Design the connection between the shown cylinder and cover using tap bolts (ISO 4017). The bolts are distributed equally over an imaginary circle having a 165mm diameter.

Given that the force acting on the cover is (7000) N.

Meanwhile, the number of bolts used is (8) bolts.

Using the following data, determine the diameter (smallest size) of the bolts used in the connection (mm).

Data:

• All coefficients of friction are equal to 0.2.
• The tightness factor equals 1.
• The force input factor equals 1.
• The cylinder and cover are made of DIN St37.0.
• The bolts’ material is DIN X10Cr13.
• Required safety factor is 2.
• Allowable thread pressure is 7 MPa.