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Surface Roughness Ra / N Grade Converter

Enter the measurement or designation you have. Calcori maps it to the nearest supported standard reference while keeping material and standard families separate.

Materials & technical conversions ↗
Language · English (Ireland)
ISO N gradeN7
Ra1.6 µm · 63 µin
RMS approx.70 µin

RMS/Rq is an approximation; the ISO N-grade match here is based on Ra. Reference identification only. Verify the current standard or manufacturer data before purchasing or using the result in a critical application.