Which type of continuous-drive tool disengages the motor when it reaches torque?

The slip-clutch screwdriver is designed to disengage the motor when a preset torque level is reached. This feature is crucial in applications where overdriving screws can damage materials or lead to improper fastening. The slip-clutch mechanism allows the user to apply consistent torque without risk of stripping the screw or damaging the workpiece by stopping the drive automatically once the set torque is achieved.

This makes slip-clutch screwdrivers particularly effective for delicate tasks or in assembly processes where maintaining specific torque values is critical for performance and safety. Other types of tools mentioned, like impact wrenches and electric screwdrivers, do not typically have this disengagement feature tied directly to torque settings; they continue to drive without a mechanism to limit torque. Pneumatic tools can also be designed to disengage at certain pressures or settings, but slip-clutch screwdrivers specifically emphasize torque control, making this option the most appropriate choice for this question.