309 Ball bearing butt hinges A ball bearing hinge has ball bearings in the knuckle of the hinge to reduce friction and create a permanently lubricated surface area. This makes opening and closing a door consistently easier, smoother and quieter, plus it helps the door to swing smoothly with less force required. Most internal doors will require two hinges to function. For doors with added security requirements and/or containing door closers, three hinges will be required to help prevent forced entry. Range benefits I deal for low and medium frequency used doors in residential and light commercial S trength and durability of ball bearing butt hinges are suitable for large, heavy doors B all bearings located in the knuckles of a hinge provide a smooth action, excellent strength and durability
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