堵转力矩或静止力矩是指当机械设备转速为零（堵转）时的力矩。马达、蒸汽机及液力变矩器在堵转时都可以产生力矩。

交流马达在堵转时（有交流电压输入，但马达不转动）仍然可以产生力矩 ，不过因为此时电流为最大值，可能会有马达过热或受损的问题。

「最大允许堵转力矩」是指马达在堵转条件时可以长期输出此大小的力矩，并且不会造成马达的毁坏。

Stall torque is the torque produced by a mechanical device whose output rotational speed is zero. It may also mean the torque load that causes the output rotational speed of a device to become zero, i.e., to cause stalling. Electric motors, steam engines and hydrodynamic transmissions are all capable of developing torque when stalled.