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DIN ISO 1302, DIN 4768 - Comparison of Surface Roughness Values
DIN ISO 1302 and DIN 4768 are the Germany standards for surface
roughness for various areas, including metal castings. The
followings are some explanation to the symbols and comparison to
surface roughness values.
|
Surface Roughness Symbols |
Explanation |
|
 |
Symbol without additional indications.
Basic symbol. The meaning must be explained by additional
indications. |
|
 |
Symbol with additional indications.
Any production method, with specified roughness. |
|
 |
Symbol without additional indications.
Removal of material by machining, without specified
roughness. |
|
 |
Symbol with additional indications.
Removal of material by machining, with specified roughness. |
|
 |
Symbol without additional indications.
Removal of material is not permitted (surface remains in
state as supplied). |
|
 |
Symbol with additional indications.
Made without removal of material (non-cutting), with
specified roughness. |
Comparison of Roughness Values
| DIN ISO 1302 |
Roughness Values Ra (um) |
0.025 |
0.05 |
0.1 |
0.2 |
0.4 |
0.8 |
1.6 |
3.2 |
6.3 |
12.5 |
25 |
50 |
| Roughness Values Ra (uin) |
1 |
2 |
4 |
8 |
16 |
32 |
63 |
125 |
250 |
500 |
1000 |
2000 |
| Roughness Grade Numbers |
N1 |
N2 |
N3 |
N4 |
N5 |
N6 |
N7 |
N8 |
N9 |
N10 |
N11 |
N12 |
| DIN 4768 |
Roughness Values Rz (um) from |
0.1 |
0.25 |
0.4 |
0.8 |
1.6 |
3.15 |
6.3 |
12.5 |
25 |
40 |
80 |
160 |
| to |
0.8 |
1.6 |
2.5 |
4.0 |
6.3 |
12.5 |
20 |
31.5 |
63 |
100 |
160 |
250 |
For more information, please refer to
Surface Finish Degree
(Smoothness) Comparison Table between Rz, Ra and RMS.
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