In North American English, wrench is the standard term. The most common shapes are called open-end wrench and box-end wrench. In American English, spanner refers to a specialised wrench with a series of pins or tabs around the circumference. (These pins or tabs fit into the holes or notches cut into the object to be turned.) In American commerce, such a wrench may be called a spanner wrench to distinguish it from the British sense of spanner.
Automotive repair shops each have their own unique selection of tools, but almost all have one tool in common: the impact wrench. An impact wrench, which may also be called an air gun, air wrench, or torque gun, is a power tool that puts a high-torque output in the palm of your hand, without much work on your part. Rather than tightening a bolt by hand, which would not give you enough torque to ensure it was completely tight and safe, you can use an impact wrench to torque it and ensure it is tight. The wrenches have a socket wrench design, which is often used to repair automobiles and other heavy equipment. It can also be used in construction projects or product assembly when the products are large and heavy.

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.
A reliable cordless impact wrench from Grainger can help you get the big jobs done whether you work in construction, automotive, or another industry that requires powerful torque. New battery technology helps provide cordless impact wrenches with consistent power and quick recharge. Choose from the brands you use everyday and add this valuable tool to your toolbox. Find a cordless impact wrench that can fit your applications at Grainger.Close
Don't settle for less. Ingersoll Rand cordless and pneumatic impact wrenches are highly regarded by professionals everywhere, whether for automotive services or industrial production. Our advanced engineering and excellent manufacturing standards are often imitated, but never duplicated. Ingersoll Rand impact wrenches are well known for their durability and compact profile, delivering rugged reliability and the best power-to-weight ratios on the market. Our industrial production class impact wrenches have an innovative ergonomic design and are manufactured using a proprietary hardening and treatment process…all adding up to the longest lasting, hardest hitting impact tools in the business.
Open-end and Flat Wrenches. The most basic type of wrench, open-end and flat wrenches have open jaws that slip onto nuts and bolts. Because they can be slim and short, these wrenches are especially useful in tight spaces. They’re not adjustable, so they’re sold in wrench sets of all sizes. They’re available in both SAE sizes, which are expressed in fractions of an inch, and in metric sizes. 
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.
We have nine different cordless high torque impact wrenches from eight different manufacturers, including a couple of the tool-truck brands. Snap-on declined to participate in the best cordless impact wrench shootout, so their placement will remain a mystery. Maybe you can ask your local driver where they would fall. Back to the ones who did enter their trusty steeds.
Where the Ingersoll Rand did suffer a bit is in the feature set area. This is where the age of the tool showed. There is no worklight, it’s only a single speed/mode, and it has a brushed motor. We would love to see a remake of this gun, using the great features as in our review of the Ingersoll Rand W5132 Cordless Impact Review. If Ingersoll Rand will release a new 1/2” high torque, with a brushless motor, multi-speed features, and the halo LED worklight, then first place may be much closer.

This 2767 Gen 2 delivers the power and does it over and over, without a hiccup. Added features, such as the bolt removal mode, set apart the Milwaukee Gen 2 from the rest. Earning 97.6 points from a possible 100, this second generation high torque impact from Milwaukee beat 2nd by more than 11 points. The added LED worklight, shining from the battery area onto the work surface is a nice feature as well. At only $449 and a 5-year warranty, this also makes it the best value as well.
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.
	box-end wrench	ring spanner	A one-piece wrench with an enclosed opening that grips the faces of the bolt or nut. The recess is generally a six-point or twelve-point opening for use with nuts or bolt heads with a hexagonal shape. The twelve-point fits onto the fastening at twice as many angles, an advantage where swing is limited. Eight-point wrenches are also made for square-shaped nuts and bolt heads. Ring spanners are often double-ended and usually with offset handles to improve access to the nut or bolt.	common

Agonizing; extremely distressing, unpleasant, or emotionally disturbing; having a severe effect on one's feelings. What a gut-wrenching loss for the young athlete, who poured her heart and soul into this match. Kids today are so desensitized that images of violence their grandparents would have found gut-wrenching now barely even register a response.
Inside the tool is a rotating mass. A cordless impact wrench uses batteries to generate power. The motor builds up energy using the rotation and then pushes it into an anvil that’s located at the end of the tool. This creates an enormous amount of torque, more than can be produced by any human. The mass, which is shaped like a hammer in the best cordless impact wrenches, continues to rotate, so the operator only feels a tiny amount of the impact.
Cordless Impact Wrenches, Cordless Shear Bolt Wrench, Drive Size 1/2 In., Drive Configuration Straight, Max. Torque 48 ft.-lb., Battery Included, Voltage 14.4, Series Standard, Cordless Tool Battery Type Li-Ion, Brushless Motor No, Anvil Impact Action Mechanical, Max. Blows per Minute 3200, Max. No Load RPM 2200, Cordless, Handle Type Pistol Grip, Battery Capacity 3.0Ah, Tool Length 14 In., Tool Weight 5 lb., Clutch Style Anvil, Battery Included 13P981, Battery Pack Replacement 13P981
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)
In the chancel was a twisted stone column, and the captain told us a legend about it, of course, for in the matter of legends he could not seem to restrain himself; but I do not repeat his tale because there was nothing plausible about it except that the Hero wrenched this column into its present screw-shape with his hands --just one single wrench.

We love the DEWALT DCF880HM2 for its simple yet easy to use design and ability to make work easier. It comes with an impressive energy efficiency system that allows you to have 33% more charge than other standard battery packs are capable of attaining. This translates into about 24 hours of work time that you’ll be able to use before the batteries need to be recharged again. You’ll also be able to take advantage of the hog ring anvil incorporated into the design. It makes it easier to do socket changes and get on to other work.
Keep in mind that all rechargeable batteries slowly lose their charge when not in use, but some batteries lose their charge much faster than others. The capacity of a battery used in a power tool is usually expressed as the amount of amperage hours (Ah) that it can deliver. “Ah” is different than the overall amperage rating of the tool. Here, Ah represents how much energy flow the battery can hold, not the level of current during operation. Keep in mind that a higher Ah means longer battery use between charges.
One of our favorite features on the device is the brushless motor that allows it to produce impressive output power while still staying cooler than many of its rivals on the market. And if that weren’t enough, it boasts the ability to generate up to 700 ft-lbs of fastening torque and up to 1100 ft-lbs of nut busting torque making it a great tool for anyone who finds themselves trying to remove stubborn nuts on a regular basis.
The Milwaukee 2763 has very few notable faults. One issue is that the work light LED is just under the front of the impact. Commonly, users will use their other hand to brace the front of the impact, this will block the LED so it’s nearly useless. The 2763 delivers great power, and it did well in our speed test as well. Milwaukee sets itself apart with the 5-year warranty, and you can buy it online, your tool store, or in the big box stores.
I bought this on a whim when I walked by it at my neighborhood Denver Walmart. I am a professional mechanic, and this tool has been perfect for light to heavy workload. Using it in a shop where I need it for at least ten cars a day, It works great for every task, especially taking lug nuts off of wheels. I did break it within a year, however, which is Campbell Hausfeld's factory warranty, and I contacted them and I got a completely free replacement, and really great service in the process. No, it's not the absolute best impact wrench, but it is worth much more than the price, as I have had many other brands for way too much money, and this one beats all of them that were worth even up to 300 bucks. Above all, the service and the warranty were the best parts of my experience, and I highly recommend it.
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