with an M22 it's large enough that you might be able to simply measure it on the existing bolt with a ruler. The common thread pitch on M22 would usually be 2.5mm, but could also be 1.5 or 2mm for a fine pitch, according to this: ISO metric screw thread - WikipediaHow does one determine thread size on metric bolts? The web search hasn't made it clear. TEK was unable to tell me what was shipped because they said that it can vary depending on what's on hand. I need an M22 nut but I need to figure out what kind of threading I need.