![]() They also said to store it in a separate case to prevent collision with other tools and to recalibrate it about once a year. However, most tool manufacturers recommend keeping your torque wrench clean and not dropping it. Torque wrenches are durable tools, so they don’t require a lot of maintenance. Frequently Asked Questions Do torque wrenches require maintenance? Sometimes, handles will have plastic or rubber grips on them to prevent the tool from slipping out of your hand during use. HandleĪ longer handle allows you to maintain more control and apply pressure more evenly. For example, if a torque wrench has a range of 25-250 feet, it might only achieve its stated accuracy starting at 45 feet, which is 25% of the range. It’s common for it to only be quoted between 20% and 100%. It’s also important to note that accuracy for a click wrench isn’t quoted over the tool’s whole range. Wrenches that use IV measurements are more accurate. ![]() FS tells you the allowable error over the full range of the tool, while IV tells you the allowable error at the stated value. The accuracy of a torque wrench will be stated as Full Scale (FS) or Indicated Value (IV). A mechanical torque wrench will have one or two of these measurements, but a digital one might have all of them. Occasionally, you’ll find a torque wrench that’s measured in inch-pounds or kilograms per centimeter. Torque is usually measured in foot-pounds on the imperial scale or Newton-meters on the metric scale. Measure the size of the fasteners you’re using for your project before purchasing a torque wrench. A ½-inch drive is common for automotive use, but manufacturers also make ¼-inch, ¾-inch, and ⅜-inch sizes. However, they don’t stop the user from overtightening-the user has to stop themselves once they hear the beeping or see the flashing.ĭrive size refers to how big the piece that fits over the fastener is. Digital torque wrenches can be accurate up to four decimal places and can sometimes store old readings. Additionally, when you reach the desired torque, the tool beeps or flashes to alert you. It has an LCD screen that tells you what the torque is. Digital: This type of torque wrench is fairly new to the market.Instead of the wrench alerting you when it’s reached the desired torque, you’ll have to read the dial for your torque measurement. Dial: Dial wrenches look like click wrenches with an analog dial on them.Cam-over: This type of torque wrench has a built-in mechanism that releases pressure as soon as the torque is reached, preventing you from overtightening.Break-over torque wrenches make it difficult to accidentally overtighten the fastener, but it is possible. Break-over: This is similar to a click wrench, but it has a hinged section, typically near the socket head, that “breaks” when the torque is reached.Instead of stopping at the first click, some people tighten the fastener too much by waiting until the wrench clicks a second time. It’s easy to use and durable, but some people use it incorrectly. It makes a clicking sound when the required torque has been reached. Click: This is the most common type of torque wrench.There are five main types of torque wrenches. This buying guide explores each of these factors to help you make an informed purchasing decision. In addition to the type, you’ll also want to consider a torque wrench’s drive size, unit of measurement, accuracy, and ease of use.
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