The hinge core is the main part of the hinge and the hinge, through which the left and right pieces of the hinge are stringed together. The hinge core and the two left and right pages of the hinge are on the same axis, and the pages rotate concentrically around this axis. Therefore, the quality of the hinge core will directly affect the quality of the entire hinge. A high-quality hinge core must match the concentric shaft holes of the left and right sheets accurately. The fit includes high-precision matching installation on the diameter of the hinge shaft core and the concentric hole of the left and right sheets. The tolerance level generally used is plus or minus 3-5 wires. At the same time, the fit also refers to the smoothness and length matching of the contact surfaces of the hinge core and the left and right pages of the hinge. Smoothness mainly requires the surface of the hinge core to be smooth.

Generally used materials are: iron, stainless steel, copper, etc. Surface treatment: generally galvanized.

Process: In order to achieve the accuracy requirements of the radial dimension of the hinge core and the smooth surface, the hinge core must generally be made of cold drawn round iron material to ensure the radial dimension and surface requirements.