High strength bolt joints used on the steel truss bridge are the mechanism of slip-critical. This mechanism relies on the clamping force of high strength bolt pretension led to friction between the surface of the tied steel plates, so the forces acting on the elements of the steel bridge held by the friction. In order to get the ratio of the pretensioning and observe the mode of failure, then the experiments in the laboratory and the simulation using software were carried out. The method used in this experiment was trial and error so that the value of the pretensioning of high strength bolts needed to reach the maximum axial load press was retrieved. There are four types of the surface coating of the tied steel; milling, grit-blast cleaning, coat of primer paint by grit-blast cleaning and coat of hot-dip galvanized given chromate treatment. The results obtained show that the ratio of the pretensioning on high strength bolt between the simulation and the experiments do not look different; the range is 0.97. The pattern of failure that occurs in the simulation tends to be more regular and quite small in comparison with the experimental results.