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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


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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