Dimensions of a Threaded Flange

Pressure Class

• Pressure class is one of the parameters for threaded flanges, ranging from 150 to 2,500. Applications determine what pressure-class flange is required based upon the expected pressure per square inch. Composition of the flange and the temperature of the application are two components that are part of determining the pressure class of a flange.

Pipe Diameter

• The diameter of the pipe that can be used with the flange directly affects the dimensions of the flange. With pipe sizes ranges from 1/2 inch to 24 inches, the overall diameter of a flange can range from 89 mm to 610 mm.

Composite

• The composite of a threaded flange affects its assigned pressure class. Flanges can be made out of stainless steel, carbon steel, alloy steel, nickel alloys and copper alloys.

Dimensions of a Threaded Flange

• The critical dimensions of a threaded flange are the overall diameter, the flange thickness, the overall length, the length of the threaded opening, the hub diameter, the face diameter, the number of bolt holes and their diameter, and the distance from the center of one bolt hole to the center of the bolt hole on the opposing side.