Originally Posted by
miamijim
Here's a Campy document verifying grade 100 bearings, Campy didn't state this very often, I think I've only seen it 2 or 3 other times.
You didn't by any chance work on the mars orbiter a while back?
As the others have said, you made an error in translating metric to inch and (according to the literature) it seems that Campy does in fact use grade 25 (or possibly 10) balls.
Whew, I'm glad we got that straightened up.
BTW- while we're discussing balls, I remind you that lot tolerance is much tighter than overall tolerance, so it's important not to mix lots (lots of debate about that) because if you mix 2 lots of grade 25 balls you made one lot of grade 100. In practice one smaller ball in a bearing isn't a big deal, but on larger one is more serious. So for those who pay for grade 25, remember to discard the end of a lot before opening the new one.