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What is a torque limiting screwdriver or wrench

Torque is the measurement of a turning and twisting force. As an example, it is the force necessary to turn the head of a screw or bolt on all types of assembly applications ranging from small items like cell phones to an automotive chassis and more. As the torque is being applied to the head of the screw or bolt during the fastening process two main forces are at work.

  • We apply a force which is the torque to the screw or bolt head to tighten it.

  • The other force is the tensile or stretch created that runs the length of the screw or bolt.

Together, these two forces are closely related. The more torque that is applied to the screw or bolt head, the more tension (or stretch) is applied to the length of the bolt.

What makes the torque important is that when we apply torque to fasteners, we are clamping parts together. The amount of torque applied will determine how well the fastener does its duty in the long run. If the torque we apply is too little, the fastener will vibrate and eventually loosen. On the flip side, if we apply too much torque the fastener will become too stressed which can break or strip the threads.

Torque Limiting Screwdrivers

A torque limiting screwdrivers and wrenches are engineered with durable aluminum housings for weight reduction and to maximize durability.


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Torque limiting screwdrivers and wrenches feature a unique roller bearing cam which provides smooth, accurate, and consistent performance when tightening fasteners.

When the maximum torque setting is reached, the cam mechanism automatically slips to prevent over-tightening.

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Express Assembly Torque Limited Screwdrivers models that are available for light duty applications including general electronic and computer assembly. Miniature torque limiting screwdrivers offer reliable fastening of the very smallest of applications such as cellular phone assembly.