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Tonnage in die casting refers to the amount of clamping force that is needed to hold the die closed while molten metal is injected into the cavity. This clamping force is essential to prevent the die from opening under the pressure of the injected metal, which can reach several thousand psi. The tonnage required is usually expressed in tons and is determined by various factors, including the size and shape of the part, the type of metal being cast, and the injection pressure.