impact wrench

Gas powered impact wrench

Impact wrench do a great job of tightening and loosening blots, lugs nuts and rusted fasteners.  They provide a very high rotational torque that regular drills are simply not capable of and deliver high torque output with minimal exertion by the user.

They are used in the automotive and construction industry, though are loved across many other trades where a high torque output is needed.

 How Does an Impact Wrench Work?

The impact wrench replaces your ratchet wrench or breaker bar, highly increasing your productivity and making tightening and loosening nuts and bolts a much quicker and easier process. They get their immense torque from a hammering mechanism in the motor that delivers extremely strong and quick concussive blows. This creates a huge amount of force which enables them to loosen even the toughest nuts and bolts.

The DCF899 is one of DeWalt’s most popular impact wrenches.


Top Features:


  • Ideal for heavy-duty fastening applications
  • Hog ring for more efficient torque delivery
  • Fan cooled brushless motor
  • 3 Speed and torque setting



Max. Torque: 950 Nm

Breakaway Torque: 1625 Nm

Power Output: 610 Watt

No Load Speed: 0 – 400 / 1200 /1900 rpm

Impacts per Minute: 0 – 2400 imp

Bit Holder: 1/2″

Things to Look for When Choosing an Impact Wrench

We have listed below some main features to look out for when choosing an impact wrench. Of course, the features you go for depends on the applications you will be carrying out.

Look out for features such as ‘high torque’. The higher the torque (measured in newton meters (Nm)) the more twisting force the machine can produce

Brushless motors offer a longer runtime and better performance

Impact wrenches with a hog ring socket provide more efficient torque delivery

Models with multiple torque settings allow you to tailor the torque output to the application

What’s the Difference Between an Impact Driver and an Impact Wrench?

Impact wrenches are not to be confused with impact drivers.

The impact wrench is a fastening tool which uses a square drive that you can attach sockets to in order to tighten and loosen bolts. The impact driver is a screwdriving specialist that has a 1/4″ hex collet that accepts 1/4″ hex shank bits. It is typically used to drive long screws and bolts. They are much more efficient at driving screws than standard drill drivers

Pros of Using Impact Driver for Drilling

  • Compact Design:

Arguably the best advantage for the compact design of impact drivers is that you can get them into tighter spaces compared to most standard drills. They also are more ergonomically designed, and well balanced.

  • Easy on your Wrist:

The impact driver has nearly zero kick-back, thanks to the impact hammer mechanism inside. This means you can get more work out of them while not straining your hand, wrist, or arm as much. Of course, this will depend on the type of material and amount of work you need to accomplish.

  • Less Switching:

You can use the impact driver for both drilling and driving screws, which makes it rather versatile. But more importantly, you can use the same tool to do both jobs. This means less switching and less time in getting the job completed.


  • Lightweight:

In addition to the compact design, impact drivers are also lighter and easier to work with compared to many standard drills. This means that you strain your arms less while getting more accomplished with the impact driver.

  • Quick Release

The impact driver has a quick-release system, so you can change bits faster. It is faster than the self-centering chuck on the cordless drills.

The quick tool changing will speed up the efficiency of your work, so you get more accomplished in less time.


Cordless vs Air Impact Wrench

You already know the main difference between the electric impact wrench and the pneumatic one is the power source. But how do they affect the end user? Here is a quick comparison chart of the different types of impact wrenches.

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