The sizing accuracy of cold drawing materials of cold heading machine shall generally be determined according to the specific requirements of products and process conditions. Generally speaking, the multi station cold heading machine has lower requirements for the accuracy of reducing diameter and forced shrinking size. It is required that the total thickness of decarburized layer in the radius direction of cold drawn material shall not exceed 1-1.5% of the diameter of raw materials (the specific situation depends on the requirements of each manufacturer).

Within the allowable range of the cold heading diameter of the cold heading machine, the position of the clamp (screw in or screw out) can be adjusted according to the required anchor head size, so as to obtain the appropriate reinforcement (wire) extension allowance; Rust shall be removed and straightened within 120~130mm of the cold heading part of the reinforcement (wire);