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Ningbo Tractatus Co., Ltd

Per Chenyu Li / hcfire360 July 2021

Comparatio Tabulae mittentes Roughness

nominal
value Ra

micrometre(um)

50

25

12.5

6.3

3.2

1.6

0.8

0.4

0.2

0.1

0.05

0.025

microinch(uinch)

2000

1000

500

250

125

63

32

16

8

4

2

1

Roughness number

N12

N11

N10

N9

N8

N7

N6

N5

N4

N3

N2

N1

Superficiem  dura fuisse, cave   vocabula   Microinches

Metric Equivalent Micrometers

1/4(0.25)

0.006

1/2(0.5)

0.013

1

0.025

2

0.05

4

0.1

8

0.2

16

0.4

18.9

0.48

32

0.81

63

1.6

119.5

3.04

125

3.18

250

6.35

500

12.7

1000

25.4

2000

50.8