applicable Tolerance Group. Deep Dive into Tolerance Group 5 (TG5)