3 1/2" Hinges with a 1/4" Radius are designed for doors and frames
that use gently rounded hinge mortises rather than square corners. The 1/4" radius refers
to the small curve on each hinge-leaf corner, which must match the door’s existing mortise
for a clean, flush installation.
Using the correct hinge radius is especially important when replacing existing hinges.
Installing a square-corner hinge into a rounded mortise can cause uneven gaps, poor alignment,
or require additional chiseling. Matching the 1/4" radius helps the hinge sit properly
and allows the door to swing smoothly.
These 3 1/2" hinges are built to standard residential specifications and are commonly
used on interior doors such as bedrooms, bathrooms, closets, and hallways. When matched to
the appropriate door weight and application, they provide reliable performance and
straightforward installation.
3 1/2" Hinges with 1/4" Radius FAQ▾
What does a 1/4" radius mean on a hinge?
A 1/4" radius means the corners of the hinge leaf are rounded with a 1/4-inch curve
instead of sharp square corners. This shape is designed to fit doors and frames that are
mortised for rounded-corner hinges.
Why is hinge radius important?
Using the correct radius allows the hinge to sit flush in the mortise. The wrong radius
can cause misalignment, uneven door gaps, binding, or additional modification during
installation.
Are 3 1/2" 1/4"-radius hinges standard?
Yes. 3 1/2" hinges with a 1/4" radius are a common residential size, especially
for interior doors that were factory-mortised with rounded corners.
When should I choose radius hinges instead of square-corner hinges?
Choose radius hinges when replacing existing rounded-corner hinges or when the door and
frame are already cut for a 1/4" radius. Matching the radius ensures proper fit,
smoother operation, and a clean finished appearance.
