Class 300 ASME A/SA105 ASME B16.5 Steel Flange
Class 300 A/SA105 ASME B16.5 Steel Flange
The Class 300 ASME A/SA105 ASME B16.5 Steel Flange is a durable forged carbon steel piping component designed for reliable connections in demanding industrial pressure piping systems. Manufactured from A105/SA-105 carbon steel and produced to applicable ASME B16.5 requirements, these flanges connect pipe, valves, fittings, pumps, vessels, and other industrial equipment.
ASTM A105 / ASME SA-105 Forged Carbon Steel
ASTM A105 / ASME SA-105 specifies forged carbon steel components for pressure piping applications. A105/SA-105 steel flanges provide excellent mechanical strength, toughness, and durability for use in oil and gas, petrochemical processing, refineries, power generation, chemical plants, manufacturing, utilities, and industrial process piping systems.
The Class 300 designation identifies an ASME pressure class rather than a maximum working pressure of 300 PSI. Actual allowable pressure depends on material, operating temperature, flange configuration, and applicable ASME pressure-temperature ratings.
Class 300 Steel Flange Styles
Weld Neck, Socket Weld, and Slip-On Flanges
Weld neck flanges feature a tapered hub and butt-weld connection for strong, permanent piping installations. Socket weld flanges incorporate a recessed socket that accepts the pipe before an external fillet weld is applied. Slip-on flanges slide over the pipe and are typically secured using fillet welds.
Threaded, Blind, and Lap Joint Flanges
Threaded flanges provide an internally threaded connection for compatible piping systems. Blind flanges have no center bore and are used to close piping ends or isolate sections. Lap joint flanges work with compatible stub ends and allow rotational alignment during installation.
ASME B16.5 Flange Requirements
ASME B16.5 establishes dimensional and pressure-temperature requirements for applicable pipe flanges, including flange dimensions, bolt patterns, facing dimensions, and tolerances.
When ordering a Class 300 A/SA105 ASME B16.5 steel flange, verify nominal pipe size, flange style, facing, pipe schedule or bore requirements, material specification, and service conditions for proper system compatibility.