INDUSTRY STANDARD FLANGES Class 175 – Slip-on and Blind Flanges

Nominal
Size
NPS
Outside
Diameter
of
Flange
Diameter Of Hub At Base Outside
Diameter
of
Flange
Diameter Of Hub At Base Thickness
of
Flange
Length
thru
Hub
Diameter Of Raised
Face
Diameter
of
Bolt
Circle
Number of
Bolt Holes
Diameter
of
Bolt
Holes
SOF BLIND
O X O X C C C Y R
I.D. VESSELS O.D. VESSELS I.D. VESS. O.D. VESS. I.D. VESS. O.D. VESS.
26 in. 32 28.25 31.5 27.62 1.38 1.81 1.88 2.75 29 30.5 29.88 28 0.88
mm 812.8 717.5 800.1 701.5 35.1 46 47.8 69.8 736.6 774.7 759 22.4
28 in. 34 30.25 33.5 29.62 1.38 1.94 2 2.75 31 32.5 31.88 28 0.88
mm 863.6 768.3 850.9 752.3 35.1 49.3 50.8 69.8 787.4 825 5 809.8 22.4
30 in. 36.5 32.75 35.75 31.88 1.38 2.12 2.12 2.75 33.25 35 34.12 36 0.88
mm 927.1 831.8 908 809.8 35.1 53.8 53.8 69.8 844.5 889 866.6 22.4
32 in. 38.5 34.75 37.75 33.88 1.38 2.25 2.25 2.75 35.25 37 36.12 36 0.88
mm 977.9 882.6 958.8 860.6 35.1 57.1 57.1 69.8 895.3 939.8 917.4 22.4
34 in. 41 36.75 40.25 35.88 1.75 2.38 2.38 3.38 37.38 39.25 38.38 36 1
mm 1041.4 933.4 1022.3 911.4 44.4 60.5 60.5 85.9 949.5 996.9 974.9 25.4
36 in. 43 38.75 42.25 37.88 1.75 2.5 2.5 3.38 39.38 41.25 40.38 36 1
mm 1092.2 904.3 1073.1 962.2 44.4 63.5 63.5 85.9 1000.3 1047.8 1025.7 25.4
38 in. 45.25 41 44.25 39.88 2 2.62 2.62 3.75 41.38 43.5 42.38 36 1
mm 1149.3 1041.4 1124 1013 50.8 66.5 66.5 95.3 1051.1 1104.9 1076.5 25.4
40 in. 47.25 43 46.25 41.88 2 2.75 2.75 4 43.38 45 50 44.38 40 1
mm 1200.1 1092.2 1174.8 1063 8 50.8 69.8 69.8 101.6 1101.9 1155.7 1127.3 25.4
42 in. 49.75 45 49 44.12 2.38 2.88 2.88 4.38 45.75 47.75 46.88 40 1.12
mm 1263.6 1143 1244.6 1120.6 60.5 73.2 73.2 111.3 1162.1 1212.8 1190.8 28.4
44 in. 51.75 47 51 46.12 2.38 3 3 4.38 47.75 49.75 48.88 40 1.12
mm 1314.4 1193.8 1295.4 1171.4 60.5 76.2 76.2 111.3 1212.8 1263 6 1241.6 28.4
46 in. 54 49.25 53 48.12 2.38 3.12 3.12 4.62 49.75 52 50.88 40 1.12
mm 1371.6 1250.9 1346.2 1222.2 60.5 79.2 79.2 117.3 1263.6 1320.8 1292.4 28.4
48 in. 56 55 55 50.12 2.62 3.25 3.38 4.88 51.75 54 52.88 44 1.12
mm 1422.4 1301.8 1397 1273 66.5 82.5 85.9 124 1314.4 1371.6 1343.2 28.4
50 in. 58.25 53.5 57 52.12 2.62 3.38 3.38 4.88 53.75 56.5 54.88 44 1.12
mm 1479.6 1358.9 1447.8 1323.8 66.5 85.9 85.9 124 1365.3 1435.1 1394 28.4
52 in. 60.75 55.5 59.5 54.25 3 3.5 3.62 5.38 56 58.5 57.25 44 1.25
mm 1543.1 1409.7 1511.3 1377.9 76.2 88.9 91.9 136.7 1422.4 1485 9 1454.1 31.8
54 in. 63 57.75 61.5 56.25 3 3.62 3.62 5.38 58 60.75 59.25 44 1.25
mm 1600.2 1466.8 1562.1 1428.8 76.2 91.9 91.9 136.7 1473.2 1543.1 1504.9 31.8
60 in. 69 63.75 67.5 62.25 3.12 4 4 5.88 64 6i.fi 65.25 48 1.25
mm 1752.6 1619.3 1714.5 1581.1 79.2 101.6 101.6 149.4 1625.6 1695.4 1657.3 31.8
66 in. 75 69.75 73.5 68.5 4 4.38 4.38 6.88 70 72.75 71.25 56 1.25
mm 1905 1771.6 1866.9 1739.9 101.6 111.3 111.3 174.8 1778 1847.8 1809.8 31.8
72 in. 81 75.75 80 00 74.5 5 5 5 8 76.5 78.75 77.75 64 1.25
mm 2057.4 1924.1 2032 0 1892.3 127 127 127 203.2 1943.1 2000.3 1974.8 31.8

(1) Bore diameter to be specified by purchaser.