... 316,ocr13,CS. Size1/2"-72"Class150#, 300#, 400#, 600#, 900#, 1500#, 2500#SpecificationStainless Steel ASTM A182 ... FLANGE, BLIND FLANGE.Pressure Class: 75, 150, 300, 400, 600, 900* ASME/ANSI B16.36: (ORIFICE FLANGES) ... SP44: WELDING NECK FLANGE, BLIND FLANGE.Pressure Class: 300, 400, 600, 900* API 6A: WELDING NECK FLANGE, THREAD ... , 10000Psi, 15000Psi, 20000Psi, 25000Psi API Flange 316 Carbon Steel