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Surface Finish Degree Comparison Table between Rz Ra RMS








The following comparison table was edited by SST. You can find the comparison for the new standard in China for the Ra and Rz, and the micron, microinch Ra in USA.  In addtion, we also lised the old grades in China for your reference. The old grades are still widely used in China. We usually called the Downward-pointing Triangle as "hwar". The comparison table just for your reference, should not be taken as the inspection standard.

China Old Grade China New
Ra
China New
Rz
USA micron
Ra
USA microinch
Ra
▽ 1 50 200    
▽ 2 25 100    
▽ 3 12.5 50    
▽ 4 6.3 25 8.00 320
6.30 250
▽ 5 3.2 12.5 5.00 200
4.00 160
3.20 125
▽ 6 1.6 6.3 2.50 100
2.00 80
1.60 63
▽ 7 0.8 6.3 1.25 50
1.00 40
0.80 32
▽ 8 0.4 3.2 0.63 25
0.50 20
0.40 16
▽ 9 0.2 1.6 0.20 12.5
10
8
▽ 10 0.1 0.8 0.10  

RMS (microinch) RMS
(µm)
RA (microinch) RA 
(µm)
Grit Size
80 58
47
34
17
14
2.03 1.47
1.2
0.6
0.43
0.36
71 52
42
30
15
12
1.90 1.32
1.06
0.76
0.38
0.30
80 120
150
180
240
320




Machining surface finish chart: Ra vs RMS

USA Ra(µm) USA Ra (Micro inch) USA RMS (Micro inch) Machining Finish Method
50.0 2000 2200 The most coarse machining or good rough casting surfaces
25.0 1000 1100 Machining marks very obvious. Rough turning, boring, planning, drilling
12.5 500 550 Machining marks obvious. Normal turning, boring, planning, drilling, grinding
8.00 320 352 Machining marks visible. Normal turning, boring, planning, drilling , grinding
6.30 250 275 Machining marks visible. Normal turning, boring, planning, drilling , grinding
5.00 200 220 Machining marks not obvious. But still visible. Normal turning, boring, planning, drilling, grinding.
4.00 160 176 Machining marks not obvious. But still visible. Normal turning, boring, planning, drilling, grinding.
3.20 125 137.5 Machining marks not obvious. But still visible. Normal turning, boring, planning, drilling, grinding.
2.50 100 110 Machining marks blur, but direction obvious. Number controlled turning, boring, planning, drilling, grinding.
2.00 80 88 Machining marks blur, but direction obvious. Number controlled turning, boring, planning, drilling, grinding.
1.60 63 69.3 Machining marks blur, but direction obvious. Number controlled turning, boring, planning, drilling, grinding.
1.25 50 55 Machining marks direction blur, but still visible. Number controlled turning, boring, planing, drilling, grinding.
1.00 40 44 Machining marks direction blur, but still visible. Number controlled turning, boring, planing, drilling, grinding.
0.80 32 35.2 Machining marks direction blur, but still visible. Number controlled turning, boring, planing, drilling, grinding.
0.63 25 27.5 Machining marks direction blur. Reaming, grinding, boring, rolling.
0.50 20 22 Machining marks direction blur. Reaming, grinding, boring, rolling.
0.40 16 17.6 Machining marks direction blur. Reaming, grinding, boring, rolling.
0.20 12.5 13.75 Machining marks direction invisible. Grinding, super machining
0.20 10 11 Machining marks direction invisible. Grinding, super machining
0.20 8 8.8 Machining marks direction invisible. Grinding, super machining
0.10 4 4.4 Surface dark gloss. Surper machining

Ra is the arithmetic average of surface heights measured across a surface. Simply average the height across the microscopic peaks and valleys.

Ra and RMS are both representations of surface roughness, but each is calculated differently.

Ra is calculated as the Roughness Average of a surfaces measured microscopic peaks and valleys.

RMS is calculated as the Root Mean Square of a surfaces measured microscopic peaks and valleys. Each value uses the same individual height measurements of the surfaces peaks and valleys, but uses the measurements in a different formula.

Related References:
1. ISO 1302 DIN 4768 Comparison of Surface Roughness Values
2. Electrical Discharge Machining EDM Roughness Comparator
3. Polishing Polished Seamless Stainless Steel Pipe Tube
4. Stainless Steel Tubes Surface Roughness Review
5. Stainless Steel Bright Annealing/Annealed Tubes
6. China USA Surface Roughness Standard Comparison
7. Surface Roughness Conversion Chart of Stainless Steel Tube
8. Stainless Steel Tube Surface Finish Types
9. Cleaning of Stainless Steel Tubes
10. Post weld cleaning and finishing of stainless steels
11. Care and maintenance of stainless steel
12. British and American standards for tolerances, surface finish and testing of stainless steel
13. Surface Finish Degree Comparison Table between Rz Ra RMS

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