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Industry Standard Welding Neck – Class 175

Industry Standard Welding Neck Flanges

Class 175

NPS   Outside Diameter of Flange Thickness of Flange   Length thru Hub Diameter of Hub at Base Diameter of Raised Face Diameter of Bolt Circle No. of Bolt Holes Diameter of Bolt Holes
      WNF BLIND            
A   O C C Y X R      
26 in. 31.5 1.38 1.81 3.38 27.63 29 29.88 28 0.88
  mm 800.1 35.1 46 85.9 701.8 736.6 759   22.4
28 in. 33.5 1.38 1.88 3.38 29.63 31 31.88 28 0.88
  mm 850.9 35.1 47.8 85.9 752.6 787.4 809.8   22.4
30 in. 35.75 1.38 2 3.63 31.88 33.25 34.13 36 0.88
  mm 908 35.1 50.8 92.2 809.8 844.5 866.9   22.4
32 in. 37.75 1.38 2.12 3.63 33.88 35.25 36.13 36 0.88
  mm 958.8 35.1 53.8 92.2 860.6 895.3 917.7   22.4
34 in. 40.25 1.5 2.25 3.75 35.88 38.38 38.38 36 1
  mm 1022.3 38.1 57.1 95.3 911.4 949.5 974.9   25.4
36 in. 42.25 1.5 2.38 3.75 37.88 39.38 40.38 36 1
  mm 1073.1 38.1 60.5 95.3 962.2 1000.3 1025.7   25.4
38 in. 44.25 1.75 2.5 4.13 39.88 41.38 42.38 36 1
  mm 1124 44.4 63.5 104.9 1013 1051.1 1076.5   25.4
40 in. 46.25 1.75 2.62 4.13 41.88 43.38 44.38 40 1
  mm 1174.8 44.4 66.5 104.9 1063.8 1101.9 1127.3   25.4
42 in. 49 2 2.75 4.5 44.13 45.75 46.88 40 1.13
  mm 1244.6 50.8 69.8 114.3 1120.9 1162.1 1190.8   28.7
44 in. 51 2 2.88 4.5 46.13 47.75 48.88 40 1.13
  mm 1295.4 50.8 73.2 114.3 1171.7 1212.8 1241.6   28.7
46 in. 53 2 3 4.5 48.13 49.75 50.88 40 1.13
  mm 1346.2 50.8 76.2 114.3 1222.5 1263.6 1292.4   28.7
48 in. 55 2.25 3.12 4.88 50.13 51.75 52.88 44 1.13
  mm 1397 57.1 79.2 124 1273.3 1314.4 1343.2   28.7
50 in. 57 2.25 3.25 4.88 52.13 53.75 54.88 44 1.13
  mm 1447.8 57.1 82.5 124 1324.1 1365.3 1394.3   28.7
52 in. 59.5 2.63 3.38 5.38 54.25 56 57.25 44 1.25
  mm 1511.3 66.8 85.9 136.7 1377.9 1422.4 1454.1   31.8
54 in. 61.5 2.63 3.5 5.38 56.25 58 59.25 44 1.25
  mm 1562.1 66.8 88.9 136.7 1428.8 1473.2 1504.9   31.8
60 in. 67.5 2.75 3.88 5.75 62.25 61 65.25 48 1.25
  mm 1714.5 69.8 98.6 146 1581.1 1625.6 1657.3   31.8
66 in. 73.5 3.13 4.25 6.13 68.5 70 71.25 56 1.25
  mm 1866.9 79.5 107.9 155.7 1739.9 1778 1809.8   31.8
72 in. 80 3.63 4.5 6.63 74.5 76.5 77.75 64 1.25
  mm 2032 92.2 114.3 168.4 1892.3 1943.1 1974.8   31.8
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