表面粗糙度对照表（Surface roughness comparison table）United States surface roughness control chart
China's old standard (finish)
New Chinese standard (roughness) Ra
American Standard (micron) Ra
American Standard (micro inches), Ra
At 4
Six point three
Eight
Three hundred and twenty
Six point three zero
Two hundred and fifty
At 5
Three point two
Five
Two hundred
Four
One hundred and sixty Three point two zero
One hundred and twenty-five At 6
One point six
Two point five zero
One hundred
Two
Eighty
One point six zero
Sixty-three
At 7
Zero point eight
One point two five
Fifty
One
Forty
Zero point eight zero
Thirty-two
At 8
Zero point four
Zero point six three
Twenty-five
Zero point five zero
Twenty
Zero Point Four Zero
Sixteen
Domestic surface roughness and surface roughness Ra and Rz conversion tables (unit: m)
Surface finish
At 1
At 2
At 3
At 4
At 5
At 6
At 7
surface Roughness
Ra
Fifty
Twenty-five Twelve point five Six point three Three point two One point six zero
tabletimeZero point eight zero Rz
Two hundred
One hundred
Fifty
Twenty-five
Twelve point five
Six point three
Six point three Surface finish
At 8
At 9
At 10
At 11
At 12
At 13

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