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Browse our selection of 4" door hinges with a square-corner leaf design — ideal for doors or frames mortised for sharp 90° corners. Square-corner hinges sit flush in square-cut mortises, helping ensure proper alignment and smooth door operation. Fast shipping from DoorCorner.com.
Why square corners matter: hinge corner shape must match the mortise shape in the door and frame. Using a rounded-corner hinge in a square-cut mortise can leave visible gaps, create uneven edges, or require extra chiseling. Choosing a square-corner hinge helps maintain a clean, finished appearance.
Common applications: 4" square-corner hinges are commonly used on standard residential interior doors, closets, storage rooms, and many exterior doors where added hinge surface is beneficial. The larger leaf size offers improved load distribution when matched correctly to door weight and thickness.
Fit tips before ordering: measure the height of your existing hinge (top to bottom) to confirm the 4" size, and check whether the hinge corners are square rather than rounded. Matching both hinge size and corner style is the easiest way to ensure a direct replacement.
What does “square-corner” mean on a door hinge?
“Square-corner” refers to hinge leaves with sharp 90° corners instead of rounded edges. This design matches doors and frames mortised for square-corner hinges so the hinge sits flush.
Why choose square-corner hinges instead of rounded-corner hinges?
When a mortise is cut for square corners, a square-corner hinge provides proper leaf seating and even door gaps. Rounded-corner hinges can leave small gaps or cause misalignment in square-cut mortises.
Are 4" square-corner hinges suitable for standard residential doors?
In many cases, yes. These hinges are commonly used on standard interior doors and many exterior doors, provided the door weight, thickness, and hinge capacity are compatible.
When should I choose 4" hinges over smaller hinge sizes?
Choose 4" hinges when your existing mortises are sized for 4" leaves, when additional hinge surface is desired for heavier doors, or when replacing original 4" hinges to maintain proper fit and durability.
