ASME/ANSI B16.5 Class 1500 LJ
The lap joint flange is practically identical to a slip-on flange except it has a radius at the intersection of the bore and flange face. This radius is necessary to have the flange accommodate a lap joint stub end. Normally, a lap joint flange and a lap joint stub end are mated together is an assembly system. Nominal Pipe Size Outside Diameter of Flange Thickness of Lap Joint Min. Diameter of Hub Length Through Hub Bore Corner Radius of Bore of Lapped Flange Diameter of Bolt Circle Diameter of Bolt Holes Number of Bolts Approxi-mate Weight kgs NPS O tf X Y B r W I n 1/2 120 22.3 38 32 22.9 3 82.6 22.2 4 1.69 3/4 130 25.4 44 35 28.2 3 88.9 22.2 4 2.28 1 150 28.6 52 41 34.9 3 101.6 25.4 4 3.41 1 1/4 160 28.6 64 41 43.7 5 111.1 25.4 4 3.89 1 1/2 180 31.8 70 44 50.0 6 123.8 28.6 4 5.41 2 215 38.1 105 57 62.5 8 165.1 25.4 8 9.57 2 1/2 245 41.3 124 64 75.4 8 190.5 28.6 8 13.54 3 265 47.7 133 73 91.4 10 203.2 31.8 8 17.29 4 310 54.0 162 90 116.8 11 241.3 34.9 8 ...