Colloquially known as round corner hinges, radius corner hinges are used mainly on residential doors but also in some commercial applications. In the United States radius corner hinges come in two curvatures: ¼-inch radius and 5/8-inch radius. The difference is easy to see when the different radius hinges are side by side as shown below.
They are called radius corner because their degree of curvature is determined by the length of the radius of an imaginary circle. The ¼-inch radius corner is based on the radius of a ½-inch diameter imaginary circle and the 5/8-inch radius corner is based on the radius of a 1-1/4-inch diameter circle as shown in the following illustration:
When we superimpose the imaginary circles onto hinges we see how the length of the radius affects the curvature:
In these examples I show 4-1/2 inch x 4-1/2 inch ball bearing full mortise hinges.
For more about hinges, click here.
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