Two wrenches, both nominal size ​5⁄8 in, with a diagram superimposed to show the logic that allows them both to be labeled the same when their actual sizes are clearly different (across-flats distance vs screw diameter). The larger wrench in this photo is from the 1920s or earlier; its face was polished to allow the size stamp to be visible in the photograph.
Remember when we stated there was an exception to the big air power torque? This is it: Ingersoll Rand’s 1/2-inch drive W7150K2 packs a whollop. It has a maximum output rating of 780 foot-pounds and it’s powered by a 20-volt Lithium Ion battery. Part of the secret to it’s big power is the rare earth magnet motor. This isn’t an inexpensive impact wrench, but the kit includes two batteries along with a charger.

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As it is, the tool has a very effective 2-position power button. In position 1, the power is limited to 100 lb/ft for when you need accuracy and a gentle touch. Setting 2 unleashes the dogs of war and allows you to crank out the full 700 lb/ft of torque for unrivalled power. There is no rusted or over-tightened bolt on earth that is going to be able to resist that level of power!
And its steel lined casing will help to protect it from any workplace mishaps that could occur. Additionally, you’ll definitely appreciate the 780 ft-lbs of reverse torque that the machine is capable of generating, as well as the 1100 ft-lbs of nut busting power that it can produce. This product is truly innovative and produces amazing power, making it the highest quality on the market and sealing its place in our list as top choice
We know it can be difficult to sort through all of the great products they have available to you on the market today – after all, there are a lot of great brands to choose from. But luckily for you, we’ve taken the time to put together a list of the top 10 cordless impact wrenches on the market, as well as a breakdown of what makes each tool so great.

chain wrench A self-tightening wrench with either a chain or strap of metal, leather, or rubber attached to a handle, used to grip and turn smooth cylindrical objects (such as automotive oil filters). It relies entirely on friction between the strap or chain and the object to be manipulated. Similar to a pipe wrench, but uses a chain similar to a drive chain or strap, instead of an adjustable jaw. The links of the chain have extended pegs which fit into grooves in the front of the handle, with one end of the chain attached permanently to the handle. This is used in situations where pipe wrenches cannot maintain a proper grip on an object such as a wet or oily pipe. Larger versions of chain wrenches are sometimes known as "bull tongs" and are used with large diameter pipe such as is used deep wells. specialty
The Craftsman C3 Heavy Duty Impact Wrench Kit is a great tool for anyone looking to find a device that is capable of meeting all the demands of their job and is built with strong, durable materials that will last. The powerful tool comes with built in LED lights that enable you to work late into the night and a powerful battery with an impressive run time. The Craftsman C3 Heavy Duty Impact Wrench Kit enables you to work quickly and efficiently with a powerful motor to unscrew even the most difficult nuts and bolts. You’ll love the way the Craftsman is able to revolutionize your work and quickly see why we find it to be one of the best buys on the market.
The Bosch IWH181-01 is great for contractors that need a sturdy device capable of getting the job done. The set is equipped with everything you need to take on heavy duty projects that require some serious torque to unlodge stubborn nuts and bolts. The device has an impressive design that helps to make work an easier and more efficient task that you can look forward to. No longer will you have to dread the tedious work of unscrewing difficult bolts. Instead, you’ll be able to work longer and smarter with the built in LED lights and lighter weight. It’s a great tool that will keep up with you and is built to last - definitely one of the best investments you can make.
The Craftsman C3 Heavy Duty Impact Wrench Kit is a great tool for anyone looking to find a device that is capable of meeting all the demands of their job and is built with strong, durable materials that will last. The powerful tool comes with built in LED lights that enable you to work late into the night and a powerful battery with an impressive run time. The Craftsman C3 Heavy Duty Impact Wrench Kit enables you to work quickly and efficiently with a powerful motor to unscrew even the most difficult nuts and bolts. You’ll love the way the Craftsman is able to revolutionize your work and quickly see why we find it to be one of the best buys on the market.
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The  Porter-Cable PCC740B is one of the best tools on the market for contractors and workers who need to be able to quickly and efficiently remove nuts and drive in bolts. The design of the device is expertly done and allows you to hold the machine during extended work periods without tiring out. You’ll be able to appreciate the expert craftsmanship that went into completing this device when you take advantage of the 330 ft-lb torque or 1,650 impacts per minute that you can generate while using this tool. With all the great features, including the ½ inch hog ring, you’ll quickly learn to appreciate this top quality machine.
An over-tightened or rusted nut or bolt that’s stuck can be one of those things that makes you realize you need to add a new tool to your kit. One of the best models for the job is a cordless impact wrench. This useful equipment has more torque than most drills and it can take care of a stuck nut or bolt in a matter of minutes, saving you time and frustration. Find out more about this handy tool in our cordless impact wrench buying guide.

