Knowledge portal

For more than 150 years, STAHLWILLE has been developing and producing innovative tools that are unique on the market. As a specialist for intelligent torque technology, tool systems and tightening tools, we know what is important.

Our new knowledge portal gives you access to both general and specific knowledge from the tool world. Whether it is the flexible rod principle or torque, this is where we apply our 150 years of expertise to explain – in several articles – technical background knowledge. Experience our tool knowledge.

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Torque-angle tightening

Simple torque-based assembly is a widely used process in the production of bolted connections. However, where requirements concerning the accuracy of the final result are more stringent, torque-angle tightening is often used. This means that the fastener is tightened through a prescribed angle after the snug point or threshold has been reached by...

Controlled tightening

An increasing number of bolted connections have to be tightened to a specified torque and the results documented. The reason is strict safety regulations and quality requirements. It is only a defined bolted connection that can ensure a joint will withstand the anticipated loads in subsequent operation. But that is not all: sensitive materials such...

The flexible rod system

Many mechanical click-type torque wrenches are fitted with a compression spring mechanism. For torque wrenches that use that mechanism, users should reset the torque wrench to »0«, or the smallest value that can be set, if the wrench is not to be used for a while. If it is not reset, there is a real danger that the compression spring will be...

Clicking systems for torque wrenches

In order to produce a bolted connection with an exactly defined preload force, the fastener must be tightened using torque, at least, and, if necessary using torque & torque angle. Controlled tightening is just as indispensable for private individuals as it is for international industrial enterprises in today's world. To enable controlled...


Torque or moment (symbol in physics »M«) describes the turning effect of a force (F) on a member – a fastener, for example. It is calculated by multiplying the force applied – in »newtons« or »N« – by the length of the lever used to apply it to the fulcrum – in »metres« or »m«. The unit used for the resulting moment or torque is N x m, or N·m.

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