Hinge Fatigue

Why Do Commercial Garage Door Hinges Sag and Jam Tracks? Reference Standard: ANSI/DASMA 102 (Specifications for Sectional Doors) and ASTM E8/E8M (Standard Test Methods for Tension Testing of Metallic Materials). Short Answer Standard-gauge commercial door hinges fail because the immense downward gravity of heavy sectional doors causes radial yielding in the hinge barrels, gradually stretching them from perfect circles into elongated ovals. This geometric distortion forces the solid pivot pin to act as a dull blade, slicing through the thinned metal wall, which creates a severe kinetic vector deviation that drives the door panels laterally into the steel tracks, resulting in immediate mechanical jamming and motor overload. Radial Yielding & … 続きを読む