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WELDING NECK ORIFICE FLANGES B16.36 Class 1500

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. 5.88 1.5 2 2.06 1.32 3.25 ¼ 4 1  7/8 4 R16 2 0.25 0.344 0.03 1
mm 149.4 38.1 50.8 52.3 33.5 82.6 6.4 25.4 22.2 101.6 50.8 6.35 8.738 0.8 25.4
1 ½ in. 7 1 50 2.88 2.75 1.9 3.5 ¼ 4 1.12 1 4.88 R20 2.688 0.25 0.344 0.03 1
mm 177.8 381 73.2 69.9 48.3 88.9 6.4 28.4 25.4 124 68.275 6.35 8.738 0.8 25.4
2 in. 8.5 1.5 3.62 4.12 2.38 4 ¼ 8 1  7/8 6.5 R24 3.75 0.312 0.469 0.03 1.06
mm 215.9 38.1 91.9 104.6 60.5 101.6 6.4 25.4 22.2 165.1 95.25 7.925 11.913 0.8 26.9
2 ½ in. 9.62 1.62 4.12 4 88 2.88 4.12 ¼ 8 1.12 1 7.5 R27 4.25 0.312 0.469 0.03 1.06
mm 244.3 41.1 104.6 124 73.2 104.6 6.4 28.4 25.4 190.5 107.95 7.925 11.913 0.8 26.9
3 in. 10.5 1.88 5 5.25 3.5 4.62  3/8 8 1.25 1 1/8 8 R35 5.375 0.312 0.469 0.03 1.06
mm 266.7 47.8 127 133.4 88.9 117.3 9.5 31.8 28.6 203.2 136.525 7.925 11.913 0.8 26.9
4 in. 12.25 2.12 6.19 6.38 4.5 4.88 ½ 8 1.38 1 ¼ 9.5 R39 6.375 0.312 0.469 0.03 1.06
mm 311.2 53.8 157.2 162.1 114.3 124 12.7 35.1 31.8 241.3 161.925 7.925 11.913 0.8 26.9
6 in. 15.5 3.25 8.5 9 6.63 6.75 ½ 12 1.5 1 3/8 12.5 R46 8.312 0.375 0.531 0.06 1.12
mm 393.7 82.6 215.9 228.6 168.4 171.5 12.7 38.1 34.9 317.5 211.125 9.525 13.487 1.5 28.4
8 in. 19 3.62 10.62 11.5 8.63 8.38 ½ 12 1.75 1 5/8 15.5 R50 10.625 0.438 0.656 0.06 1.31
mm 482.6 91.9 269.7 292 1 219.2 212.9 12.7 44.5 41.3 393.7 269 87 11.12 16.66 1.5 33.27
10 in. 23 4.25 12.75 14.5 10.75 10 ½ 12 2 1 7/8 19 R54 12.75 0.438 0.656 0.06 1.31
mm 584.2 108 323.9 368.3 273.1 254 12.7 50.8 47.6 482.6 323.85 11.12 16.66 1.5 33.27
12 in. 26.5 4.88 15 17.75 12.75 11.12 ½ 16 2 1/8 2 22.5 R58 15 0.562 0.806 0.06 1.56
mm 673.1 124 381 450.9 323.9 282.4 12.7 53.8 50.8 571.5 381 14.27 20.47 1.5 39.62
14 in. 29.5 5.25 16.25 19.5 14 11.75 ½ 16 2.38 2 ¼ 25 R63 16.5 0.625 1.062 0.09 1.75
mm 749.3 133.4 412.8 495.3 355.6 298.5 12.7 60.5 57.2 635 419.1 15.87 26.97 2.28 44.45
16 in. 32.5 5.75 18.5 21.75 16 12.25 ½ 16 2.62 2 ½ 27.75 R67 18.5 0.688 1.188 0.09 2
mm 825.5 146.1 469.9 552.5 406.4 311.2 12.7 66.5 63.5 704.9 469.9 17.47 30.17 2.28 50.8
18 in. 36 6.38 21 23.5 18 12.88 ½ 16 2.88 2 ¾ 30.5 R71 21 0.688 1.188 0.09 2
mm 914.4 162.1 533.4 596.9 457.2 327.2 12.7 73.2 69.9 774.7 533.4 17.47 30.17 2.28 50.8
20 in. 38.75 7 23 25.25 20 14 ½ 16 3.12 3 32.75 R75 23 0.688 1.312 0.09 2.12
mm 984.3 177.8 584.2 641.4 508 355.6 12.7 79.2 76.2 831.9 584.2 17.47 33.32 2.28 53.84
24 in. 46 8 27.25 30 24 16 ½ 16 3.62 3 ½ 39 R79 27.25 0.812 1.438 0.09 2.31
mm 1168.4 203.2 692.2 762 609.6 406.4 12.7 91.9 88.9 990.6 692.15 20.62 36.52 2.28 58.67

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