What type of tool shuts off its motor once it reaches the desired torque?

The type of tool that shuts off its motor once it reaches the desired torque is a continuous-drive tool. Continuous-drive tools are designed with torque control mechanisms that enable them to monitor the torque applied during fastening. When the set torque level is achieved, the tool automatically stops powering the motor, ensuring that the fastener is neither over-tightened nor under-tightened. This feature is essential for maintaining consistent assembly quality and preventing damage to fasteners and materials.

In contrast, tools that operate continuously without this automatic shut-off feature, like pneumatic tools, may not provide the same level of torque control, leading to variations in fastening. Pulse tools, while effective for certain applications, work differently; they deliver a series of torque pulses and typically require manual intervention to stop. Battery-operated tools can vary widely in design, and many do not possess automatic shut-off capabilities for torque monitoring. Therefore, the continuous-drive tool's specific capability to stop automatically upon reaching the desired torque makes it the correct answer.