Richelieu 4821-B 3-1/2 X 3-1/2 Ball Bearing Square Mortise Door Hinge – Black

Features: Includes two hinges (2) in each order Features precisely machined square corners Tested for residential and commercial strength application Features a removable pin allowing you to easily remove your door without having to uninstall the hinges. Packaged with 6 wood screws and 6 machine screws for simple out of the box installation Constructed with 6 screw holes in an arc arrangement for maximum mounting strength Product Technologies: Ball Bearing Hinge: Ball bearing hinges are designed to handle the extra stress brought on by high traffic doorways. The greased bearings reduce the rotational friction extending the life of a hinge in heavy use situations. These hinges tend to be more durable than standard or plain bearing hinges. Material Type: Steel is cheap strong and durable making it a favorite for hinges of all types despite it being slightly more prone to rusting than solid brass or stainless steel. Mortise Hinges: Mortise door hinges mount flush with the surface of your door providing maximum strength with the least interference with door functionality. It is recommended that three hinges be used on doors up to and including 7-1/2 feet with one additional hinge for each additional 2-1/2 feet. Be sure to check your current hinges before making a purchase. Specifications: Height: 3.5 Width: 3.5 Material: Steel Mounting Type: Mortise Gauge: 0.125 Number of Knuckles: 6 Number of Screw Holes: 5.