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30 RA to Microns

How do you convert from English Ra to microns. I need to have impression rollers grinded down to somewhere between 32-63 microns but my American supplier uses Ra. The surface finishes that they provided us ranged from 30-40 Ra. Is there a simple way to convert this? Are they within our metric tolerances?

Thank you!

Jeff B
Plant Shop Employee - St. Louis, Missouri
January 5, 2011

Hi, Jeff.

There are 39.37 inches in a meter, so there are just under 40 microinches in a micron. An Ra of 30-40 microinches would thus be an Ra of about .75 to 1.0 micron. I suspect that your in-house terminology is wrong and that you actually require an Ra of 32 to 63 microinches.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
(Ted can offer longterm or instant help)
finishing.com - Pine Beach, New Jersey
January , 2011

Q. Can anyone tell me what 150 microns would be in an Ra finish?

Thank you,
Danny

Danny Ostrander
- Gelnwood, Minnesota, USA
January 11, 2012

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