Sn-plating Custom Made Die Casting Zink Thread Connector Housing Pass Reflow Test. With the development of the economy and society, there is more and more demand for automobiles. In other words, the related industry, like zinc alloy and aluminum alloy die-casting industry will also flourish. The circle die-casting components with precision dimensions, but there is no need to do surface treatment according to its application. However, as a customized Chinese die casting manufacturer, Enchuang can provide different choice surface treatments.