1. With the choice should be reasonable, preference-based hole system, as far as possible with the selection of priorities and common areas;
2. Sheet metal parts have to consider the size of the base select the design requirements, but also consider the processing of positioning and measurement of test requirements;
3. Has assembly required with the size of the two parts should be tolerance requirements;
4. An important dimension to be complete, correct and clear;
5. Tolerance level should be chosen to be appropriate;
6. Did not note Tolerance and non-injection use of geometric tolerances according to information platform / design specifications / technical specification "not note Tolerance technical specifications" and "did not note form and position tolerance specifications," the implementation.
7. Sheet Metal geometric tolerance selection should be reasonable and appropriate;