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North America Aggregate Classification Map
Soft
- Soft Limestone
- Sandstone
- Dolomite Limestone
- Siliceous
- Soft Shell
Medium Soft
- Pit Gravel
- Limestone
- Dolomite
Medium
- Medium Hard River Rock
- Gravel
- Medium Traprock
- Decomposed Granite
Medium Hard
- Granite
- Slate
- Traprock
- Basalt
- Quartzite
Hard
- Hard Chert
- Hard Quartz
- Flint Rock
- Hard River Rock
Recommended Operating Speeds
| Blade Diameter | Optimum Operating Speed (RPMs) | Maximum Operating Speed (RPMs) |
|---|---|---|
| 4 | 9,075 | 15,000 |
| 4 ½ | 8,065 | 13,300 |
| 5 | 7,255 | 12,000 |
| 6 | 6,045 | 10,185 |
| 7 | 5,185 | 8,730 |
| 8 | 4,535 | 7,640 |
| 9 | 4,030 | 6,790 |
| 10 | 3,630 | 6,115 |
| 12 | 3,025 | 5,095 |
| 12HS | - | 6,300 |
| 14 | 2,595 | 4,365 |
| 14HS | - | 5,460 |
| 16 | 2,270 | 3,820 |
| 16HS | - | 4,725 |
| 18 | 2,015 | 3,395 |
| 20 | 1,815 | 3,055 |
| 20 ⅝ | 1,760 | 2,965 |
| 24 | 1,510 | 2,550 |
| 26 | 1,395 | 2,350 |
| 30 | 1,120 | 2,040 |
| 36 | 1,010 | 1,700 |
| 42 | 865 | 1,455 |
| 48 | 755 | 1,275 |