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Measurement and symbols of surface roughness

Type Maximum height of workpiece Symbol Rz
Describe ph_technology_8_02.gifThe maximum height of the profile is the distance between the maximum peak height and the maximum valley bottom depth, which is the average of each sample length RZ (ISO / JIS) is the average value of the maximum peak valley height in the evaluation length.


Type Arithmetic mean deviation of contour Symbol Ra
Describe ph_technology_8_03.gifThe arithmetic mean deviation of the contour is the arithmetic mean of the absolute value of the distance from the mean line to the contour.
Value of maximum height of profile Arithmetic mean deviation of contour Collation symbol Surface texture indication in technical product documentation
0.05S
0.1S
0.2S
0.4S
0.8S
0.012a
0.025a
0.05a
0.1a
0.2a
 symbol_4.jpg  Ra0.012_Ra0.2.jpg
1.6S
3.2S
6.3S
0.4a
0.8a
1.6a
 symbol_3.jpg  Ra0.4_Ra1.6.jpg
12.5S
25S
3.2a
6.3a
 symbol_2.jpg  Ra3.2_Ra6.3.jpg
50S
100S
12.5a
25a
 symbol_1.jpg  Ra12.5_Ra25.jpg


    
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