Mod1 is a Metric pitch. Like .8 is 32P. A little math and you can find out. I'm pretty sure it comes out to about 24P though.
Edit: I did a little digging and found
this converter. It was a PITA to install, but I installed it and if I did it correctly (I think I did since I double checked myself using the .8 to 32P conversion. It came to 31.something) it came out to 25.4P.