Influences of Bearing Surface Perpendicularity of Threaded Fasteners on Characteristic Factors of Tightening

Abstract

This report deals with the influence of perpendicularity of bearing surfaces of bolted joints on the bending moment loaded to bolt shanks. As test samples, the followings are employed : specially made M10×1.25 bolts and nuts with the thread gage class accuracies, and plates fastened by them which have slope angles of 0∿1.2°between two end surfaces. A torsion test machine is applied to fastening experiments. About this subject, analytical solutions are derived by a simple calculation and a FEM analysis. Especially, experimental values agree well with the latter results.