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Industrial hinges are pieces of hardware that attach to doors, gates, and similar mechanical assembly components. A bearing that connects two objects together, such as a door and a door frame, it allows limited movement that may be adjusted manually or by another power source. Industrial stainless steel and brass hinges are often used for their resistance to corrosion or where a specific finish is desired. Steel hinges are suitable for applications requiring strength, but they are vulnerable to rust and may have an additional coating to protect against it. Both finished and unfinished styles are available to match existing hardware, and those with a finish may be polished, plated, or galvanized for extended life. Hinge designs vary depending on the application and performance requirements. They include strap, concealed, pivot, spring, weld-on, butt, overlay, knife, T-, pin, and stop hinges. While most are powered manually, heavy duty electric hinges are available for certain styles. Latch hinges allow the mechanism to engage and disengage as needed for quick adjustment. Common dimensions include leaf height, width, and thickness, overall width, and projection or pin diameter. Some industrial hinges may also specify knuckle length and the range of motion in degrees.