Class 300 or 300 LBS is a pressure rating of ANSI (ASME) B16.5 or B16.47 flange standard, the full rating class of ANSI (ASME) are class 75, class 150, class 300, class 600, class 900, class 1500 and class 2500, Class 300 or 300 LBS is very popular using for ANSI (ASME) B16.5 flanges norms, this pressure flange type have slip on, weld neck, blank, threaded, socket weld and lap joint.
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