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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How does a ratchet actually work?

Every well-stocked toolbox contains at least one ratchet. There is a good reason for this: unlike a screwdriver, a ratchet can be used to tighten fasteners with ease, even in confined spaces.   Definition: what is a ratchet? In toolmaking, a ratchet or reversible ratchet is a tightening tool that applies torque in one direction only, so there...

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The most common screw head drives

To make a secure bolted connection, it is not only the size of the tool (profile size) that matters – it's just as important to know the most common fastener profiles, their advantages and disadvantages. The following article presents the most important types of fastener heads: Slotted-head screw Cross-slotted screw head (Phillips recess,...

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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...

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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...

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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...

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Torque

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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