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Cold forging, also known as cold volume forging, is a manufacturing process as well as a processing method. Basically the same as stamping process, cold forging process is composed of materials, molds and equipment. But the material in stamping processing is mainly plate, and the material in cold forging processing is mainly disk wire. Japan (JIS) called cold forging (cold forging), China (GB) called cold heading, outside screw factory like to call head.

Steel structure bolt in use will be different according to the strength of the different use of the place is also different, so how to judge the strength grade? Steel structure bolts strength grade: The strength grade of steel structure bolt for steel structure connection is 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, etc. The strength grade of steel structure bolt consists of two parts of numbers, which respectively represent the nominal tensile strength value and flexion ratio of steel structure bolt material.

For screw fasteners production, surface treatment is a process with the inevitable, many vendors in inquiring about the screw fasteners, way of surface treatment, the standard network according to the summarized information about the surface of the screw fasteners common processing ways there are eight kinds of forms, such as: black (blue), phosphating, hot dip zinc, dacromet, electric galvanized, chrome plating, nickel and zinc impregnation. The fastener screw surface treatment is through a certain method to form a covering layer on the surface of the workpiece, its purpose is to make the surface of the product beautiful, anti-corrosion effect.