Fang Sheng Screw Co., Ltd (YFS) is one of the world's manufactures of socket screws, Founded in 1979, YFS offers a broad line of quality Socket products and services YFS has grown into the world's Premier global provider of valued-based Socket head products. YFS products are manufactured from high tensile Alloy Steel, Class 12.9 and ASTM A574 for industrial machinery, electric appliances, automotive vehicles, military equipment and may other industrial products. YFS offers the highest quality fastener in the World, meeting all the manufacturing standard globally.