Machining glossary
What is Surface Finish (Ra)?
Ra is the arithmetic average roughness of a surface in micrometres (µm). Typical turned finishes range from Ra 3.2 to Ra 0.8 µm.
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Definition
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Why it matters when buying machined parts
Sealing faces, bearing seats and sliding surfaces need finer Ra values than non-functional faces.
At Precision Machining India we apply this daily in our ISO 9001:2015 certified plant in Pune, India. Send us your drawing for a quote within 24 hours.
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Frequently asked questions
Get a quote in 24hWhat is Surface Finish (Ra)?
Ra is the arithmetic average roughness of a surface in micrometres (µm). Typical turned finishes range from Ra 3.2 to Ra 0.8 µm.
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Everything below is machined in the same Pune plant to the same ISO 9001:2015 system. Follow whichever is closest to the part you are sourcing.
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Upload STEP, IGES or PDF files. NDA available on request. Quoting: Surface Finish (Ra).