Spring wire shall have high tensile strength, elastic limit, endurance and fatigue strength, and be resistant to shock and oscillation. The objectives of strength and endurance, especially the prevention of alteration cracks, are key to the consumption of spring steel wires. The inner and outer quality of wire rod directly affect the function of steel wire.

The surface coating of galvanized wire can be seen whether the quality of galvanized wire is good or not. If the strength of zinc attached to the wire is very poor, then this galvanized wire do not buy, because this galvanized wire must be poor galvanized wire. High quality galvanized wire in general, the zinc layer attached to the surface of the wire is relatively thick, so when we buy galvanized wire, as long as we look at the thickness of the zinc layer, we can generally judge the quality of galvanized wire.