Grade 13 Ball Bearing Hinge, Square (Max Load 120kg). The most popular type of door hinge on the market today. These are a perfect choice for when you have doors of 40mm or 44mm firecheck, internal or external. They have a CE mark & are Certifire tested. Suitable for industrial, commercial & domestic use. Ball bearing hinges have always been very popular for their smooth operation, durability, long lasting design & ability to carry heavier loads than washered hinges. For standard internal residential doors a pair of hinges is adequate; however fitting 3 hinges per door has its advantage...