When it comes to specific jobs, you can find wrenches to help you complete them. Torque wrenches, strap wrenches and pipe wrenches let you get the perfect amount of force without overtightening. Without the right wrench for the job, you risk stripping the bolts and damaging your work in progress. Ratcheting wrenches are perfect for getting jobs done quickly. Many will often feature a standard crescent wrench end in combination with the ratchet, effectively doubling the number of wrenches you have.
Many mechanics probably have the MAC Tools BWP151 in their tool arsenal, and rightly so. This is a very powerful impact gun, and it shows. In the end, the MAC BWP151 finished with 81.4 points in our shootout. In the power category, it and the DeWALT finished neck and neck, in 3rd and 4th place, so it delivers plenty of power. The MAC Tools impact should have done much better in our speed (repetitive power) testing, but it seemed to have a fraction of a second longer lag, from the time you pull the trigger until the gun starts.
Box-end wrenches have ends that enclose the nut and have 6, 8, 12, or 16 points inside the head. A wrench with 12 points is used on either a hexagonal or a square nut; the 8- and 16-point wrenches are used on square members. Because the sides of the box are thin, these wrenches are suitable for turning nuts that are hard to reach with an open-end wrench.
A total length of barely 5 inches and a weight of less than 3 pounds means this tool is one of the few things around that is actually smaller than your Dad’s… ego. Jokes aside, if you need a tool to fit into tight spaces, this could be the one for you. It also boasts a comfortable ergonomic grip, a 3x speed power selector for effective control and the brushless engine we like to see.
When it comes to the Makita XWT08, you can’t go wrong with this purchase. While it finished sixth with 78.7 points, only nine points separated 2nd to 6th. If you are Makita fan, then you’ll be proud to own the XWT08 as well. Power is ample, and it finished 2nd in real-world testing, with the repetitive power (speed) I-beam test, running off all 10 nuts in just 12.6 seconds.
For more  than 100 years, professionals have relied on Ingersoll Rand for quality and performance on the toughest jobs. Our advanced engineering and manufacturing have a standard of excellence often copied, but never matched. When it comes to assembly tools, industrial tools, cordless tools and vehicle service tools, don't settle for less. Count on genuine Ingersoll Rand tools, accessories, and equipment.
And its steel lined casing will help to protect it from any workplace mishaps that could occur. Additionally, you’ll definitely appreciate the 780 ft-lbs of reverse torque that the machine is capable of generating, as well as the 1100 ft-lbs of nut busting power that it can produce. This product is truly innovative and produces amazing power, making it the highest quality on the market and sealing its place in our list as top choice
If you really (Really) need brute force, look at this Air Cat Nitro Cat. It delivers an amazing 1,000 blows-per-minute delivering all the speed of a 1/2-inch drive tool with 3/4-inch drive power. They are engineered with the Extreme hard-hitting, twin-clutch mechanism. The housing is aramid-reinforced and it keeps the weight at only 4.7 pounds. By the way, it has a torque rating of (get this) 950 foot-pounds. (Image/Summit Racing)

Impact wrenches are available in all sizes and in several styles, depending on the application. ¼" drive wrenches are commonly available in both inline (the user holds the tool like a screwdriver, with the output on the end) and pistol grip (the user holds a handle which is at right angles to the output) forms, and less commonly in an angle drive, which is similar to an inline tool but with a set of bevel gears to rotate the output 90°. ⅜" impacts are most commonly available in pistol grip form and a special inline form known as a "butterfly" wrench, which has a large, flat throttle paddle on the side of the tool which may be tilted to one side or the other to control the direction of rotation, rather than using a separate reversing control, and shaped to allow access into tight areas. Regular inline and angle ⅜" drive impact wrenches are uncommon, but available. ½" drive units are virtually only available in pistol grip form, with any inline type being virtually impossible to obtain, due to the increased torque transmitted back to the user and the greater weight of the tool requiring the larger handle. ¾" drive impact wrenches are again essentially only available in pistol grip form. 1" drive tools are available in both pistol grip and "D handle" inline, where the back of the tool has an enclosed handle for the user to hold. Both forms often also incorporate a side handle, allowing both hands to hold the tool at once. 1¼" and larger wrenches are usually available in "T handle" form, with two large handles on either side of the tool body, allowing for maximum torque to be applied to the user, and giving the best control of the tool. Very large impact wrenches (up to several hundred thousand foot-pounds of torque) usually incorporate eyelets in their design, allowing them to be suspended from a crane, lift, or other device, since their weight is often more than a person can move. A recent design combines an impact wrench and an air ratchet, often called a "reactionless air ratchet" by the manufacturers, incorporating an impact assembly before the ratchet assembly. Such a design allows very high output torques with minimal effort on the operator, and prevents the common injury of slamming one's knuckles into some part of the equipment when the fastener tightens down and the torque suddenly increases. Specialty designs are available for certain applications, such as removing crankshaft pulleys without removing the radiator in a vehicle.

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