Abstract
In this study, the behavior of the basic tightening which occurred by tightening experiment of pipe flange by fundamental 4 volts by the interference of the volt of the mutuality as a multiple volt fastening body first of all was examined. As the result, beginning beginning 2 volts flange unstably, the linear relation is not established on tightening torque and axial force with the living to the volt the bending. In next 2 tightening, for it, since the flange has already been fixed, other effect to the bolt axial tension was also little, and it was proven that tightening torque and axial force also showed the linear relation.
