Door Hinge Corner Radius Guide: Square, 1/4" & 5/8" Explained
The standard plain bearing door hinge is simply two metal halves joined by a pin. When replacing hinges, three things determine the right match: the corner radius style, the size, and the material. This page covers corner radius — the most overlooked spec when ordering replacement hinges.
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Door hinge corner radius: the 3 styles
There are 3 corner radius styles. You must match your existing hinge mortise exactly — a square corner hinge will not sit flush in a rounded mortise and vice versa.
A small rounded corner. The radius matches the edge of a US dime. Most common on residential interior doors.
A larger rounded corner. The radius matches the edge of a US quarter. Common on older residential doors.
Pro Tip
Not sure if you have a ¼" or ⅝" radius? Measure from where the curve begins to where the corner of the hinge would be if it were square. That measurement is your radius.
Our Steel Hinges and Brass Hinges are available in up to 11 different finishes.
Need help choosing?
Not sure which corner radius you have? Contact us and we'll help you identify the right replacement hinge. Browse our full hinge collection or return to the Help Center.