m20的螺丝用多大的扭剪扳手？
What size of a torsion shear wrench is used for M20 screws?
m20的螺丝扭力是多少
What is the screw torque of M20
这个问题提得太笼统了，缺少有效的信息：
This question is too general and lacks effective information:
1.螺丝等级（材料）
1. screw grade (material)
2.螺丝表面处理（决定了扭矩系数）
2. screw surface treatment (determines the torque coefficient)
3.螺丝的牙距，决定了拉应力受力面积
3. the thread pitch of the screw determines the tensile stress area
4.螺丝所需要达到的夹紧力（和螺丝的等级有关系，等级决定上限,一般夹紧力为保证载荷的75%，但汽车行业由于轻量化要求，会安装到屈服强度）
4. the clamping force required for the screw (related to the screw grade, which determines the upper limit. Generally, the clamping force is 75% of the guaranteed load, but the automotive industry will install it to the yield strength due to the lightweight requirements)
一般的计算公式：T=KDF(扭矩=扭矩系数*拉应力受力面积*螺丝所需要的夹紧力）
General calculation formula: t=kdf (torque = torque coefficient * stressed area of tensile stress * clamping force required for screw)
给给参考值吧
Give me the reference value
M20x2.5的粗牙外六角，10.9级，725-838Nm。（表面处理为电镀锌或者发黑/本色）
M20x2.5 coarse external hexagon, grade 10.9, 725-838nm. (the surface treatment is electro galvanized or blackened / natural color)
只要扭剪扳手达到相应的扭力能把扭剪螺栓的梅花头拧掉就可以，可以用20扭剪扳手，也可以用24扭剪扳手
As long as the torsional shear wrench reaches the corresponding torque and can screw off the Torx head of the torsional shear bolt, 20 torsional shear wrenches or 24 torsional shear wrenches can be used
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