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WELDING NECK ORIFICE FLANGES B16.36 Class 600

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 R.F. R.J. P E F r max. W
1 in. 4.88 1.44 2 2.12 1.32 3.19 ¼ 4 0.69 0.75 ¾ 3.5 R16 2 0.25 0.344 0.03 1
mm 124 36.57 50.8 53.8 33.5 81.02 6.4 17.5 19.1 15.9 88.9 50.8 6.35 8.738 0.8 25.4
1 ½ in. 6.12 1 44 2.88 2 75 1 90 3.32 ¼ 4 o:8i 0.68  3/8 4.5 R20 2.688 0.25 0.344 0.03 1
mm 155.4 36.57 73.2 69 9 48.3 84.32 6.4 20.6 22.4 19.1 114.3 68.275 6.35 8.738 0.8 25.4
2 in. 6.5 1.44 3.62 3.31 2.38 3.32 ¼ 8 0.69 0.75  3/8 5 R23 3.25 0.312 0.469 0.03 1.06
mm 165.1 36.57 91.9 84.1 60.5 84.32 6.4 17.5 19.1 15.9 127 82.55 7.925 11.913 0.8 26.9
2 ½ in. 7.5 1.44 4.12 3.94 2.88 3.44 ¼ 8 0.81 0.88 ¾ 5 88 R26 4 0.312 0.469 0.03 1.06
mm 190.5 36.57 104.6 100.1 73,2 87.37 6.4 20.6 22.4 19.1 149.35 101.6 7.925 11.913 0.8 26.9
3 in. 8.25 1.44 5 4.62 3.5 3.44  3/8 8 0.81 0.88 ¾ 6.62 R31 4.875 0.312 0.469 0.03 1.06
mm 209.6 36.57 127 117.3 88.9 87.37 9.5 20.6 22.4 19.1 168.15 123.825 7.925 11.913 0.8 26.9
4 in. 10.75 1 50 6 19 6 4.5 4 00 ½ 8 1 1  7/8 8.5 R37 5.875 0.312 0.469 0.03 1 06
mm 273.1 38.1 157 2 152.4 114.3 101.6 12.7 25.4 25.4 22.2 215.9 149.225 7.925 11.913 0.8 26 9
6 in. 14 1.88 8.5 8.75 6.63 4.62 ½ 12 1.12 1.12 1 11.5 R45 8.312 0.312 0.469 0.03 1.06
mm 355.6 47.8 215.9 222.3 168.4 117.3 12.7 28.4 28.4 25.4 292.1 211.125 7.925 11.913 0.8 26.9
8 in. 16.5 2.19 10.62 10 75 8.63 5.25 ½ 12 1.25 1.25 1 1/8 13.75 R49 10.625 0.312 0.469 0.03 1.06
mm 419.1 55.6 269.7 273.1 219.2 133.4 12.7 31.8 31.8 28.6 349.25 269.875 7.925 11.913 0.8 26.9
10 in. 20 2.5 12.75 13.5 10.75 6 ½ 16 1.38 1.38 1 ¼ 17 R53 12.75 0.312 0.469 0.03 1.06
mm 508 63.5 323.9 342.9 273.1 152.4 12.7 35.1 35.1 31.8 431.8 323.85 7.925 11.913 0.8 26.9
12 in. 22 2.62 15 15.75 12.75 6.12 ½ 20 1 38 1.38 1 ¼ 19.25 R57 15 0.312 0.469 0.03 1.06
mm 558.8 66.5 381 400.1 323.9 155.4 12.7 35.1 35.1 31.8 488.95 381 7.925 11.913 0.8 26.9
14 in. 23.75 2.75 16.25 17 14 6.5 ½ 20 1.5 1.5 1 3/8 20.75 R61 16.5 0.312 0.469 0.03 1.06
mm 603.3 69.9 412.8 431.8 355.6 165.1 12.7 38.1 38.1 35.1 527.05 419.1 7.925 11.913 0.8 26.9
16 in. 27 3 18.5 19.5 16 7 ½ 20 1.62 1.62 1 ½ 23.75 R65 18.5 0.312 0.469 0.03 1.19
mm 685.8 76.2 469.9 495.3 406.4 177.8 12.7 41.1 41.1 38.1 603.25 469.9 7.925 11.913 0.8 30.2
18 in. 29.25 3.25 21 21.5 18 7.25 ½ 20 1.75 1.75 1 5/8 25.75 R69 21 0.312 0.469 0.03 1.19
mm 743 82.6 533.4 546.1 457.2 184.2 12.7 44.5 44.5 41.3 654.05 533.4 7.925 11.913 0.8 30.2
20 in. 32 3.5 23 24 20 7.5 ½ 24 1.75 1.75 1 5/8 28.5 R73 23 0.375 0.531 0.06 1.25
mm 812.8 88.9 584.2 609.6 508 190.5 12.7 44.5 44.5 41.3 723.9 584.2 9.525 13.487 1.5 31.8
24 in. 37 4 27.25 28.25 24 8 ½ 24 2 2 1 7/8 33 R77 27.25 0.938 0.656 0.06 1.44
mm 939.8 101.6 692.2 717.6 609.6 203.2 12.7 50.8 50.8 47.6 838.2 692.15 23.82 16.66 1.5 36.57

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