Sorry to take so long to respond to your question. I have been out of town. The owners manual claim class 7 bearings on the my Jet mill. I had been told that Grizzly had class 5, and I also had my doubts untill I read it myself while looking looking at one in their showroom sometime back. They recently opened one close to where I live. Some jet mills have a lighter weight knee and others, mine being one, have the heavy knee, which is a larger casting. All the Grizzly mills seem to have the lighter knee. May not make much difference in HSM use, but it does seem to also have an affect on cost.

<font face="Verdana, Arial" size="2">Originally posted by D. Thomas:
Kevin, just curious how you know for sure that a Grizzly mill has class 5 bearings and a Jet has class 7 ? Reason I ask is, that if this info came from salesmen at either organization it's pretty much like info from a car salesman..i.e. worthless. But if printed specs then it's probably true for that machine at that point in time. </font>