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Flange diameters, thickness, bolt circles, numbers and diameter of bolts for ASME/ANSI B16.15 – Cast Bronze Threaded Fittings – 300 lb Bronze Flanges with plain faces.
ASME/ANSI B16.15 – Cast Bronze Threaded Fittings – 300 lb bronze flanges have plain faces with two concentric gasket retaining grooves between the port and the holes.