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Surface Roughness Conversion Chart Tables Manufacturing Knowledge Menu Surface Roughness Review Surface Roughness Standards Comparator The following charts and tables convert surface finish or roughness between selected industry standard units. Where: Ra = Roughness, average in micro-meters & micro-inches RMS = Root Mean Square in micro-inches CLA = Center Line average in micro-inches Rt = Roughness, total in microns N = New ISO (Grade) Scale numbers Cut-Off Length = Length required for sample. Conversion math at bottom -μ=0.000001m=0.001mm μin=0.000001 in=0.0254 μ Surface Roughness Conversion Chart Cut-Off Ra
Ra
micro-meters
micro-inches
RMS
CLA (N)
Rt
Length
N in.
mm
0.025
1
1.1
1
0.3
1
0.003
0.08
0.05
2
2.2
2
0.5
2
0.01
0.25
0.1
4
4.4
4
0.8
3
0.01
0.25
0.2
8
8.8
8
1.2
4
0.01
0.25
0.4
16
17.6
16
2.0
5
0.01
0.25
0.8
32
35.6
32
4.0
6
0.03
0.8
1.6
63
69.3
63
8.0
7
0.03
0.8
3.2
125
137.5
125
13
8
0.1
2.5
6.3
250
275
250
25
9
0.1
2.5
12.5
500
550
500
50
10
0.1
2.5
25.0
1000
1100
1000
100
11
0.3
8.0
50.0
2000
2200
2000
200
12
0.3
8.0
Conversions (math): CLA (micro inches) = Multiply Ra(µm) x 40 Rt = R a x 8.7
Rz = R a x 7.2 Rz ISO = R a x 7.6 Rmax = R a x 8.0 Rp = R a x 3.6 RPM = R a x 2.9 RMS = R a x 1.1 Example: Ra to Rt: 1.0 micrometer Ra x 8.7 (Rt Factor) = 8.7 micrometer Rt 40 microinch Ra x 8.7 (Rt Factor) = 348 microinch Rt CHINA GB 1031-83 ≈ISO 468-83
USA ASAB 46.1-62
Ra
Rz Ry
(μ)
(μ)
0.008
0.032
0.01
0.04
0.012
0.05
0.016
0.063
0.02
0.08
0.025
0.10
0.032
0.125
0.04
0.16
0.05
0.20
0.063
0.25
0.08
0.32
0.10
0.40
4(0.10)
0.125
0.50
5(0.125)
0.16
0.63
0.20
0.80
0.25
1
0.32
1.25
13(0.32)
0.40
1.6
16(0.4)
Code
Ra
UK BS 1134-61
(μ in)(μ)
1(0.025)
2(0.05)
Code
Ra (μ in)(μ)
1(0.025)
GERMANY DIN4763-60
Code
Ra
Rz
(μ)
(μ)
0.01
0.04
0.016
0.063
0.025
0.10
0.04
0.16
0.063
0.25
0.10
0.40
0.16
0.63
0.25
1
0.40
1.60
2(0.05)
3(0.08) 4(0.10)
8(0.2)
6(0.16)
8(0.2)
16(0.4)
10(0.25)
0.50
2
20(0.5)
0.63
2.5
0.8
3.2
32(0.8)
1
4
40(1)
1.25
5
1.6
6.3
63(1.6)
2
8
80(2)
2.5
10
3.2
12.5
125(3.2)
4
16
160(4)
5
20
6.3
25
8
32
10
40
12.5
50
16
63
32(0.8)
63(1.6)
125(3.2)
250(6.3)
0.63
2.5
1
4
1.6
6.3
2.5
10
4
16
6.3
25
10
40
16
63
25
100
40
160
63
250
100
400
160
630
250
1000
25(0.63)
50(1.25)
100(2.5)
200(5)
250(6.3)
500(12.5)
500(12.5)
800(20) 20
80
25
100
32
125
40
160
125
200
63
250
80
320
250
400
1000(25)
1000(25)
S
1600
2500
CHINA
ITALY
SWITZERLAND VSM 10321-62
GB 1031-83 ≈ISO 468-3
Ra (μ)
0.008
Rz Ry (μ)
Code
