Torsion Simulation in 2D axisymmetric

Hi,

I am going to simulate a rod using the structural mechanics module in COMSOL v4.3. The rod is fixed at one end and a torque T is applied in the other end. So the strain is pure torsional.

Can I use 2D axisymmetric to simulate this rod?

If yes, how could I apply that boundary torque? According to material mechanics, I should apply an out-of-plane stress on the boundary, but I can only find Tr (radial) and Tz (axial) when I add a "boundary load".

Thanks

Dan