To ensure that after manufacturing a surface has a certain distance between two parallel planes, the symbol Flatness is used.
The distance is entered after the symbol.
Flatness is a shape tolerance and describes in which range the most protruding and the most curved area of a surface may be apart.
![Flatness in Plastic Industry Flatness in Injection Molding](https://www.plexpert.ca/wp-content/uploads/2021/12/Flatness_Symbol.png)
Quality Assurance: Symbol of tolerated property with 0.06mm required flatness
Related topics:
This glossary of plastic industry is provided by PLEXPERT Canada Inc.