AWWA C207-18 Class D & E Steel Hub Flanges Add Flanges
Note: AWWA dropped hub flanges from the C207 standard in 2013. These dimensions are being provided for industry reference.
| Nominal Size |
Outside Diameter (OD) |
Slip-on Bore (ID) |
No. of Bolt Holes | Diameter of Holes |
Bolt Circle (BC) |
Flange Dimensions Class D (T) |
Flange Dimensions Class D (L) |
Flange Dimensions Class D (E) |
Flange Dimensions Class E (T) |
Flange Dimensions Class E (L) |
Flange Dimensions Class E (E) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 4 | 9.00 | 4.57 | 8 | 0.750 | 7.50 | 0.500 | 0.875 | 5.312 | 0.938 | 1.312 | 5.312 |
| 5 | 10.00 | 5.66 | 8 | 0.875 | 8.50 | 0.562 | 1.250 | 6.312 | 0.938 | 1.438 | 6.438 |
| 6 | 11.00 | 6.72 | 8 | 0.875 | 9.50 | 0.562 | 1.250 | 7.562 | 1.000 | 1.562 | 7.562 |
| 8 | 13.50 | 8.72 | 8 | 0.875 | 11.75 | 0.562 | 1.250 | 9.688 | 1.125 | 1.750 | 9.688 |
| 10 | 16.00 | 10.88 | 12 | 1.000 | 14.25 | 0.688 | 1.250 | 12.000 | 1.188 | 1.938 | 12.000 |
| 12 | 19.00 | 12.88 | 12 | 1.000 | 17.00 | 0.688 | 1.250 | 14.375 | 1.250 | 2.188 | 14.375 |
| 14 | 21.00 | 14.19 | 12 | 1.125 | 18.75 | 0.750 | 1.250 | 15.750 | 1.375 | 2.250 | 15.750 |
| 16 | 23.50 | 16.19 | 16 | 1.125 | 21.25 | 0.750 | 1.250 | 18.000 | 1.438 | 2.500 | 18.000 |
| 18 | 25.00 | 18.19 | 16 | 1.250 | 22.75 | 0.750 | 1.250 | 19.875 | 1.562 | 2.688 | 19.875 |
| 20 | 27.50 | 20.19 | 20 | 1.250 | 25.00 | 0.750 | 1.250 | 22.000 | 1.688 | 2.875 | 22.000 |
| 22 | 29.50 | 22.19 | 20 | 1.375 | 27.25 | 1.000 | 1.750 | 24.250 | 1.812 | 3.125 | 24.000 |
| 24 | 32.00 | 24.19 | 20 | 1.375 | 29.50 | 1.000 | 1.750 | 26.125 | 1.875 | 3.250 | 26.125 |
| 26 | 34.25 | 26.25 | 24 | 1.375 | 31.75 | 1.000 | 1.750 | 28.500 | 2.000 | 3.375 | 28.500 |
| 28 | 36.50 | 28.25 | 28 | 1.375 | 34.00 | 1.000 | 1.750 | 30.500 | 2.062 | 3.438 | 30.750 |
| 30 | 38.75 | 30.25 | 28 | 1.375 | 36.00 | 1.000 | 1.750 | 32.500 | 2.125 | 3.500 | 32.750 |
| 32 | 41.75 | 32.25 | 28 | 1.625 | 38.50 | 1.125 | 1.750 | 34.750 | 2.250 | 3.625 | 35.000 |
| 34 | 43.75 | 34.25 | 32 | 1.625 | 40.50 | 1.125 | 1.750 | 36.750 | 2.312 | 3.688 | 37.000 |
| 36 | 46.00 | 36.25 | 32 | 1.625 | 42.75 | 1.125 | 1.750 | 38.750 | 2.375 | 3.750 | 39.250 |
| 38 | 48.75 | 38.25 | 32 | 1.625 | 45.25 | 1.125 | 1.750 | 40.750 | 2.375 | 3.750 | 41.750 |
| 40 | 50.75 | 40.25 | 36 | 1.625 | 47.25 | 1.125 | 1.750 | 43.000 | 2.500 | 3.875 | 43.750 |
| 42 | 53.00 | 42.25 | 36 | 1.625 | 49.50 | 1.250 | 1.750 | 45.000 | 2.625 | 4.000 | 46.000 |
| 44 | 55.25 | 44.25 | 40 | 1.625 | 51.75 | 1.250 | 2.250 | 47.000 | 2.625 | 4.000 | 48.000 |
| 46 | 57.25 | 46.25 | 40 | 1.625 | 53.75 | 1.250 | 2.250 | 49.000 | 2.688 | 4.062 | 50.000 |
| 48 | 59.50 | 48.25 | 44 | 1.625 | 56.00 | 1.375 | 2.500 | 51.000 | 2.750 | 4.125 | 52.250 |
| 50 | 61.75 | 50.25 | 44 | 1.875 | 58.25 | 1.375 | 2.500 | 53.000 | 2.750 | 4.125 | 54.250 |
| 52 | 64.00 | 52.25 | 44 | 1.875 | 60.50 | 1.375 | 2.500 | 55.000 | 2.875 | 4.250 | 56.500 |
| 54 | 66.25 | 54.25 | 44 | 1.875 | 62.75 | 1.375 | 2.500 | 57.000 | 3.000 | 4.375 | 58.750 |
| 60 | 73.00 | 60.25 | 52 | 1.875 | 69.25 | 1.500 | 2.750 | 63.000 | 3.125 | 4.500 | 65.250 |
| 66 | 80.00 | 66.25 | 52 | 1.875 | 76.00 | 1.500 | 2.750 | 69.000 | 3.375 | 4.875 | 71.500 |
| 72 | 86.50 | 72.25 | 60 | 1.875 | 82.50 | 1.500 | 2.750 | 75.000 | 3.500 | 5.000 | 78.500 |
| 78 | 93.00 | 78.25 | 64 | 2.125 | 89.00 | 1.750 | 3.000 | 81.250 | 3.875 | 5.375 | 84.500 |
| 84 | 99.75 | 84.25 | 64 | 2.125 | 95.50 | 1.750 | 3.000 | 87.500 | 3.875 | 5.375 | 90.500 |
| 90 | 106.50 | 90.25 | 68 | 2.375 | 102.00 | 2.000 | 3.250 | 93.750 | 4.250 | 5.750 | 96.750 |
| 96 | 113.25 | 96.25 | 68 | 2.44 | 108.50 | 2.000 | 3.250 | 100.000 | 4.250 | 5.750 | 102.750 |
Notes
Dimensions in inches
Overboring of Flanges: Hub flanges are intended to be used on pipes having an OD equal to the nominal pipe size as shown in the first column of this table. Ring flanges (Class B, D, E, and F) may be overbored or counterbored to accommodate pipes having larger OD's.