Fasteners are also known as "Standard Part". Its function is to fasten two or more products together.There are many types of fasteners, usually including Fully Bolts, Thread Studs, Heavy Nuts, Screws, Flat Washers, Spring Washers etc.Due to its wide range of application so which already win a highly Standardized Series of Mechanical Parts. Fasteners used in our Valve and Flange products to connect Pipe. The Fields of use including Petroleum, Gas Oil, Chemical, Energy, Construction ect. Its Characteristics are easy to install, various types, Fastener is Standardized and Universal. Therefore fasteners have been recognized as a National Standard Parts.