blind mitered corner lap joint

The blind bridle joint is an L-joint that uses a tenon with lateral cheeks that engages into a corresponding slot. The connection remains invisible from the outside and functions without additional wooden fasteners.
This joint belongs to the group of tenon joints and shows similarities with the open bridle joint and Japanese Bridle Joints. Comparable principles can be found in concealed tenon connections and high-quality furniture joints with invisible structures.
The tenon is formed with lateral cheeks (shoulders) that engage into a correspondingly milled or chiseled slot. The characteristic feature is the concealed execution, where the connection is not visible from the outside. The cheeks prevent lateral movement and increase the contact area.
The concealed execution offers both structural and aesthetic advantages. The cheeks increase rigidity and load transmission, while the invisible design enables a clean surface without visible connection elements. The joint is self-locking and effectively resists tensile forces.
Traditionally, this joint is used in high-quality furniture construction, window and door constructions, and sill connections. It is particularly suitable for applications where both structural strength and aesthetic requirements must be met, such as in visible wall constructions.
Manufacturing requires precise craftsmanship. The slot is worked out using chisels or milling, while the tenon with its cheeks is manufactured to exact fit. Tolerances must be kept minimal to ensure a tight fit.