Same Hinge Size, Different Geometry: Why Manufacturer Changes Can Matter

Same Hinge Size, Different Geometry: Why Manufacturer Changes Can Matter Related diagnostic: When the Hinge Recess Makes the Blades Touch explores the connected fault pattern and helps compare the evidence before choosing a repair. Nominal hinge size is only one part of the geometry. Blade thickness, closed relationship, screw pattern, recess and actual seating can all change the leaf position. In Proudman field observations, replacement hinges from different manufacturers have been seen to differ in overall length by about 2 mm, with screw positions, blade thickness and the closed knuckle/blade relationship also changing. A difference of roughly 0.5 mm in each blade can create about 1 mm of positional effect. Treat those figures as practical observations to check against the actual hinge models, not as universal hinge dimensions. What the pattern is telling you Compare old and new hinges where…