2019 Volume 75 Issue 2 Pages 257-265
High strength hexagon bolts are widely used to bolted joints in steel bridges. It is known that their bolts vary widely of torque coefficients. However, characteristics of torque coefficients not clarified. In this paper, we have investigated the 4815 of torque coefficients on the basis of the mill sheet data and bolt-tightening tests data in order to clarify torque coefficients on high strength hexagon bolts of 22 mm diameter. We also have investigated the mechanical properties of their bolts.