Get a 5-inch heavy-duty hinge if your door is between 2 and 2-1/2 inches thick or 42 inches wide. Door widths above 42 inches and thicknesses of 2 to 2-1/2 inches require 6-inch commercial hinges. Step 5: Note All Measurements. Take note of the radius, width, and height of the hinge you need. You can use these numbers to choose a hinge that