(Solved):   For an M12 x \( 1.75 \) grade \( 10.9 \) bolt, determine an appropriate tightening torque ...

 

For an M12 x \( 1.75 \) grade \( 10.9 \) bolt, determine an appropriate tightening torque (in Nm) considering axial AND torsional shear stresses. Assume a factor of safety of 1 and a bolt strength of \( 75 \% \) of the proof stress. NB: \[ \begin{array}{l} A_{t}=86.3 m^{2} \\ \sigma_{\text {proof }}=830 M P a \end{array} \] Major bolt diameter \( =12 \mathrm{~mm} \) Minor bolt diameter \( =10.106 \mathrm{~mm} \)