... , DIN2636, DIN2637,DIN2638, DIN2673BS4504, Types:Welding Neck Flange, Slip on Flange, Threaded Flange, Socket Welding Flange, Blind FlangePRESSURE GRADE ... :BS1560 : WELDING NECK FLANGE, SOCKET WELDING FLANGE, SLIP-ON BOSS FLANGE, BLIND FLANGE,SCREWED BOSS FLANGE, LAPPED FLANGE ... , 2500 Standard:BS 10 : WELDING NECK FLANGE, PLATE SLIP-ON FLANGE, SCREWED BOSS FLANGE, SLIPON BOSS FLANGE, BLIND FLANGE ...