The Best tin coated copper wire refers to the wire harness manufacturing process in which a layer of tin is plated on the surface of the wire conductor to improve the performance of the wire. Tin forms a thin film of tin dioxide in the air to prevent further oxidation. Tin and halogen can also form a thin film with similar effects. Therefore, the Best tin coated copper wire not only has good corrosion resistance, but also has certain strength and hardness, good formability and easy welding, the tin layer is non-toxic and tasteless, can prevent iron from dissolving into the package, and the surface is bright. Printing pictures can beautify the goods.

The Best tin coated copper wire is widely used in wire harness because of its high cost performance ratio. If the bare yellow copper wire is used as the harness, the normal work and service life of the harness will be affected because the brass is easily oxidized and corroded by the humid air. The brass wire is coated with a waterproof "tin coat", i.e. tinned copper wire. The electrode action between the tin coating and the brass core can effectively improve the oxidation resistance of the wire harness and prolong the service life of the brass wire harness in the high salinity environment. The tin layer of the Best tin coated copper wire has lower hardness and better processing performance than the bare copper wire. The contact between the brass harness terminal and the wire conductor is more sufficient after crimping, and the contact resistance is small. The temperature rise at the crimping part of the brass harness terminal is slow.

At present, the Best tin coated copper wire are mainly used for outgoing lines of electronic components, communication cables, light-emitting diodes, bakelite frames, high and low frequency transformer pin holders, relay pins, micro motors, computer pins, connectors, various types of guide pins, etc.