• Table 7 AWWA Blind Flanges
  • All dimensions are in inches.
  • Blind flanges shall be machined with center island to match the mating flange.
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Item #

Nominal Pipe Size

Working Pressure

Outside Diameter (A)

Minimum Thickness (T)

Approximate Weight (lbs)

Number of Bolt Holes

Diameter of Bolt Holes

Diameter of Bolt Circle (C)

N/A 4 N/A 300 psi N/A 10.00 N/A 1.130 N/A 28 N/A 8 N/A 0.875 N/A 7.88
N/A 5 N/A 300 psi N/A 11.00 N/A 1.210 N/A 36 N/A 8 N/A 0.875 N/A 9.25
N/A 6 N/A 300 psi N/A 12.50 N/A 1.310 N/A 50 N/A 12 N/A 0.875 N/A 10.62
N/A 8 N/A 300 psi N/A 15.00 N/A 1.310 N/A 72 N/A 12 N/A 1.000 N/A 13.00
N/A 10 N/A 300 psi N/A 17.50 N/A 1.500 N/A 111 N/A 16 N/A 1.125 N/A 15.25
N/A 12 N/A 300 psi N/A 20.50 N/A 1.630 N/A 164 N/A 16 N/A 1.250 N/A 17.75
N/A 14 N/A 300 psi N/A 23.00 N/A 1.940 N/A 243 N/A 20 N/A 1.250 N/A 20.25
N/A 16 N/A 300 psi N/A 25.50 N/A 2.140 N/A 328 N/A 20 N/A 1.375 N/A 22.50
N/A 18 N/A 300 psi N/A 28.00 N/A 2.250 N/A 414 N/A 24 N/A 1.375 N/A 24.75
N/A 20 N/A 300 psi N/A 30.50 N/A 2.330 N/A 521 N/A 24 N/A 1.375 N/A 27.00
N/A 22 N/A 300 psi N/A 33.00 N/A 2.500 N/A 651 N/A 24 N/A 1.375 N/A 29.25
N/A 24 N/A 300 psi N/A 36.00 N/A 2.690 N/A 830 N/A 24 N/A 1.625 N/A 32.00
N/A 26 N/A 300 psi N/A 38.25 N/A 3.000 N/A 1038 N/A 28 N/A 1.875 N/A 34.50
N/A 28 N/A 300 psi N/A 40.75 N/A 3.130 N/A 1226 N/A 28 N/A 1.875 N/A 37.00
N/A 30 N/A 300 psi N/A 43.00 N/A 3.166 N/A 1380 N/A 28 N/A 1.875 N/A 39.25
N/A 32 N/A 300 psi N/A 45.25 N/A 3.332 N/A 1603 N/A 28 N/A 1.875 N/A 41.50
N/A 34 N/A 300 psi N/A 47.50 N/A 3.475 N/A 1839 N/A 28 N/A 1.875 N/A 43.50
N/A 36 N/A 300 psi N/A 50.00 N/A 3.671 N/A 2146 N/A 32 N/A 2.125 N/A 46.00
N/A 38 N/A 300 psi N/A 52.25 N/A 3.815 N/A 2431 N/A 32 N/A 2.125 N/A 48.00
N/A 40 N/A 300 psi N/A 54.25 N/A 3.982 N/A 2730 N/A 36 N/A 2.125 N/A 50.25
N/A 42 N/A 300 psi N/A 57.00 N/A 4.171 N/A 3151 N/A 36 N/A 2.125 N/A 52.75
N/A 44 N/A 300 psi N/A 59.25 N/A 4.338 N/A 3535 N/A 36 N/A 2.125 N/A 55.00
N/A 46 N/A 300 psi N/A 61.50 N/A 4.505 N/A 3949 N/A 40 N/A 2.125 N/A 57.25
N/A 48 N/A 300 psi N/A 65.00 N/A 4.781 N/A 4671 N/A 40 N/A 2.125 N/A 60.75
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