A slider crank mechanism is shown in the figure. At some instant, the crank angle is 45° and a force of 50 N is acting towards the left on the slider. The length of the crank is 40 mm and the connecting rod is 80 mm. Ignoring the effect of gravity, friction and inertial forces, the magnitude of the crank shaft torque (in Nm) needed to keep the mechanism in equilibrium is __________ (correct to two decimal places).