Surface finish conversions from English to metric
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 AndyAndy White
telecommunications - Amesbury , Massachusetts
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
A. 1 meter = 39.37 inch.
.000032 inch divided by 39.37 equals .000000812 meter
32 micro-inch equals .8 micro-meter.
- Fullerton, California
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.
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
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.