The ZH1254 hinge is a three knuckle, fixed pin butt hinge based on a 125mm high leaf and using 3.25mm thick material which provides for increased weight loading. Around the standard ZH1254 hinge are variations for different door thicknesses and fixing positions as well as including projection hinges, electrical conductor, security dog bolt and pivot reinforced hinges.The standard hinge measures 125mm x 93mm x 3.25mm. It has been tested to BS EN 1935 Grade 12, maximum adjusted door weight 160kg. The recommended minimum door thickness is 44mm. CE Certificate No. 1121-CPD-AC0064. These hinges are suitable for use on fire doors: Certifire approved - CF209.