DIN ISO 1302, DIN 4768 – Comparison of Surface Roughness Values

DIN ISO 1302, DIN 4768 – Comparison of Surface Roughness Values

DIN ISO 1302 and DIN 4768 are German standards for surface roughness in various fields (including metal castings). The following table is the explanation of the symbols and comparison with the 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 1302Roughness Values Ra (um)0.0250.050.10.20.40.81.63.26.312.52550
Roughness Values Ra (uin)124816326312525050010002000
Roughness Grade NumbersN1N2N3N4N5N6N7N8N9N10N11N12
DIN 4768Roughness Values Rz (um) from0.10.250.40.81.63.156.312.5254080160
to0.81.62.54.06.312.52031.563100160250

For more information, please refer to Surface Finish Degree (Smoothness) Comparison Table between Rz, Ra and RMS.

 

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