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ASME/ANSI B16.5-1996 Pipe Flanges and Flanged Fittings – Class 150 Flanges – outside and inside diameters, bolt circles, numbers and diameters of bolts for Weld neck, Threaded, Slip-on, Lap joint, Socket weld and Blind flanges.
Carbon and stainless steel qualities according ASME B16.5 Table 1A.