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Bolt Torque
What is it?
Wayne Scraba / autoMedia.com
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“What is not generally known or understood is that the break-away or break-loose torque is considerably less than the applied torque. This means that the torque required to loosen a bolt previously tightened to 90-foot-pounds would be considerably less than the 90-foot-pounds of applied torque. In view of the above, it is easy to see why one of the torque wrenches could be considered inaccurate. A torque wrench should be tested on a torque wrench-testing machine to determine its true accuracy.”
As you can see, bolt torque isn’t a complex topic, but it’s pretty clear there’s a bit more to torquing fasteners than you might first think. Before you break out the easy-outs and thread repair kit, follow the recommendations made by the Pros. It’s something you won’t regret.
Resources
Mac Tools, 505 N. Cleveland Ave., Westerville, OH 43082, 800-MacTools. Automotive Racing Products, 1863 Eastman Ave., Ventura, CA 93003, 800-826-3045
Copyright autoMedia.com 2000-2009
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It’s no secret that nuts, bolts and other fasteners come in all different types, shapes and sizes. The truth is, this isn’t a coincidence. It’s by design. Each fastener is designed to do a specific job in conjunction with a specific material. In essence, every type and grade of metal has a definite limit to which it can be safely stressed or stretched.
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One of the most common types of torque wrench you’ll find in motorsports or in professional shops is a “clicker” variety such as this. By definition, a torque wrench is a device that is used to measure or limit the amount of torque that is being applied at a given point (on a specific fastener).
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This is a close up of the business end of a torque wrench manufactured by Mac Tools. Adjustment is straightforward: The lock ring is slid toward the handgrip and then the knurled handle is turned to the exact amount shown on the graduations. Setting the tool is like reading a micrometer: It’s simple and extremely accurate.
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Torque wrenches are precision measuring instruments. Treat them accordingly. It’s a wise practice to store the torque wrench in the container it is shipped or sold in. These Mac Tools torque wrenches are sold in protective plastic cases. And that’s where they should take up residence until you need to use them.
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