DIN 2635 PN40
The Welding neck flanges is normally referred to as the high hub flange. It is designed to transfer stresses to the pipe, thereby reducing high stress concentrations at the base of the flange. The welding neck flange is the best designed butt-welded flange of those currently available because of its inherent structural value. It is expensive because of the design. Pipe Flange Neck Raised face Screws Weight of a flange (7,85 Kg/dm3) Rated Diameter d1 D b k h1 d3 s r h2 d4 f Number Thread d2 Kg ISO Series 1 DIN Series 2 15 - 20 95 16 65 38 30 2 4 6 45 2 4 M 12 14 0,746 21,3 - 32 20 - 25 105 18 75 40 38 2,3 4 6 58 2 4 M 12 14 1,06 26,9 - 40 25 - 30 115 18 85 40 42 2,6 4 6 68 2 4 M 12 14 1,29 33,7 - 45 32 - 38 140 18 100 42 52 2,6 6 6 78 2 4 M 16 18 1,88 42,4 - 56 40 - 44,5 150 18 110 45 60 2,6 6 7 88 3 4 M 16 18 2,33 48,3 - 64 50 - 57 165 20 125 48 72 2,9 6 8 102 3 4 M 16 18 2,82 60,3 - 75 65 76,1 - 185 22 145 52 90 2,9 6 10 122 3 8 M 16 18 3,74 80 88,9 - 20...