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Rz to Ra; Surface texture conversion

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Could someone please help me out with a conversion factor. I need to convert Ra to Rz. If my print states a machined surface to be controlled to a maximum of Rz125, what would be the Ra equal? My measuring equipment has parameter settings of Rz.J, Rz.I and R3z. Which setting would I want if the characteristic tolerance is Rz125? Help! Please.

Todd D [last name deleted for privacy by Editor]
- Toledo, Ohio


April 8, 2008


Rz (din) = Ra*7.2
Rz(ISO) = Ra*7.6

Ra=Rz(din)/7.2
Ra=Rz(ISO)/7.6

san [last name deleted for privacy by Editor]
- shanghai china


January 18, 2009

I want to equivalent of Rz5 in Ra value

Subramani MOHAN KUMAR
MACHINING - HOSUR, TAMIL NANU, INDIA

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