WELDING NECK ORIFICE FLANGES B16.36 Class 2500

Nominal
Size
NPS
Outside
Diameter
of
Flange
Thickness
of
Flange
Diameter Of Raised
Face
Diameter Of Hub At Base Diameter Of Hub At Point of Welding Length
thru
Hub
Diameter Of Pressure Connection Number of
Bolt Holes
Diameter
of
Bolt
Holes
Diameter
of
Bolts
Diameter
of
Bolt
Circle
Groove Number Pitch
Diameter
Groove
Depth
Groove
Width
Radius
At Bottom
Spec.
Oval  R.H.
O C R X A Y TT P E F r max. W
1 in. 6.25 1.5 2 2.25 1.32 3.62 ¼ 4 1  7/8 4.25 R18 2.375 0.25 0.344 0.03 1
mm 158.8 38.1 50.8 57.2 33.5 91.9 6.4 25.4 22.2 108 60.325 6.35 8.738 0.8 25.4
1 ½ in. B.00 1.75 2.88 3.12 1.9 4.38 ¼ 4 1.25 1 1/8 5.75 R23 3.25 0.312 0.469 0.03 1.06
mm 203.2 44.5 73.2 79.2 48.3 111.3 6.4 31.8 28.6 146.1 82.55 7.925 11.913 0.8 26.9
2 in. 9.25 2 3.62 3.75 2.38 5 ¼ 8 1.12 1 6.75 R26 4 0.312 0.469 0.03 1.06
mm 235 50.8 91.9 95.3 60.5 127 6.4 28.4 25.4 171.5 101.6 7.925 11.913 0.8 26.9
2 ½ in. 10.5 2.25 4.12 4.5 2.88 5.62 ¼ 8 1.25 1 1/8 7.75 R28 4.375 0.375 0.531 0.06 1.19
mm 266.7 57 2 104.6 114.3 73.2 142.7 6.4 31.8 28.6 196.9 111.125 9.525 13.487 1.5 30.2
3 in. 12 2.62 5 5.25 3.5 6.62  3/8 8 1.38 1 ¼ 9 R32 5 0.375 0.531 0.06 1.19
mm 304.8 66.5 127 133.4 88.9 168.1 9.5 35.1 31.8 228.6 127 9.525 13.487 1.5 30.2
4 in. 14 3 6.19 6.5 4.5 7.5 ½ 8 1.62 1 ½ 10.75 R38 6.188 0.438 0 656 0.06 1.31
mm 355.6 76.2 157.2 165.1 114.3 190.5 12.7 41.1 38.1 273.1 157.17 11.12 16 66 1.5 33.27
6 in. 19 4.25 8.5 9.25 6.63 10.75 ½ 8 2.12 2 14.5 R47 9 0.5 0.781 0.06 1.44
mm 482.6 108 215.9 235 168.4 273.1 12.7 53.8 50.8 368.3 228.6 12.7 19.83 1.5 36.57
8 in. 21.75 5 10.62 12 8.63 12.5 ½ 12 212 2 17.25 R51 11 0.562 0 906 0.06 1.56
mm 552.5 127 269.7 304.8 219.2 317.5 12.7 53.8 50.8 438.2 279*40 14.27 ; 23.01 1 5 39.62
10 in. 26.5 6.5 12.75 14.75 10.75 16.5 ½ 12 2.62 2 ½ 21.25 R55 13.5 0.688 1.188 0.09 1.88
mm 673.1 165.1 323.9 374.7 273.1 419.1 12.7 66.5 63.5 539.8 342.9 17.47 30.17 2.28 47.75
12 in. 30 7.25 15 17.38 12.75 18.25 ½ 12 2.88 2 ¾ 24.38 R60 16 0.688 1.312 0.09 2
mm 762 184.2 381 441.5 323.9 463.6 12.7 73.2 69.9 619.3 406.4 17.47 33.32 2.28 50.8