What are recommended maximum speeds (rpm and m/s) for Grinding Discs?
| Size of Disc | Maximum RPMs |
| 3”, 75mm | 21,800rpm |
| 4”, 100mm | 15,200rpm |
| 4.5”, 115mm | 13,600rpm |
| 5”, 125mm | 12,250rpm |
| 7”, 180mm | 8,500rpm |
| 9”, 230mm | 6,500rpm |
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