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AWWA Standard Steel-Hub Flange (275 psi*)

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Table 4 Class E

Drilling  
Nom Size OD Thickness Overall Thickness Dia at Base Bore Bolt Circle Hole Dia # of Holes Weight
A L E B C
4 9 0.938 1.312 5.312 4.57 7.5 0.75 8 13
5 10 0.938 1.438 6.438 5.66 8.5 0.875 8 14
6 11 1 1.562 7.562 6.72 9.5 0.875 8 17
8 13.5 1.125 1.75 9.688 8.72 11.75 0.875 8 28
10 16 1.188 1.938 12 10.88 14.25 1 12 37
12 19 1.25 2.188 14.375 12.88 17 1 12 59
14 21 1.375 2.25 15.75 14.19 18.75 1.125 12 78
16 23.5 1.438 2.5 18 16.19 21.25 1.125 16 101
18 25 1.562 2.688 19.875 18.19 22.75 1.25 16 110
20 27.5 1.688 2.875 22 20.19 25 1.25 20 139
22 29.5 1.812 3.125 24 22.19 27.25 1.375 20 162
24 32 1.875 3.25 26.125 24.19 29.5 1.375 20 197
26 34.25 2 3.375 28.5 26.19 31.75 1.375 24 235
28 36.5 2.062 3.438 30.75 28.19 34 1.375 28 269
30 38.75 2.125 3.5 32.75 30.19 36 1.375 28 303
32 41.75 2.25 3.625 35 32.19 38.5 1.625 28 375
34 43.75 2.312 3.688 37 34.19 40.5 1.625 32 401
36 46 2.375 3.75 39.25 36.19 42.75 1.625 32 452
38 48.75 2.375 3.75 41.75 38.19 45.25 1.625 32 528
40 50.75 2.5 3.875 43.75 40.19 47.25 1.625 36 573
42 53 2.625 4 46 42.19 49.5 1.625 36 648
44 55.25 2.625 4 48 44.19 51.75 1.625 40 688
46 57.25 2.688 4.062 50 46.19 53.75 1.625 40 733
48 59.5 2.75 4.125 52.25 48.19 56 1.625 44 799
50 61.75 2.75 4.125 54.25 50.19 58.25 1.875 44 827
52 64 2.875 4.25 56.5 52.19 60.5 1.875 44 922
54 66.25 3 4.375 58.75 54.19 62.75 1.875 44 1024
60 73 3.125 4.5 65.25 60.19 69.25 1.875 52 1253
66 80 3.375 4.875 71.5 66.19 76 1.875 52 1623
72 86.5 3.5 5 78.5 72.19 82.5 1.875 60 1922
78 93 3.875 5.375 84.5 78.19 89 2.125 64 2279
84 99.75 3.875 5.375 90.5 84.19 95.5 2.125 64 2586
90 106.5 4.25 5.75 96.75 90.19 102 2.438 68 3061
96 113.25 4.25 5.75 102.75 96.19 108.5 2.438 68 3432

Dimensions are in inches. Weights are in pounds.

Notes: 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 is 275 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 class 150 standard for steel flanges. The thickness of a class 150 flange from which the raised face has been removed shall be no less than dimension T minus 0.06 in.


Class 4E AWWA Standard Steel-Hub Flange PDF (for printing).