Boltex Reference Manual

AWWA Standard

AWWA Standard ANSI/AWWA C207

Slip-On & Blind Flanges Classes B, D, and E

Nominal Size NPS Outside Diameter of  Flange Inside Diameter of Flange THICKNESS OF FLANGE Length Thru Hub Diameter of Hub at Base Diameter of Bolt Circle Number of Bolt Holes Diameter of Bolt Holes
Slip-on Blind Class B(1) Blind Class D(2) Blind Class E(3)
O B C C C C Y X
26 in. 34.25 26.19 1.00 … … … 1.75 28.5 31.75 24 1.38
  mm 870.0 665.22 25.4 … … … 44.5 723.9 806.5 . 35.1
28 in. 36.50 28.19 1.00 … … … 1.75 30.50 34.00 28 1.38
  mm 927.10 716.02 25.4 … … … 44.5 774.70 863.6 . 35.1
30 in. 38.75 30.19 1.00 1.530 2.003 2.875 1.75 32.50 36.00 28 1.38
  mm 984.3 766.82 25.4 38.86 50.88 50.88 44.5 825.5 914.4 . 35.1
32 in. 41.75 32.19 1.12 … … … 1.75 34.75 38.50 28 1.62
  mm 1060.5 817.62 28.4 … … … 44.5 882.7 977.9 . 41.1
34 in. 43.75 34.19 1.12 … … … 1.75 36.75 40.50 32 1.62
  mm 1111.3 868.42 28.4 … … … 44.5 933.5 1028.7 . 41.1
36 in. 46.00 36.19 1.12 1.834 2.369 3.344 1.75 38.75 42.75 32 1.62
  mm 1168.4 919.22 28.4 46.58 60.17 84.93 44.50 984.3 1085.9 . 41.1
38 in. 48.75 38.19 1.12 … … … 1.75 40.75 45.25 32 1.62
  mm 1238.3 970.02 28.4 … … … 44.5 1035.1 1149.4 . 41.1
40 in. 50.75 40.19 1.12 … … … 1.75 43.00 47.25 36 1.62
  mm 1289.1 1020.82 28.4 … … … 44.5 1092.2 1200.2 . 41.1
42 in. 53.00 42.19 1.25 2.084 2.725 3.789 1.75 45.00 49.50 36 1.62
  mm 1346.2 1071.62 31.8 52.93 69.21 96.24 44.5 1143.0 1257.3 . 41.1
44 in. 55.25 44.19 1.25 … … … 2.25 47.00 51.75 40 1.62
  mm 1403.4 1122.42 31.8 … … … 57.2 1193.8 1314.5 . 41.1
46 in. 57.25 46.19 1.25 … … … 2.25 49.00 53.75 40 1.62
  mm 1454.2 1173.22 31.8 … … … 57.2 1244.6 1365.3 41.1
48 in. 59.50 48.19 1.375 2.341 3.067 4.246 2.50 51.00 56.00 44 1.62
  mm 1511.3 1224.02 34.92 59.46 77.90 107.85 63.5 1295.4 1422.4 . 41.1
50 in. 61.75 50.19 1.375 … … … 2.50 53.00 58.25 44 1.88
  mm 1568.5 1274.82 34.92 … … … 63.5 1346.2 1479.6 47.8
52 in. 64.00 52.19 1.375 … … … 2.50 55.00 60.50 44 1.88
  mm 1625.6 1325.62 34.92 … … … 63.5 1397.0 1536.7 . 47.8
54 in. 66.25 54.19 1.375 2.634 3.431 4.776 2.50 57.00 62.75 44 1.88
  mm 1682.8 1376.42 34.92 66.90 87.15 121.31 63.5 1447.8 1593.9 47.8
60 in. 73.00 60.19 1.500 2.892 3.774 5.236 2.75 63.00 69.25 52 1.88
  mm 1854.2 1528.82 38.1 73.46 95.86 132.99 69.9 1600.2 1759.0 . 47.8
66 in. 80.00 66.19 1.50 3.139 4.132 5.674 2.75 69.00 76.00 52 1.88
  mm 2032.0 1681.22 38.1 79.73 104.95 144.12 69.9 1752.6 1930.4 47.8
72 in. 86.50 72.19 1.500 3.399 4.476 6.137 2.75 75.00 82.50 60 1.88
  mm 2197.1 1833.62 38.1 86.33 113.69 155.88 69.9 1905.0 2095.5 . 47.8
(1) Class B: 86psi
(2) Class D:150 psi
(1) Class B:86 psi