Screw Fastener is a kind of mechanical parts used for fastening connection and widely used.it is characterized by a wide variety of specifications,performance and use of different, and standardization,generalization is also very high,so the existing national standard of a class of Fasteners known as standard Fasteners.Hexagon socket button head cap screws have a low profile dome head that provides an aesthetically pleasing appearance. Flange Bolts is a form of threaded Fastener with an external male thread.Serration with hot dip galvanized finish treatment .The Flange Bolts is an integral Bolt consisting of a hex head and a flange (the gasket under the hex and the hex fixed as one) and a screw (the cylinder with external thread). It shall be matched with a Nut for fastening the parts connected with two through holes. The specification of Stainless Steel Fastener: Product name Hex Socket Pan Head Screw…