According to the general normal blanking gap, the bilateral blanking gap value of 7mm thick material should be 18%, that is,1.26 mm. Now the blanking section needs full bright belt, and its blanking gap value will be reduced. The value of bilateral clearance can be 0.1mm. 45# steel is medium carbon steel, and the gap value is greater than low carbon steel such as 20CrMnTi.