I'm checking on a large gear box with Timken taper roller (metric) bearings with a prefix X.
I have the bearings P/N but have not been succesful at finding the bearings dimentions and/or their defect frequencies. Any inputs on where to look such information?

Have you tried the Timken website? http://www.timken.com/timken_ols/bearings/GST/WEB_gst/GST_BrgPeriodicFrq.asp

Thanks for the link Joe. I have been looking for this site for awhile, (I couldn't remember where I had found it!)

Thank a lot Joe. It is very helpful.