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2-Surface Finish - How to Read the Surface Finish Symbols

Surface finishes are usually specified with a "check mark" on the blueprint as shown in the in graphic below. Surface finishes are specified in microinches and are located on the left side of the symbol above the check mark "V". In the example below the value is shown as 32.

The waviness requirement (if specified) is usually given in thousands of an inch and is located on the top right of the symbol. In the example it is the value ".0015"

The roughness width requirement (if specified) is usually given in thousands of an inch and is located on the bottom right of the symbol. In the example it is the value ".002".

The lay direction requirement (if specified) is usually represented by a symbol and is located right below the roughness width requirement. In the example it is the symbol for perpendicularity. The graphic below show the rest of the symbols.

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