Choose the Right Tightening Torque Using this Guide

In assembly and manufacturing, it is necessary to pay attention to the efficiency of production. To avoid problems and produce safe, dependable, and economical products, you need to recognize the importance of torque control in terms of fasteners. But, if you are not sure which torque to use when you tighten bolts, here is a guide that can help you:

Why Torque is Important

Bolts are necessary for assembling machines and making them function. Proper torquing is paramount to ensure the bolt functions as expected. Tightening the bolts appropriately leaves the material slightly stretched just enough to prevent the bolt from going beyond its limit that can weaken it and impact its load capacity. Meanwhile, under-torqued bolts will create a gap between workpieces which can result in joint failure.

How to Determine Torque Requirements

Establishing the right torque specifications before using fasteners on some materials is important. The expected maximum load that should be placed on the fastener must be taken into consideration. This can be carried out by using a calibrated torque tools designed to control torque. This tool is used for doing a destructive test.

Moreover, a torque calculator can also be used for determining the rough tightening torque. Although this tool may not provide exact results, it can verify some of the results obtained when determining torque requirements. In order for the calculation to work, you should provide information like bolt diameter, bolt strength, and friction coefficient.

Testing the Torque

After having the torque specifications on hand, verify the torque values’ accuracy by testing them. This includes using a calibrated hand torque wrench. To ensure you have a quality, dependable, and safe project, you need accurate torque values. Here’s how to test your torque:

  • First movement test. When the fastener is tightened, a force must be applied on the torque wrench.
  • Loosening test. This test can be performed in the same way as the first movement test. But, in this test, you need to apply force in the opposite direction in order to loosen the fastener.
  • Marking test. This includes marking the fastener and the surface that must be clamped. Wait until the marks match up before you stop loosening and tightening.

Using the Right Tools

When measuring and controlling the torque applied to fasteners, you can use tools such as electric screwdrivers, torque testers, pneumatic screwdrivers, torque sensors, torque wrenches, and more. In general, you can determine the specific tool to use based on the kind of materials joined and the fasteners to be used.

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