Class 125 Forged Carbon Steel Weld Neck, Raised-Face Flange for Schedule 40 Pipe

Class 125 Forged Carbon Steel Weld Neck Raised-Face Flange for Schedule 40 Pipe

The Class 125 Forged Carbon Steel Weld Neck Raised-Face Flange for Schedule 40 Pipe provides a strong, permanent connection for commercial and industrial piping systems. Its forged carbon steel construction, tapered weld neck, and raised-face sealing surface deliver excellent strength, durability, and dependable performance when connecting compatible Schedule 40 piping to valves, equipment, and other flanged components.

Forged Carbon Steel Construction

Manufactured from forged carbon steel, this Class 125 weld neck flange provides excellent mechanical strength, toughness, and long-term durability. Forged steel flanges are commonly used in industrial processing, manufacturing, utilities, mechanical piping, water systems, power generation, chemical processing, and general industrial piping applications.

Forging produces a strong, uniform flange body capable of handling demanding piping loads when properly specified and installed. Material, temperature, process media, and environmental conditions should always be considered when selecting the appropriate flange.

Weld Neck Design for Schedule 40 Pipe

A weld neck flange features a long, tapered hub that creates a gradual transition between the flange body and connecting pipe. The flange is butt welded directly to the pipe, producing a permanent connection while helping distribute piping and mechanical stresses through the tapered hub.

For Schedule 40 pipe, the flange bore can be selected or machined to correspond with the pipe wall thickness and inside diameter, helping provide proper internal alignment through the welded connection.

Raised-Face Flange Construction

The raised-face (RF) design incorporates an elevated gasket seating surface that concentrates bolting force over the gasket area. A compatible mating flange and properly selected gasket are essential for reliable sealing performance.

Class 125 Flange Considerations

The Class 125 designation should be verified against the applicable dimensional and pressure standard, as Class 125 is commonly associated with standards and material families different from standard ASME B16.5 forged-steel pressure classes.

When ordering, verify nominal pipe size, Schedule 40 bore, actual flange class, forged carbon steel material, raised face, dimensional standard, bolt pattern, gasket, bolting, welding requirements, and service conditions.