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Surface finish conversions from English to metric

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Q. I would like to convert surface finish from English to metric numbers, i.e.,
what is a metric equivalent to a 32 µinch surface finish.

Thanks Andy

Andy White
telecommunications - Amesbury , Massachusetts


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A. The conversion factor between micro-inches (µ") and micro-meters (µm) is multiplying by 0.025 which is equivalent to dividing by 40. In the conversion requested, 32 micro-inches are therefore equal to 0.8 micro-meters.

Best regards,

Giovanni M. Ciriani
metallic watch bands - Altavilla, VI, Italy


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A. 1 meter = 39.37 inch.

.000032 inch divided by 39.37 equals .000000812 meter

32 micro-inch equals .8 micro-meter.

Oscar Bonifacio
- Fullerton, California


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March 17, 2009

Q. So what is the correct conversion for a Rz25 finish?

Dan White
machine shop - Appleton Wisconsin


March 19, 2009

A. Hi, Dan. Proceeding exactly per Oscar again --

1 meter = 39.37 inch.

.000025 inch divided by 39.37 equals .000000625 meter;

25 micro-inch Rz equals .6 micro-meter Rz.

Regards,

pic of Ted Mooney Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey

July 23, 2012

Q. What is the US finish call-out for European Ra 63 finish?

Anthony Mastropolo
- Pleasant Prairie, Wisconsin USA


July 24, 2012

Hi Anthony.

The US equivalent of an Ra 63µm finish would, as explained above, be Ra 2520 µin., which sounds far too rough to be a reasonable answer. It sounds to me like maybe you may already have the US callout; but if you can present the details of your situation, I think we can probably help. Good luck.

Regards,

pic of Ted Mooney Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey

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