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Surface Finish in Japanese Standards JIS


(2004)

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

A KAMINOULU
machine shop - TORONTO, ONTARIO, CANADA


(2007)

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


February 1, 2017

A. I hope this document could help.

https://www.google.co.th/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&cad=rja&uact=8&ved=0ahUKEwi4hO7qw-7RAhVLto8KHWo5AD0QFgg6MAQ&url=http%3A%2F%2Ffiles.engineering.com%2Fdownload.aspx%3Ffolder%3D1d149e35-945a-4839-9ef3-3162af3752f4%26file%3DBinder2.pdf&usg=AFQjCNG7MQXglqxm9oDAuYyw9BtjoGTnQw&sig2=qPWpneUdkwF04pR1VkJs7g

Mek Chaiyasonth
Petrochemical Plant Engineering & Construction - Bangkok, Thailand

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