Formally Table 1 Class B Table 2 Class B (Blinds from table 7) AWWA standard steel-ring flanges, Class B* (86 psi) Drilling Template OD of Flange ID of Flange Thickness of Flange (T) Number of Bolt Holes Diam. of Bolt Holes Diam. of Bolt Circle Weights Nominal Pipe Size (A) (B) Slip-On Blind (C) Slip-on Blind 4 9.00 4.57 0.625 0.625 8 0.750 7.50 8 11 5 10.00 5.66 0.625 0.625 8 0.875 8.50 9 14 6 11.00 6.72 0.688 0.688 8 0.875 9.50 11 19 8 13.50 8.72 0.688 0.688 8 0.875 11.75 15 28 10 16.00 10.88 0.688 0.688 12 1.000 14.25 19 39 12 19.00 12.88 0.688 0.719 12 1.000 17.00 28 58 14 21.00 14.19 0.688 0.791 12 1.125 18.75 34 78 16 23.50 16.19 0.688 0.892 16 1.125 21.25 41 110 18 25.00 18.19 0.688 0.950 16 1.250 22.75 41 132 20 27.50 20.19 0.688 1.040 20 1.250 25.00 49 175 22 29.50 22.19 0.750 1.132 20 1.375 27.25 57 219 24 32.00 24.19 0.750 1.216 20 1.375 29.50 67 277 26 34.25 26.19 0.812 1.307 24 1.375 31.75 80 341 28 36.50 28.19 0.875 1.398 28 1.375 34.00 94 414 30 38.75 30.19 0.875 1.477 28 1.375 36.00 105 493 32 41.75 32.19 0.935 1.581 28 1.625 38.50 132 613 34 43.75 34.19 0.935 1.661 32 1.625 40.50 137 707 36 46.00 36.19 1.000 1.751 32 1.625 42.75 161 824 38 48.75 38.19 1.000 1.853 32 1.625 45.25 185 980 40 50.75 40.19 1.000 1.933 36 1.625 47.25 193 1108 42 53.00 42.19 1.125 2.023 36 1.625 49.50 234 1264 44 55.25 44.19 1.125 2.114 40 1.625 51.75 249 1436 46 57.25 46.19 1.125 2.194 40 1.625 53.75 260 1600 48 59.50 48.19 1.250 2.285 44 1.625 56.00 306 1800 50 61.75 50.19 1.250 2.377 44 1.875 58.25 317 2017 52 64.00 52.19 1.250 2.468 44 1.875 60.50 339 2249 54 66.25 54.19 1.375 2.559 44 1.875 62.75 397 2499 60 73.00 60.19 1.500 2.820 52 1.875...
