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JohnG

Watch Movement Size Conversion Chart

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JohnG

There are three major ways in which watch movements are measured Ligne, mm, and American.

 

 

 

1 ligne = 2.256 mm.

 

 

 

American movement sizes to Ligne to mm conversion

 

Size Ligne mm

 

18/0 6 3/4 15.25

 

17/0 1 1/8 16.08

 

16/0 7 1/2 16.92

 

15/0 7 7/8 17.78

 

14/0 8 1/4 18.62

 

13/0 8 5/8 19.46

 

12/0 9 1/8 20.32

 

11/0 9 3/8 21.16

 

10/0 9 3/4 22.00

 

9/0 10 1/8 22.86

 

8/0 10 1/2 23.70

 

7/0 10 7/8 24.54

 

6/0 11 1/4 25.40

 

5/0 11 5/8 26.24

 

4/0 12 1/8 27.08

 

3/0 12 3/8 27.94

 

2/0 12 3/4 28.78

 

0 13 1/8 29.62

 

1 13 1/2 30.48

 

2 13 7/8 31.32

 

3 14 1/4 32.16

 

4 14 7/8 33.02

 

5 15 1/8 33.86

 

6 15 3/8 34.70

 

7 15 3/4 35.56

 

8 16 1/8 36.40

 

9 16 1/2 37.24

 

10 16 7/8 38.10

 

11 17 1/4 38.94

 

12 17 5/8 39.78

 

13 18 1/8 40.64

 

14 18 3/8 41.48

 

15 18 3/4 42.32

 

16 19 1/8 43.18

 

17 19 1/2 44.02

 

18 19 7/8 44.86

 

19 20 1/4 45.72

 

20 20 3/4 46.56

 

 

 

Swiss movement sizes, Ligne to mm conversion

 

Lignes mm

 

7 15.79

 

8 18.05

 

9 20.30

 

10 22.56

 

11 24.81

 

12 27.07

 

13 29.32

 

14 31.58

 

15 33.84

 

16 36.09

 

17 38.35

 

18 40.60

 

19 42.86

 

20 45.11

 

21 47.37

 

22 49.63

 

 

 

Common American movement sizes

 

26/0, 22/0, 21/0, 20/0, 18/0, 16/0, 15/0, 14/0, 12/0, 10/0, 8/0, 6/0, 5/0, 4/0, 3/0, 0, 6,, 8, 10, 12, 14, 16, 18

 

 

 

Common Swiss movement sizes ( * sizes are most common )

 

Lignes mm

 

3 3/4 x 6 3/4 9.0 x 15.15

 

3 3/4 x 8 1/4 9.0 x 19.4

 

3 3/4 x 10 9.0 x 21.0

 

*5 1/2 x 6 3/4 13.0 x 15.15

 

*6 3/4 x 8 15.3 x 17.8

 

*7 3/4 17.2

 

8 1/4 18.2

 

*8 3/4 19.4

 

*10 1/2 23.3

 

*11 1/2 25.6

 

12 1/2 28.4

 

16 1/2 36.6

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RolexAddict

John, you should draw a panel with colomns and this should be pinned in the "Watch repair" section

 

just if you have time to do this of course

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JohnG
John, you should draw a panel with colomns and this should be pinned in the "Watch repair" section

 

just if you have time to do this of course

I may do it later, but if someone else wants to - that is cool with me. :morebeer:

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greg_r

Instant sticky. Very useful. Thanks mate!

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JoeyB
John, you should draw a panel with colomns and this should be pinned in the "Watch repair" section

 

just if you have time to do this of course

I may do it later, but if someone else wants to - that is cool with me. :)

What size would a 21J movement be?

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JohnG
John, you should draw a panel with colomns and this should be pinned in the "Watch repair" section

 

just if you have time to do this of course

I may do it later, but if someone else wants to - that is cool with me. :)

What size would a 21J movement be?

Don't know.

 

The chart is for converting from one measure to another - but you have to know the measurement first (in either mm, lignes, or American).

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onzenuub
John, you should draw a panel with colomns and this should be pinned in the "Watch repair" section

 

just if you have time to do this of course

I may do it later, but if someone else wants to - that is cool with me. :)

What size would a 21J movement be?

Don't know.

 

The chart is for converting from one measure to another - but you have to know the measurement first (in either mm, lignes, or American).

Oke John, where did you get it from?

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jdoe
Oke John, where did you get it from?

59.0415.jpg

 

:)

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