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Browse our selection of 3 1/2" door hinges with a square-corner leaf design — ideal for doors or frames mortised for sharp 90° corners. A matching square-corner hinge sits flush in a square-cut mortise, helping your door align properly and swing smoothly. Fast shipping from DoorCorner.com.
Why square corners matter: hinge corner shape must match the mortise shape. If your door or jamb is cut for square corners, using a rounded-corner hinge can leave visible gaps at the corners or require extra chiseling to make it fit. Choosing a 3 1/2" square-corner hinge helps ensure a clean, finished look and a straightforward replacement.
Where 3 1/2" hinges are commonly used: this size is frequently found on standard residential interior doors (bedrooms, bathrooms, closets) and other light- to medium-duty applications. For best results, confirm your existing hinge size and corner style before ordering, especially on replacement projects.
Fit tips before you buy: measure the height of your existing hinge leaf (top to bottom) to confirm the 3 1/2" size, and visually check whether the hinge corners are sharp (square) or rounded (radius). Matching both the size and the corner style is the simplest way to get a true drop-in fit.
What does “square-corner” mean for a door hinge?
“Square-corner” means the hinge leaves have sharp 90° corners (not rounded). This matches doors and frames that were mortised with square corners so the hinge can sit flush and the installation looks clean.
Why choose square-corner hinges instead of rounded-corner hinges?
If your mortise is cut for square corners, a square-corner hinge is the correct match. Using a rounded-corner hinge on a square-cut mortise can leave visible gaps or require extra chiseling to make the hinge fit properly.
Are 3-1/2" square-corner hinges compatible with standard residential doors?
In many cases, yes — 3-1/2" hinges are commonly used on standard residential interior doors and other light- to medium-duty applications. Always confirm your existing hinge size and that your door/frame is mortised for square corners.
When should I choose 3-1/2" hinges over other hinge sizes?
Choose 3-1/2" hinges when your current hinges (or your door/frame mortises) are already sized for 3-1/2". Matching the hinge height and corner style is the easiest way to ensure proper fit, simpler installation, and smooth door operation.
