I see nothing to indicate that this jack is USA made. Virtually all of MSC's NuLine products are foreign made. The only thing on p2365 of the catalog that they show to be US made are the two jacks in the lower LH corner.
As far as the Grainger/MSC comparison, I have a Northern band saw, cheap one that uses the 64-1/2 inch blades. I use a flex back 14-18 variable pitch and they work well and last a long time. I was using Starrett blades from MSC, had bought two, am on the second one and wanting another spare. MSC wants $29 for it, Grainger has Morse brand, exact same Matrix II material, same pitch, everything, but its $17. Thats alot of difference. I used to think Grainger was high, but you have to shop.
Charles