A bracket for supporting the travelling crane is shown in Figure given below. The bracket is fixed to the steel column by means of four identical bolts, two at A and two at B. The maximum load that comes on the bracket is 5 kN acting vertically downward at a distance of 250 mm from the face of the column. The bolts are made of steel 40C8 (Syı = 380 N/mm²) and the factor of safety is 5. Determine the major diameter of the bolts on the basis of maximum principal stress. Assume (dc = 0.8d).