Rotate tires -- torque and lugnut question

I have a brand-new torque wrench. It is time to rotate my tires.

So, I find that 21mm is the socket size for lug nuts? Are they pretty much the same across the board for all Japanese models?

Can I use an extension handle and still be accurate on the torque?

In the past I always stomped and jumped up and down as hard as I could on the stubby Toyota lug wrench and figured that was tight enough.

 

Thanks for the replies! I actually have a 1/4-inch torque wrench, a 3/8-inch and now the 1/2-inch.

I originally bought Harbor Freight for the 1/4 and 3/8 back in April. But the "spring button" that holds the socket on the wrench was "stuck" inside on the 3/8" and the 1/4" did not click at all.

So, I returned them and ended up buying some Texton brand. They both work great. But, knowing I have to rotate the tires, bit the bullet and bought another Harbor Freight wrench -- the half-inch -- last week when they had it on super-duper, extra special $10 price.

I only plan to use it on tires, so I figure it does not have to be too accurate.

BTW -- my stomping and jumping did snap a stud on my old Corolla years ago. Denny, my mechanic thought it extremely funny. At that time I probably weighed 120. I may be a few pounds heavier, but since I don't bicycle as much, I may not have as much leg strength as I used to have.

Anyway, Patrick here on the board has been telling me to get torque wrenches for years -- and while they may not be the best, I do finally have at least a couple that seem to work. I'll see how it goes with the new Harbor Freight tool this weekend.