How to choose 2bb and 4bb hinges?

  Hinge, as the essential hardware of the door, is also one of the important hardware accessories of the door. When we choose the hinge, professional product names such as 2bb hinge and 4bb hinge will appear. In fact, "bb" means bearing , Normal doors only need 2bb hinges, while heavier doors can choose 4bb hinges. As one of the important hardware of the door, the quality of the hinge can determine the number of times of opening and closing of the door and the service life. Generally speaking, the hinge made of stainless steel 304 should be selected. The heavier the product weight, the better the quality of the hinge. The RDH-02 stainless steel 304 hinge of Lelang Hardware is available in various specifications, and the surface treatment can be customized in other colors.