Ra (μ)
0.04
0.012
0.05 0.025
Ra (μ)
N1
Ra (μ)
Rz (μ)
0.08
0.025
0.10
0.125
0.04
0.16
0.05
0.20
0.063
0.25
0.05
N2
0.01
0.05
0.02
0.10
0.04
0.20
0.08
0.40
0.16
0.80
0.32
1.60
0.63
3.20
1.25
6.30
0.025
0.063
0.02
0.032
Code
0.032
0.01
0.016
POLAND PN 58/M 042-51
UNI 13963-60
0.05
0.08 0.08
0.32
0.1
0.10
0.40
0.1
0.125
0.50
0.12
0.16
0.63
0.20
0.80
0.2
0.25
1
0.25
0.32
1.25
0.40
1.6
0.50
2
0.63
2.5
0.6
0.8
3.2
0.8
1
4
1.25
5
1.2
1.6
6.3
1.6
0.2
0.4
N3
N4
N5
0.16
0.3
0.4
0.5
1.6
N6
N7
0.5
1
2.5
10
Code
2
8
3.2
N8
2.5
10
2.5
3.2
12.5
3
4
16
4
5
20
6.3
25
6
8
32
8
10
40
12.5
50
16
63
20
80
25
100
32
125
40
160
125
200
63
250
80
320
250
400
6.3
12.5
2
N9
5
20
10
40
20
80
5
N10
10
12
25
50
N11
25
40
160
80
320
N12
CHINA GB 1031-83 ISO 468-83
JAPAN JIS B0601-70
≈ Ra (
μ)
μ)
Rz Ry (
0.008
0.032
0.01
0.04
0.012
0.05
0.016
0.063
0.02
0.08
0.025
0.10
0.032
0.125
0.04
0.16
0.05
0.20
Code
μ)
Ra (
μ)
Rz (
(0.0125a)
μ)
Rmax (
(0.05S)
0.05a 0.1Z
0.1S
0.2Z
0.2S
Code
0.063
0.25
0.08
0.32
0.10
0.40
0.125
0.50
0.16
0.63
0.20
0.80
0.25
1
0.32
1.25
0.40
1.6
0.50
2
0.63
2.5
0.8
3.2
1
4
1.25
5
1.6
6.3
2
8
2.5
10
3.2
12.5
4
16
5
20
6.3
25
8
32
10
40
12.5
50
16
63
20
80
25
0.1a
0.4Z
0.4S
0.2a
0.8Z
0.8S
0.4a
1.6Z
1.6S
0.8a
3.2Z
3.2S
1.6a
6.3Z
6.3S
3.2a
12.5Z
12.5S
(18Z)
(18S)
25Z
25S
35Z
35S
50Z
50S
(70Z)
(70S)
100
100Z
100S
32
125
140Z
140S
40
160
200Z
200S
125
200
63
250
280Z
280S
80
320
400Z
400S
250
400 560Z
560S
6.3a
12.5a
25a
(50a)
S
(100a)
Parameter Factor Rt
8.7
Rz
7.2
Rz ISO
7.6
Rmax
8.0
Rp
3.6
RPM
2.9
RMS
1.1
Surface Roughness Value Equivalents
The Waviness is the measure of surface irregularities with a spacing greater than that of surface roughness. These usually occur due to warping , vibrations , or deflection during machining. ASME B46.1 ASME Y14.36M - 1996 Surface Texture Symbols ISO 468:1982 “Surface roughness — parameters. Their values and general rules for specifying requirements.” ISO 4287:1997 “Surface texture: Profile method — Terms, definitions and surface texture parameters.” ISO 4288:1996 “Surface texture: Profile method — Rules and procedures for the assessment of surface texture.” Includes specifications for precision reference specimens, and roughness comparison specimens, and establishes requirements for stylustype instruments.” ISO 8785:1998 “Surface imperfections — Terms, definitions and parameters.” ISO 10135-1:CD “Representation of parts produced by shaping processes — Part 1: Molded parts.”
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