Roymech engineering encyclopedia

Surface Finish Symbols and Texture Indications in Engineering Drawings




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This page provides engineering information on surface finish symbols and texture indications used in technical drawings, including ISO standards for specifying surface roughness and machining requirements.

The information supports engineers and designers in interpreting drawing symbols, defining manufacturing processes and ensuring correct surface quality in mechanical components.

Surface Finish Symbols and Indications

BS EN ISO 1302:2002 Geometrical product specifications (GPS). Indication of surface texture in technical product documentation

For notes on surface roughness use link Surface Roughness Notes



Machining Requirements and Surface Symbols



Directrion of Lay





Machining Allowance



The Symbol indicates the surface finish requirements and shows a machining allowance requirement of 3mm on all surfaces.  


Symbol for surface texture all component surfaces



The Symbol indicates that all of the component surfaces are to be machined...


Location of Surface Texture Symbols



The shows typical locations for surface texture symbols...




See Also


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