Manufacturing Standards of ASTM A182 Flanges ASME/ANSI B16.5 Blind Flange, High Hub Blind Flange, Slip on Flange, Welding Neck Flange, Socket Weld Flange, Ring Type Joint Flange, Lap Joint Flange, Threaded Flange PRESSURE CLASS 150, 300, 400, 600, 900, 1500, 2500 ASME/ANSI B16.47 Blind Flange [Series A & B],Welding Neck Flange PRESSURE CLASS 75, 150, 300, 400, 600, 900 ASME/ANSI B16.36 Orifice Flange PRESSURE CLASS 300, 400, 600, 900, 1500, 2500 BS 4504 SEC 3.1 Plate Flange, Loose Plate Flange, Loose Plate With Weld Neck Flange, Blank Flange, Welding Neck Flange, Hubbed Slip on Flange, Hubbed Threaded Flange, Lapped Pipe End Flange, PRESSURE CLASS PN 2.5 TO PN 40 BS 4504[PART 1] Plate Flange, Loose Plate With Weld On Plate Collar, Blank Flange, Welding Neck Flange, Hubbed Slip-On Hubbed Threaded, PRESSURE CLASS PN 2.5 TO PN 400 BS 1560 BOSS Plate Flange, Loose Plate With Weld On Plate Collar, Blank Flange, Welding Neck Flange, Hubbed Slip-On Hubbed Threaded, PRESSURE CLASS 150, 300, 400, 600, 900, 1500, 2500