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This galvanised mild steel backing ring has the effect of transferring the load from the flange attachment bolts to the total face of the flange. Flange backing rings conform to the drilling pattern of AS 2129 – Table E (Flanges for Pipes, Valves and Fittings) unless otherwise specified.
| Vinidex Code | Size DN (mm) | ID | OD | T | PCD | Hole Diameter | No. of Holes |
| 83500 | 50 | 80 | 150 | 8 | 114 | 18 | 4 |
| 83510 | 65 | 100 | 166 | 10 | 126 | 18 | 4 |
| 83520 | 80 | 109 | 185 | 10 | 146 | 18 | 4 |
| 83530 | 100 | 140 | 215 | 10 | 178 | 18 | 8 |
| 83540 | 125 | 170 | 255 | 12 | 210 | 18 | 8 |
| 83550 | 150 | 203 | 280 | 12 | 235 | 22 | 8 |
| 83560 | 200 | 252 | 335 | 12 | 292 | 22 | 8 |
| 83590 | 300 | 360 | 455 | 12 | 406 | 26 | 12 |
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