Close-gap release torque spanners (often also folding keys) are set to a specific torque in advance and give an audible and perceptible signal when this value is reached. Their close-gap release with an angular movement of only around 3° makes them ideal for tight spaces and allows them to be reused quickly after being released.

However, the user must perceive the release point precisely, otherwise there is a risk of exceeding the torque and damaging components or the tool: the lower the torque, the weaker the palpable and Audible signal.

The close-gap release mechanism supports controlled power transmission by clearly signalling the moment the set torque is reached. This enables precise, reproducible tightening of screws. This type of release is therefore particularly popular in applications where accuracy and immediate feedback are crucial for the quality of the screw connection.

Incidentally, the typical cracking noise when the set torque value is reached is a favourite joke for new workshop users: if the cracking noise fails to materialise, they are sent off to get a cracking cartridge.

Instead, the trigger mechanism is realised via the tipping element (the tip cube), as can be seen in the diagram below. The exact dimensions of the tip cube are crucial for the accuracy of the release mechanism