Flange bolts are those type of bolts having a ridge or skirt around the bolt head. They are also know as frame bolts and are designed to provide the holding power as if a washer was installed. The skirt is the distributing agent of the entire clamping load. Pipe flange bolts are widely used in various applications, especially pipe fittings and plumbing. With their multi-feature function, they help make jobs easier and faster. Pipe flange bolts are made from a variety of types and grades to suffice for the various applications flange bolts are used.