Stock Blow Ring Sizes
When a mold is not available, we use air to blow the dome through a blow ring. This is called free-blowing.
Using blow rings allows us to manufacture domes in depths ranging from 1″ up to nearly 1/2 of the domes diameter.
(Example: A 20″ Dia. dome can be free-blown up to approx. 9.75″ deep)
Select a size based on the outside diameter of the dome.
All sizes below are listed in inches.
| 4 | 14.250 | 20.500 | 30.120 | 49.430 |
| 4.50 | 14.500 | 20.750 | 30.500 | 49.750 |
| 4.62 | 14.620 | 20.870 | 30.750 | 52.060 |
| 4.93 | 14.680 | 21.000 | 31.000 | 52.120 |
| 5.000 | 14.750 | 21.250 | 31.370 | 52.620 |
| 5.620 | 14.870 | 21.500 | 31.500 | 53.000 |
| 5.930 | 14.930 | 21.750 | 32.000 | 53.500 |
| 6.000 | 15.000 | 22.000 | 32.250 | 54.000 |
| 6.250 | 15.120 | 22.187 | 33.120 | 54.250 |
| 7.000 | 15.180 | 22.250 | 33.750 | 55.250 |
| 7.120 | 15.280 | 22.500 | 33.870 | 55.813 |
| 7.930 | 15.500 | 22.930 | 34.000 | 56.000 |
| 8.000 | 15.750 | 23.000 | 34.500 | 56.280 |
| 8.250 | 15.870 | 23.180 | 35.000 | 56.750 |
| 8.813 | 15.930 | 23.250 | 35.500 | 57.500 |
| 8.500 | 16.000 | 23.370 | 35.688 | 58.000 |
| 9.000 | 16.180 | 23.500 | 36.000 | 58.250 |
| 9.120 | 16.250 | 23.560 | 36.250 | 58.500 |
| 9.250 | 16.370 | 23.750 | 36.280 | 59.000 |
| 9.930 | 16.430 | 23.930 | 36.560 | 59.250 |
| 10.000 | 16.500 | 24.000 | 37.000 | 59.750 |
| 10.120 | 16.750 | 24.120 | 37.370 | 60.000 |
| 10.500 | 16.930 | 24.250 | 37.500 | 60.500 |
| 10.620 | 17.000 | 24.430 | 37.750 | 60.750 |
| 10.750 | 17.180 | 24.500 | 37.870 | 61.500 |
| 10.870 | 17.250 | 24.750 | 38.000 | 63.000 |
| 10.930 | 17.430 | 24.870 | 38.430 | 64.000 |
| 11.000 | 17.500 | 25.000 | 38.500 | 65.870 |
| 11.370 | 17.560 | 25.250 | 39.250 | 66.000 |
| 11.430 | 18.000 | 25.500 | 40.370 | 67.625 |
| 11.500 | 18.120 | 25.750 | 40.500 | 70.000 |
| 11.620 | 18.180 | 26.000 | 41.500 | 72.000 |
| 11.750 | 18.370 | 26.250 | 42.000 | 72.250 |
| 11.870 | 18.500 | 26.370 | 42.120 | 78.250 |
| 12.000 | 18.680 | 26.500 | 42.250 | 80.500 |
| 12.060 | 18.750 | 27.000 | 42.500 | 81.250 |
| 12.120 | 18.810 | 27.250 | 43.125 | 82.250 |
| 12.250 | 19.000 | 27.430 | 44.000 | 83.370 |
| 12.500 | 19.120 | 27.620 | 44.500 | 84.250 |
| 12.870 | 19.180 | 27.750 | 45.370 | 85.440 |
| 12.930 | 19.250 | 28.000 | 45.625 | 86.000 |
| 13.000 | 19.500 | 28.180 | 45.750 | 90.375 |
| 13.500 | 19.620 | 28.500 | 46.000 | 91.000 |
| 13.560 | 19.750 | 28.750 | 46.500 | 92.000 |
| 13.620 | 19.813 | 29.000 | 46.750 | 96.250 |
| 13.750 | 19.870 | 29.250 | 47.000 | 97.000 |
| 13.870 | 20.000 | 29.370 | 47.500 | |
| 14.000 | 20.120 | 29.500 | 48.120 | |
| 14.120 | 20.370 | 30.000 | 48.370 |