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Converting Rz measurements to Rms measurements

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I'm looking for information for converting surface finish specifications measured in "Rz" to those measured in "Rms". This would be mainly on steel parts. Thanks for the help.

Kay Kucharik
- Solon, Ohio

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Rz is the same as RMS; however, the Rz spec designates a specific number of ridges and valleys (5) to be traversed by a profilometer.

AF Kenton
Huntingdon Valley, Pennsylvania

Profilometer

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