The torque gradually increases from point A to point B, due to friction in the
thread and thread forming forces. The head of the screw touches the part at
point B, after which the torque increases rapidly until point D, where the
stripping torque is reached and the material starts to yield or break. The
tightening torque (point C) should be chosen at least by a factor of 2 smaller
than the stripping torque. The tightening torque and the stripping torque can
best be determined experimentally.
During the assembly process the maximum speed must not go beyond 500 rpm. At
higher speeds, the resulting friction may melt the material.
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