Mitered

A mitered joint, or mitred joint, is created by cutting two parts at complementary angles so their ends meet to form a corner. In woodworking, the most common version is a 45-degree cut on each piece to produce a clean 90-degree joint. The term is widely used to describe framed pieces, trim, molding, and other decorative or structural corners.

Tools and method: A miter saw, miter box, or hand saw set to the required angle is used to cut the pieces. Accurate layout, test fits, and careful clamping are essential. After mating, the joint is typically glued and may be reinforced with nails, screws, or spline keys for additional strength.

Strength and limitations: A pure miter joint relies on glue and precise angles; under load or wood movement it can open or twist. To improve rigidity, builders may add splines, backing blocks, or use a rabbeted edge to increase glue area, or switch to a different joint such as a butt or dovetail for structural frames.

Variants and terminology: Compound miters combine bevel and miter angles for non-vertical corners and decorative molding. The spelling mitre is the British variant.

Applications: Common in picture frames, door and window trim, crown molding, and cabinetry where a clean, unobtrusive corner is desired. Correct execution requires accurate angle setup, fit, and appropriate finishing to hide joints and minimize gaps.