This paper deals with the computer modelling of tightening of the bolted connection. The analysed bolted connection consisting of the M24 metric thread is used for clamping the flexible yokes that fix the steel segments of the mine yielding support. In mining practise, it is necessary to cause the prescribed pretension in the bolted connection. One of the methods to precisely determine dependency of tightening moment on the pretension in the bolt is the finite element method. The models of the bolt and the nut were created and assembled according to drawings without shape simplification. This work was created on the basis of practical requirements from mining industry and the obtained results will be reflected in the optimization of the bolted connection.

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