Segma snaps...

[TinkerTailor]

43 minutes ago, NVLeatherWorx said:

The official designation for the Segma snap is Line 16. The 21 and 22 that OTB is sending to you relates to the length of the eyelet (this is the post that you set the stud onto); the 21 is 3/16" long and the 22 is 1/8" long (OTB lists it as 4/16" but we all know the math on that one).   OTB has a wide array of snaps to choose from so if you ever order any of them in bulk pay close attention to the lengths of the posts.  Even the Line 20 and Line 24 snaps from them can be customized to length which blows any of the other suppliers out of the water because they only send them out in one size configuration.

 

Yes, the ligne/line designation is for diameter of head.

[TomG]

I did not know a lot of this.  I wondered about the Ligne/Line designations but never took the time to learn the history. 

Thanks for the education!

[TinkerTailor]

I have to apologize, I simplified a bit. A ligne is 1/12 of a french inch which is 1/16 of a US inch officially, and was a common measure in clockmaking.  Button makers used the thickness of a candlewick pounted flat as a ligne, which was closer to 1/40 of an inch. The US chose this as the measure for a line. The ligne is also used to measure hatband width and is closer to 1/11". It's one of those units like horses being so many hands high that has stuck around in only one place just to confuse us.