In a wedge clamping device, wedge inclination angle is $7\mathrm{.}41,-0\mathrm{.}08$ on wedge surfaces, bolt.

Since the tensile force is $7\mathrm{.}6kN,$ the bolt quality group is $4\mathrm{.}6$ and the safety coefficient is $S-3$;

a$)$ Find the compression force.

b$)$ Calculate the screw diameter and select the standard bolt.

c$)$ Friction moment under the nut; Since $\frac{1}{3}$ of the nut tightening torque is $-0\mathrm{.}10$

on the screw surfaces, find the nut tightening torque.

d$)$ Make a control calculation according to the maximum shear stress hypothesis for the selected metric bolt.