WELDING NECK ORIFICE FLANGES B16.36 Class 900

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.
mm
1 ½ in.
mm
2 in. Sizes 1” thru 2 ½” are identical to class 1500
mm
2 ½ in.
mm
3 in. 9.5 1.5 5 5 3.5 4 3/8 8 1  7/8 7.5 R31 4.875 0.312 0.469 0.03 1.06
mm 241.3 38.1 127 127 88.9 101.6 9.5 25.4 22.2 190.5 123.825 7.925 11.913 0.8 26.9
4 in. 11.5 1.75 6.19 4.5 4.5 ½ 8 1.25 1 1/8 9.25 R37 5.875 0.312 0.469 0.03 1.06
mm 292.1 44.5 157.2 158.8 114.3 114.3 12.7 31.8 28.6 235 149.225 7.925 11.913 0.8 26.9
6 in. 15 2.19 8.5 9.25 6.63 5.5 ½ 12 1.25 1 1/8 12.5 R45 8.312 0.312 0.469 0.03 1.06
mm 381 55.6 215.9 235 168.4 139.7 12.7 31.8 28.6 317.5 211.125 7.925 11.913 0.8 26.9
8 in. 18.5 2.5 10.62 11.75 8.63 6.38 ½ 12 1.5 1 3/8 15.5 R49 10.625 0.312 0.469 0.03 1.06
mm 469.9 63.5 269.7 298.5 219.2 162.1 12.7 38.1 34.9 393.7 269.875 7.925 11.913 0.8 26.9
10 in. 21.5 2.75 12.75 14.5 10.75 7.25 ½ 16 1.5 1 3/8 18.5 R53 12.75 0.312 0.469 0.03 1.06
mm 546.1 69.9 323.9 368.3 273.1 184.2 12.7 38.1 34.9 469.9 323.85 7.925 11.913 0.8 26.9
12 in. 24 3.12 15 16.5 12.75 7J8 ½ 20 1.5 1 3/8 21 R57 15 000 0.312 0.469 0.03 1.06
mm 609.6 79.2 381 419.1 323.9 200.2 12.7 38.1 34.9 533.4 381 7 925 11.913 0.8 26.9
14 in. 25.25 3.38 16.25 17.75 14 8.38 ½ 20 1.62 1 ½ 22 R62 16.5 0.438 0.656 0.06 1.31
mm 641.4 85.9 412.8 450.9 355.6 212.9 12.7 41.1 38.1 558.8 419.1 11.12 16.66 1.5 33.3
16 in. 27.75 3.5 18.5 20 16 8.5 ½ 20 1.75 1 5/8 24.25 R66 18.5 0.438 0.656 0.06 1.44
mm 704.9 88.9 469.9 508 406.4 215.9 12.7 44.45 41.27 615.95 469.9 11.12 16.66 1.5 36.6
18 in. 31 4 21 22.25 18 9 ½ 20 2 1 7/8 27 R70 21 0.5 0.781 0.06 1.56
mm 787.4 101.6 533.4 565.2 457.2 228.6 12.7 50.8 47.6 685.8 533.4 12.7 19.83 1.5 39.6
20 in. 33.75 4.25 23 24.5 20 9.75 ½ 20 2.12 2 29.5 R74 23 0.5 0.781 0.06 1.56
mm 857.3 108 584.2 622.3 508 247.7 12.7 53.8 50.8 749.3 584.2 12.7 19.83 1.5 39.6
24 in. 41 5.5 27.25 29.5 24 11.5 ½ 20 2.62 2 ½ 35.5 R78 27.25 0.625 1.062 0.09 1.88
mm 1041.4 139.7 692.2 749.3 609.6 292.1 12.7 66.5 63.5 901.7 692.15 15.87 26.97 2.28 47.8