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A lug nut is also called a wheel nut and they are typically used to attach a wheel to a vehicle. Lug nuts are commonly found on trucks, cars, and other vehicles with large rubber tires. They are a fastener with a rounded or tapered end.
The reason you would use a torque wrench rather than a conventional wrench for any project is to ensure that you tighten the bolt to a predetermined torque setting.
You cannot get the same level of accuracy by using a conventional wrench, as conventional wrenches do not come with the calibrated settings of a torque wrench and you wind up guessing the torque level. This lack of precision is fine when it comes to, say, simple household repairs, but for safety purposes it is important to use a torque wrench in the manufacturing or repair of things like transportation devices, as properly connecting the parts can be a safety issue and a matter of life and death.
How Can a Torque Wrench Be Used on Lug Nuts?
Following these steps will help you properly use a torque wrench to tighten lug nuts:
Calibrate the torque wrench
Either calibrate or re-calibrate a torque wrench you already own if you know how or purchase a torque wrench for lug bolts that is already correctly calibrated for you. You can typically use a higher quality torque wrench for longer before it will need to be recalibrated. Calibrating the torque wrench is important because if your torque measurements are not accurate it defeats the purpose of using the torque wrench and can jeopardize the safety of your vehicle.
Determine the proper setting for the torque of your lug nuts
The correct torque settings for your project will depend on your bolts and vehicle. You must determine which foot-pounds setting is needed for your needs in order to ensure safety. You can usually find the proper torque setting for your vehicle and its bolts from a quick Google search, or you can ask your vehicle dealer or consult the owner’s manual.
Check your bolts
Before you use them, you’ll want to make sure that your bolts are working. A common mistake people make is using stripped or broken thread bolts, which won’t torque properly. Check your bolts for damage or wear before using them with your wheels.
Use a torque wrench to tighten each bolt until you have reached the correct torque level. Click torque wrenches are probably the most commonly used for this type of project, and if you use this type of wrench you will hear it click. Only let it click once before you immediately stop turning, otherwise, you may over tighten the bolt, which can be dangerous.
Check torque every 100 miles
For maximum safety, always check the torque settings after every 100 miles of use. Look for any movement of the bolts.
What Size Torque Wrench Should I Use?
Like most tools, you can get many different sizes and styles of torque wrenches that are suited to different projects. One of the best ways to determine which size torque wrench you will need is to match the torque wrench to the socket set. The more torque you require, the more inch-pounds torque you need in your torque wrench. When torque rating increases, your torque wrench size will also increase, which could potentially make moving the wrench difficult. You may want to have multiple torque wrenches in different sizes.
Here are four common sizes of torque wrench:
- 1/4" – Good for smaller bolts and nuts that need only 50-250 feet to pounds
- 3/8"– Best for most automobile related requirements between 15-75 feet to pounds
- 1/2"– Suitable for bigger bolts and nuts that need 30 - 250 feet to pounds
- 3/4"– This is the largest size is best for tasks requiring maximum torque
There are many types of torque wrenches, and it can be difficult to determine the best one for your particular project. Using a torque wrench is very helpful in the manufacturing and repairs of automobiles, and these vehicles usually require the use of lug nuts to attach the wheels.
Matching your socket set to your torque wrench is the best way to make sure you are using the correct size. You may also want to have a variety of sizes on hand for extensive work. In general, a click torque wrench with a ⅜ inch drive will be your best bet for tasks that require 15 to 75 ft.-lbs. of torque, or a ½ inch drive for larger trucks.