Abstract: A polished rod rotator uses a new method and mechanism to rotate a string of sucker rods relative to a string of oil well tubing to high degrees of rotational angle and achieve large rotator torque. The activation and resulting rotation torque is achieved through axial impact directly by the weight of the sucker rod string at the end of the downward movement of the pumping equipment. The rotator is a two-part assembly, one part is attached to a well-head stuffing box and the other is attached to a polished rod, having a hollow body with spiral slots with rollers. With the downward movement of a beam, the two parts dock through their docking surfaces, while the weight of sucker rods forces the rotator to move down using rollers in spiral slots rotating the polished rod along with the sucker rods until the beam's movement is complete. With the upward movement of the beam, the parts undock rod rotator is static waiting for the completion of pumping cycle.