| Core Bit Diameter | RPM |
| 1/4" | 10,000 |
| 3/8" | 8,000 |
| 1/2" | 6,000 |
| 5/8" | 5,000 |
| 3/4" | 4,500 |
| 1" | 4,000 |
| 1-1/4" | 3,800 |
| 1-3/8" | 3,500 |
| 1-1/2" | 3,400 |
| 1-3/4" | 3,300 |
| 2" | 3,000 |
| 2-1/4" | 2,600 |
| 2-3/8" | 2,300 |
| 2-1/2" | 2,000 |
|
|
| Core Bit Diameter | RPM |
| 2-5/8" | 1,700 |
| 2-3/4" | 1,350 |
| 3" | 1,000 |
| 3-1/4" | 900 |
| 3-3/8" | 800 |
| 3-1/2" | 700 |
| 3-3/4" | 575 |
| 4" | 450 |
| 4-1/4" | 420 |
| 4-3/8" | 400 |
| 4-1/2" | 375 |
| 4-5/8" | 350 |
| 4-3/4" | 325 |
| 5" | 300 |
|