DIN 7952-1-1986《带螺纹的极绞孔. 尺寸》
The sheet metal anchorages with threads according to this standard are for general use. The tabulated values are independent to technical conditions of manufacture and apply to sheets the material of which does not unusually harden during forming, they do e.g. not apply to sheets made of austenitic steels.; The standard covers sheet thickness of s = 0,5 up to 4 mm and threads from M2 up to M10. For the single sheet thickness, it can be chosen between anchorage heights of 1,6 s,1,8 s and 2 s. However, anchorages with a low number of cracks can only be expected in the case of the different materials when the