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AWWA Standard Steel-Ring Flange (300 psi*)

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Table 6 Class F (Blinds from Table 7)

Thickness Drilling Weight
Nom Size OD Slip-On Blind Bore Bolt Circle Hole Dia # of Holes Slip-on Blind
A T B C
4 10 1.13 1.13 4.57 7.88 0.875 8 18 25
5 11 1.21 1.21 5.66 9.25 0.875 8 22 33
6 12.5 1.31 1.31 6.73 10.62 0.875 12 30 46
8 15 1.31 1.31 8.73 13 1 12 40 66
10 17.5 1.5 1.5 10.88 15.25 1.125 16 56 102
12 20.5 1.63 1.63 12.88 17.75 1.25 16 83 152
14 23 1.94 1.94 14.19 20.25 1.25 20 128 228
16 25.5 2.14 2.14 16.19 22.5 1.375 20 167 310
18 28 2.25 2.25 18.19 24.75 1.375 24 204 392
20 30.5 2.33 2.33 20.19 27 1.375 24 247 482
22 33 2.5 2.5 22.19 29.25 1.375 24 307 606
24 36 2.69 2.69 24.19 32 1.625 24 388 776
26 38.25 3 3 26.19 34.5 1.875 28 451 977
28 40.75 3.13 3.13 28.19 37 1.875 28 532 1156
30 43 3.15 3.166 30.19 39.25 1.875 28 586 1303
32 45.25 3.25 3.332 32.19 41.5 1.875 28 657 1518
34 47.5 3.38 3.475 34.19 43.5 1.875 28 741 1745
36 50 3.46 3.671 36.19 46 2.125 32 802 2042
38 52.25 3.5 3.815 38.19 48 2.125 32 874 2317
40 54.25 3.63 3.982 40.19 50.25 2.125 36 937 2608
42 57 3.81 4.171 42.19 52.75 2.125 36 1103 3015
44 59.25 4 4.338 44.19 55 2.125 36 1237 3388
46 61.5 4.13 4.505 46.19 57.25 2.125 40 1344 3791
48 65 4.5 4.781 48.19 60.75 2.125 40 1718 4494

Dimensions are in inches. Weights are in pounds.

Notes: *Pressure rating at atmospheric temperature is 300 psi. These flanges have the same OD and drilling as ANSI/ASME B16.1 class 250 cast-iron pipe and flanged fittings.


Class 6F AWWA Standard Steel-Ring Flange PDF (for printing).