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Surface Finish in Japanese Standards JIS

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

A KAMINOULU
machine shop - TORONTO, ONTARIO, CANADA
2004

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
2007

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

Mark Otis
steel - Kingman, Arizona, USA
August 7, 2014

A. I hope this document could help.

http://files.engineering.com/download.aspx?folder=1d149e35-945a-4839-9ef3-3162af3752f4&file=Binder2.pdf

Mek Chaiyasonth
Petrochemical Plant Engineering & Construction - Bangkok, Thailand
February 1, 2017

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