Grit Size Comparison table
Grit Size Comparison
| USA | European (Grade) | Micron Size | Surface Finish on Stainless Steel | |
| RA µm | RA µ inch | |||
| 60 | 60 | 250 | 2 | 85 |
| 80 | 80 | 180 | 1.65 | 70 |
| 100 | 100 | 150 | ||
| 120 | 120 | 106 | 1.50 | 50 |
| 150 | 150 | 90 | 0.75 | 30 |
| 180 | 180 | 75 | 0.62 | 25 |
| 220 | 220 | 68 | ||
| 240 | P280 | 52 | 0.45 | 18 |
| 280 | P360 | 42 | 0.40 | 15 |
| 320 | P400 | 34 | 0.25 | 10 |
| 400 | P800 | 22 | ||
| 600 | P1200 | 14 | ||
| 800 | P2400 | 8 | ||
| 1000 | P4000 | 5 | ||
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