m20的螺絲用多大的扭剪扳手？
What size of a torsion shear wrench is used for M20 screws?
m20的螺絲扭力是多少
What is the screw torque of M20
這個問題提得太籠統(tǒng)了，缺少有效的信息：
This question is too general and lacks effective information:
1.螺絲等級（材料）
1. screw grade (material)
2.螺絲表面處理（決定了扭矩系數(shù)）
2. screw surface treatment (determines the torque coefficient)
3.螺絲的牙距，決定了拉應力受力面積
3. the thread pitch of the screw determines the tensile stress area
4.螺絲所需要達到的夾緊力（和螺絲的等級有關系，等級決定上限,一般夾緊力為保證載荷的75%，但汽車行業(yè)由于輕量化要求，會安裝到屈服強度）
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)
一般的計算公式：T=KDF(扭矩=扭矩系數(shù)*拉應力受力面積*螺絲所需要的夾緊力）
General calculation formula: t=kdf (torque = torque coefficient * stressed area of tensile stress * clamping force required for screw)
給給參考值吧
Give me the reference value
M20x2.5的粗牙外六角，10.9級，725-838Nm。（表面處理為電鍍鋅或者發(fā)黑/本色）
M20x2.5 coarse external hexagon, grade 10.9, 725-838nm. (the surface treatment is electro galvanized or blackened / natural color)
只要扭剪扳手達到相應的扭力能把扭剪螺栓的梅花頭擰掉就可以，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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