Surface Finish Comparison Chart


Arithmatical Average Root Mean Square Highest Peak Rp to Valley Rᵥ In an Assigned Length Average Distance Between 5 Deepest Valleys & Peaks
Ra RMS (Rq) Rt Rz
µ (in) µ (M) µ (in) µ (M) µ (in) µ (M)
48 1.2 52 1.3 10 6.0
24 0.6 26 0.66 5 3.0
20 0.5 22 0.55 4 2.5
16 0.4 17.6 0.44 3 2.0
12 0.3 13.2 0.33 2.5 1.6
10 0.25 10.8 0.27 2 1.2
8 0.2 8.8 0.22 1.6 1.0
6 0.15 7.2 0.18 1.2 0.8
4.8 0.12 5.2 0.13 1 0.6
4 0.1 4.4 0.11 0.9 0.5
3.2 0.8 3.5 0.088 0.8 0.4
2.4 0.06 2.6 0.066 0.6 0.3
2 0.05 2.2 0.055 0.5 0.3
1.6 0.04 1.8 0.044 0.4 0.2
1.2 0.03 1.3 0.033 0.3 0.2
1 0.025 1.1 0.027 0.25 0.01
0.8 0.02 0.9 0.022 0.2 0.10
0.6 0.015 0.7 0.018 0.15 0.08
0.5 0.012 0.5 0.013 0.12 0.06
0.4 0.01 0.4 0.011 0.1 0.05
0.3 0.008 0.3 0.009 0.08 0.04
0.2 0.006 0.2 0.007 0.06 0.03
Rt = Rp + Rv R2 = R + Rᵥ (5 Deepest)

Above is a relative comparison and not a direct comparison