Grade 13 Ball Bearing Hinge (Max Load 120kg) Ball bearing hinges have always been very popular for their smooth operation, durability, long lasting design and ability to carry heavier loads than washered hinges. They carry a CE mark and are Certifire tested. BS EN 1935 rated. This substantial premium hinge carries a 25 year mechanical guarantee. Suitable for standard internal residential doors a pair of hinges is adequate;? however fitting 3 hinges per door has its advantages. It will look aesthetically pleasing and from a practical viewpoint it helps spread the load evenly and will help to overcome twisting or warping. This can sometimes happen to doors over a period of time where heat and moisture are a factor. Suitable for all domestic, commercial and industrial use.