INDUSTRY STANDARD FLANGES Class 175 – Welding Neck and Blind Flanges

Nominal
Size
NPS
Outside
Diameter
of
Flange
Thickness
of
Flange
Length
thru
Hub
Diameter Of Hub At Base Diameter Of Raised
Face
Diameter
of
Bolt
Circle
Number 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. 33.5 138 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 37.38 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 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 64 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

(1) Bore diameter to be specified by purchaser.