he CE grade 13 butt hinge is for use on heavy duty doors up to 120kg. It has been developed with a five knuckle ball bearing hinge, with the ball bearings offering reduced friction and increased durability. The template is drilled for consistency and accuracy. This is an ideal hinge for doors with door closers. It has been tested to EN 1935 and is suitable for FD30 and FD60 fire doors.