Class 125 Gray Iron Castings Hot Dipped Galvanized Companion, Flat-Face Flange
Class 125 ASTM A126 Gray Iron Hot-Dipped Galvanized Companion Flat-Face Flange
The Class 125 Gray Iron Castings Hot-Dipped Galvanized Companion Flat-Face Flange manufactured to ASTM A126 and ASME B16.1 requirements provides a durable, corrosion-resistant connection for commercial and industrial piping systems. Combining gray cast iron construction with a protective galvanized coating, this companion flange is well suited for compatible Class 125 piping, valves, pumps, fittings, and mechanical equipment.
ASTM A126 Gray Iron Construction
ASTM A126 covers gray iron castings intended for valves, flanges, and pipe fittings. Gray cast iron provides good compressive strength, dimensional stability, machinability, and vibration-dampening characteristics for appropriate piping applications.
These Class 125 flanges are commonly used in water distribution, HVAC, mechanical piping, utility systems, pump installations, manufacturing facilities, fire protection, and general industrial piping.
Hot-Dipped Galvanized Corrosion Protection
The hot-dip galvanizing process applies a protective zinc coating to the gray iron flange, helping protect the underlying metal against atmospheric corrosion caused by moisture, humidity, weather exposure, and many outdoor environments.
Galvanized coating compatibility should be verified for the process fluid, operating temperature, and specific service environment.
Companion Flat-Face Flange Design
A companion flange provides a mating flanged connection between piping and compatible Class 125 valves, pumps, fittings, or equipment. Depending on the specific product configuration, the pipe connection may be threaded or use another specified connection method.
The flat-face (FF) design provides a gasket seating surface extending across the flange face, helping distribute gasket and bolting loads over a broad area.
ASME B16.1 establishes dimensional and pressure-temperature requirements for applicable gray iron pipe flanges and flanged fittings.
Selecting a Class 125 Galvanized Companion Flange
When ordering, verify nominal pipe size, ASTM A126 material grade, Class 125 rating, companion flange connection type, flat-face configuration, hot-dipped galvanized finish, ASME B16.1 requirements, bolt pattern, gasket, bolting, operating temperature, and mating equipment compatibility.