Torque Auditing Examples

In this example, we will discuss auditing a bolt used to secure a seat belt anchor. A 12 millimeter bolt is used, and the bolt is installed using a powered installation tool that applies 90 Newton Meters of torque.

A previous design study found that 90 Nm of torque applied to the fastener in the application yields the desired 8,000-pound clamp load on this joint.

The powered tool is equipped with a built-in transducer that can read a maximum torque value of 135 Nm, and the tool is adjusted to release when it senses that 90 Nm of torque at the socket.

One way to verify that the anchor bolt is actually being installed to 90 Nm (or 8,000 pounds of clampload) is to monitor maximum torque seen at the socket during the installation cycle.

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