There are many kinds of hardness test methods, including Rockwell hardness, Brinell hardness, Vivtorinox hardness, Knoop hardness, Ricker hardness, Wechsler hardness, bhiner hardness and so on. Each test method also includes different test conditions.

The torque coefficient will be changed due to the use conditions. Please use this table as its reference standard.

The above is the strength calculation method, in fact, we should consider the precision, hole, perpendicularity and surface roughness of the clearance between holes.

According to the torque size, adjust the diameter of the axis, can choose the larger shaft diameter, but can not choose too small diameter. The size of the bracket in brackets is not the international specification, the new design should not be used.