What is the striking similarity between click type and pneumatic torque tools?

Both click type and pneumatic torque tools utilize a calibrated clutch mechanism, which is essential for providing precise torque output when attaching fasteners. This mechanism allows the tool to disengage once the predetermined torque setting is reached, preventing over-tightening and potential damage to components.

In click-type torque wrenches, the user hears a clicking sound that indicates the set torque has been achieved. This gives direct feedback to the user, ensuring the correct amount of torque is applied. Similarly, pneumatic torque tools may have a clutch system that provides similar disengagement and control over the torque applied, although they are powered by compressed air rather than manual effort.

The other choices, while related to torque tools, do not accurately characterize both types. Digital calibration is more specific to electronic tools, not universally applicable to both types. Automatic wrenches typically refer to tools that do not require manual adjustment for torque settings, and while adjustable torque settings may apply to both types, it is the clutch mechanism that is the fundamental similarity between them.