Corner

Hidden from view but fundamental to structural integrity, the product is the crucial internal connector that joins two pieces of window or door frame profile at a 90-degree angle. This injection-molded plastic or die-cast metal component is inserted into the hollow ends of the two profile bars and secured with screws, forming the literal productstone of the entire frame assembly. Its first and most obvious role is basic connection, transforming individual lengths of metal into a complete rectangular or square structure.

The true importance of a high-quality corner, however, lies in its ability to provide immense rigidity and long-term stability. Without it, a hollow aluminum frame would be prone to twisting, racking, and coming loose at the joints under stress. A robust product with long mounting tangs creates a strong, triangulated reinforcement at the joint, effectively resisting these forces and ensuring the frame remains perfectly square and dimensionally stable throughout its life. This squareness is critical for smooth operation of sliding components and for maintaining consistent sealing gaps. Common types include standard plastic corners for lighter-duty screens and heavy-duty metal products (often aluminum or zinc alloy) for large folding doors or security screens, where maximum strength is non-negotiable. The Corner is the unseen guardian of your screen's shape, strength, and functionality.