JohnG 41 Posted August 2, 2009 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 Share this post Link to post Share on other sites
RolexAddict 1 Posted August 2, 2009 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 Share this post Link to post Share on other sites
JohnG 41 Posted August 2, 2009 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. Share this post Link to post Share on other sites
greg_r 95 Posted August 2, 2009 Instant sticky. Very useful. Thanks mate! Share this post Link to post Share on other sites
JoeyB 0 Posted August 2, 2009 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? Share this post Link to post Share on other sites
JohnG 41 Posted August 2, 2009 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). Share this post Link to post Share on other sites
onzenuub 325 Posted August 2, 2009 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? Share this post Link to post Share on other sites
jdoe 0 Posted November 15, 2011 Oke John, where did you get it from? Share this post Link to post Share on other sites
PinionMinion 51 Posted February 12 Bumping a 14-year-old thread- waiting on a client so I put this into a spreadsheet in a couple of different formats (pdf, XLS, and Open document)- hopefully, I can get all of them to upload. Hope it helps someone. Watch Movement size conversion MM / Ligne/ American Share this post Link to post Share on other sites
