Question
Download Solution PDFWhat is the value for roughness grade no ‘ N4 ‘ in micrometres
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
- The ISO has recommended a series of preferred roughness values and corresponding roughness grade numbers to be used when specifying surface roughness on a drawing.
- These values and grade numbers are:
|
Roughness Values, Ra (μm) |
Roughness grade number |
Roughness Symbol |
|
50 |
N 12 |
∼ |
|
25 |
N 11 |
∇ |
|
12.5 |
N 10 |
|
|
6.3 |
N 9 |
∇∇ |
|
3.2 |
N 8 |
|
|
1.6 |
N 7 |
|
|
0.8 |
N 6 |
∇∇∇ |
|
0.4 |
N 5 |
|
|
0.2 |
N 4 |
|
|
0.1 |
N 3 |
∇∇∇∇ |
|
0.05 |
N 2 |
|
|
0.025 |
N 1 |
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