Torque Tools
Mechanical Torque Wrenches for Controlled Bolted Connections
A mechanical torque wrench is set to a target value and transfers this value to the bolted connection during tightening. As soon as the set value is reached, the mechanism signals the release point. The tightening process should then be stopped to prevent the desired torque from being exceeded.
The connection to the screw is made using a suitable socket. This allows different sizes and profiles to be used with the same torque wrench. The socket must sit fully on the square drive and match the size and profile of the fastening element.
Before use, check the torque range, scale, direction of operation and condition of the tool. Unless the design and manufacturer’s instructions expressly permit it, a torque wrench is not a substitute for a conventional lever when loosening particularly tight connections. For reproducible results, the tool should be inspected regularly and stored correctly.
Mechanical Torque Wrenches for Sockets
Mechanical torque wrenches for sockets have a square drive onto which suitable sockets are attached. The torque wrench provides the target torque, while the socket establishes the connection to the nut or screw head.
The main advantage of this combination is its flexibility: different sockets can be used for different sizes and profiles. This allows one torque wrench to be adapted to a wide range of bolted connections, without requiring a separate torque wrench for every size.
When selecting the components, the square-drive size, socket size, profile and load capacity must be compatible. The socket should sit fully on the drive and must not be tilted. Suitable extensions or special sockets may be required for hard-to-reach areas. In such cases, check whether the geometry of the setup affects the torque setting.
Set the desired torque according to the tool’s scale or adjustment mechanism. Once the release signal has been triggered, do not apply any additional force. Damaged, worn or unsuitable sockets can impair power transmission and must not be used.
Push-Through Square Drive for Torque Wrenches
A push-through square drive is a square drive that passes through the head of a torque wrench. The socket can be attached to whichever side is required. With a suitable design, this allows the direction of operation to be changed without repositioning the entire torque wrench.
This design is particularly practical when bolted connections must be worked on in both directions or when the tool head needs to allow the drive direction to be changed quickly. The square drive must pass fully through the head and be securely connected to the socket.
When using this type of torque wrench, observe the permitted direction of operation, torque range and suitable square-drive size. Depending on the design, accuracy in both directions may be assessed differently, or accuracy may only be specified for one direction. The markings and instructions for use provided with the relevant tool are therefore decisive.
The socket must match both the screw and the square drive. Before tightening, check that the socket is securely seated, that the wrench is correctly set and that there is sufficient space for the intended direction of operation.