... Flange:Welding Neck Flanges, Slip-on Flanges, Blind , Plate Flanges, Socket Weld Flanges,Threaded Flanges, Lap Joint Flanges, Orifice Flanges, Figure 8 ... 4504, BS3293PRESSURE GRADE:PN2.5,PN6,PN10,PN16,PN25,PN40 4. ISO Flanges STANDARD: ISO 7005-1PRESSURE GRADE:PN2.5,PN6 ...