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Surface Finish in Japanese Standards JIS


Q. Where can I find explanation and symbols for surface finish in JIS.



Q. Where can I find symbol and conversion information regarding JIS surface finish requirements? I'm referring to the "upside triangle" symbols used by most Japanese manufacturers. I need to know what the symbols mean, what numerical value is associated with them, and how to convert them to Ra or Rma.

Rick Spellman
- Mason, Ohio, US

August 7, 2014

Q. What is the RMS or Ra smoothness conversion for Japanese 12.5a and 2.2?

Mark Otis
steel - Kingman, Arizona, USA

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