Class 3d AWWA Standard Steel Hub Flange
AWWA Standard Steel-Hub Flange (175-150 psi*)
Table 3 Class D 
Nom Size         Drilling  
OD Thickness Overall Thickness Dia at Base Bore Bolt      Circle Hole           Dia # of        Holes Weight
A T  L E B C      
4 9.00 0.500 0.875 5.312 4.57 7.50 0.750 8 7
5 10.00 0.562 1.250 6.312 5.66 8.50 0.875 8 9
6 11.00 0.562 1.250 7.562 6.72 9.50 0.875 8 11
8 13.50 0.562 1.250 9.688 8.72 11.75 0.875 8 15
10 16.00 0.688 1.250 12.000 10.88 14.25 1.000 12 22
12 19.00 0.688 1.250 14.375 12.88 17.00 1.000 12 33
14 21.00 0.750 1.250 15.750 14.19 18.75 1.125 12 43
16 23.50 0.750 1.250 18.000 16.19 21.25 1.125 16 52
18 25.00 0.750 1.250 19.875 18.19 22.75 1.250 16 52
20 27.50 0.750 1.250 22.000 20.19 25.00 1.250 20 61
22 29.50 1.000 1.750 24.250 22.19 27.25 1.375 20 92
24 32.00 1.000 1.750 26.125 24.19 29.50 1.375 20 105
26 34.25 1.000 1.750 28.500 26.19 31.75 1.375 24 119
28 36.50 1.000 1.750 30.500 28.19 34.00 1.375 28 130
30 38.75 1.000 1.750 32.500 30.19 36.00 1.375 28 144
32 41.75 1.125 1.750 34.750 32.19 38.50 1.625 28 182
34 43.75 1.125 1.750 36.750 34.19 40.50 1.625 32 191
36 46.00 1.125 1.750 38.750 36.19 42.75 1.625 32 207
38 48.75 1.125 1.750 40.750 38.19 45.25 1.625 32 237
40 50.75 1.125 1.750 43.000 40.19 47.25 1.625 36 249
42 53.00 1.250 1.750 45.000 42.19 49.50 1.625 36 287
44 55.25 1.250 2.250 47.000 44.19 51.75 1.625 40 334
46 57.25 1.250 2.250 49.000 46.19 53.75 1.625 40 348
48 59.50 1.375 2.500 51.000 48.19 56.00 1.625 44 407
50 61.75 1.375 2.500 53.000 50.19 58.25 1.875 44 421
52 64.00 1.375 2.500 55.000 52.19 60.50 1.875 44 448
54 66.25 1.375 2.500 57.000 54.19 62.75 1.875 44 475
60 73.00 1.500 2.750 63.000 60.19 69.25 1.875 52 605
66 80.00 1.500 2.750 69.000 66.19 76.00 1.875 52 718
72 86.50 1.500 2.750 75.000 72.19 82.50 1.875 60 803
78 93.00 1.750 3.000 81.250 78.19 89.00 2.125 64 1010
84 99.75 1.750 3.000 87.500 84.19 95.50 2.125 64 1160
90 106.50 2.000 3.250 93.750 90.19 102.00 2.438 68 1430
96 113.25 2.000 3.250 100.000 96.19 108.50 2.438 68 1618
Dimensions are in inches.  Weights are in pounds.
Note:  Hub flanges are to be used on pipe that has an OD equal to the nominal pipe size in the first column.                   *Pressure rating at atmospheric temperature: sizes 4-12 in. inclusive, 175 psi; sizes larger than 12 in., 150 psi.  These flanges have the same OD  and drilling as ANSI/ASME B16.1 class 125 cast-iron flanges.  In sizes 24in. and smaller, they also match ANSI/ASME B16.5 150-psi standard for steel flanges.  

Class 3D AWWA Standard Steel-Hub Flange PDF (for printing).