Metal Surface Finishes |
| Roughness Average (Ra) Heights |
| Micro Inch (μin) |
Micro Meter (μm) |
Finish Notes |
| 1 |
0.025 |
N1, No. 8, Grit 500, Super Mirror |
| 2 |
0.050 |
N2, No. 8, Super Mirror |
| 4 |
0.10 |
N3, No. 8, Grit 400, Mirror |
| 8 |
0.2 |
N4, No. 8, Mirror |
| 16 |
0.40 |
N5, No. 7, 320 Grit |
| 20-25 |
0.51-0.63 |
No. 4, Biothec Finish |
| 32 |
0.80 |
N6, No. 4, 2B, 3A Sanitary |
| 40-60 |
1.00-1.500 |
No. 2, No. 3, Satin Sheet |
| 63 |
1.6 |
N7, 2D (80 Grit) |
| 125 |
3.2 |
N8 Rough, Grit 120 (UK) |
| 250 |
6.3 |
N9, No.1, Mill Plate |
| 500 |
12.5 |
N10 Rough |
| 1000 |
25 |
N11 Rough |
| 2000 |
50 |
N12 Rough |
