We study holographically four-dimensional conformal field theories with a universal helical deformation. We construct numerically the dual black holes and we show that at zero temperature they flow in the IR to exactly the same CFT. The deformation gives rise to a finite, non-zero DC thermal conductivity along the axis of the helix, which we determine analytically in terms of black hole horizon data. The AC thermal conductivity along this axis exhibits Drude-like peaks.