How to Use an Impact Wrench by Air Compressor
Posted in: Commercial,Residential
On February 7, 2022

An impact wrench is a type of wrench on steroids that has been around for a long time. You can use them to remove or tighten lug nuts, big bolts, and frozen or rusty fasteners. But, how to use an impact wrench by air compressor? 

To run a half-inch impact wrench, you should have an air pump with four to five CFM at 90 PSI. To eliminate delays between activities, I would advise proposing purchasing a 20-gallon compressor. You can find other sizes in the middle of this guide.

In this article, we’ll teach you how to operate an air compressor for impact wrench and how to determine the air needs of your impact wrench to choose the suitable air compressor. Let’s get started.

How to use an impact wrench by an air compressor

Use an Impact Wrench by Air Compressor


Though utilizing an air impact gun is simple, we have developed some instructions to help you get started, even if you’re a newbie.

Make sure you have everything you need

To loosen and tighten works, you’ll need an air impact wrench. You’ll also need one airflow system. 

The airflow system comprises a single air compressor that supplies air to the impact wrench through a flexible pipe that links the compressor pipe to the contact wrench. It is better to utilize an engine with a CFM larger than the impact wrench’s SCFM.

For example, suppose you had a single Ingersoll-Rand 231C half-inch Super-Duty Gas Angle Grinder with an air draining of 4.1 CFM at 90 psi. You must select a pneumatic with a CFM rating of 4.5 or above. You may search for an air compressor use chart online for more info.

Of course, you must keep the environment fresh and provide a filtration system or one oil container set. The cleaner only lets air through while retaining water from both.

So when airflow pushes the oil container, the lubricant condenses and flows out of the gas contact wrench, lubricating it. The lubricant keeps the air wrench functioning efficiently and for an extended period.

You must also arrange the hose to link the compressor to the impactor. The area is determined by where you’d like to use the pump stand’s impact. That’s it.

Compressor Configuration

Use an Impact Wrench by Air Compressor


Explore to ensure that everything is in working order. Typically, the high pressure is set as the factory default and follows the functionality of the compressor. 

It has a maximum pressure of 125-150 psi. Check the pressure regularly, draw up the trigger, regulate the force until it hits 90 pounds per square inch, and stop—press enter.

Assembly the Adaptor

Install and tighten one fast connection with an impact wrench; first, use a soft touch to coil around the common thread to prevent air from escaping out. Use the compressor output hose for this step.

Connect the hose to the compressor by inserting two negatives of the fast connection into the two segments of the hose.

Tightening and loosening

Attach the appropriate socket to the impact wrench, then lock off the socket with the locking pin if your angle grinder has one. To reverse the direction of rotation, turn the rotary switch on the impact housing. 

Place the adapter over the screw that has to be loosened. To initiate the impact wrench, press the trigger.

Work on Testing

When using an angle grinder, you should test it to function correctly. Press the impact driver’s trigger to see how much the impact gun travels.

Deliver the trigger switch and modify the velocity of the windy wrench gun by altering the impact driver’s pressurization flow switch and pulling the trigger again. The essential thing is expected if the speed of the contact wrench is modified.

Why would you use an air compressor to power an impact wrench?

Use an Impact Wrench by Air Compressor


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Air compressor is amongst the most useful, adaptable, and readily available energy sources. Most air tools offer adjustable speed controllers and torque control to maximize versatility, and they last longer than traditional tools.

  • There are no pollutants in unintentional air leaks.
  • Lower heat is produced as a result of a longer life span.
  • Control of variable torque and speed.
  • The power-to-weight ratio is high.
  • There is no danger of an electric or shock fire.

Essential Safety Guidelines

Before working with your impact wrench, you have to follow some precautionary measures. So here we go.

For Personal Security

  • You should keep hair, clothes, and gloves away from moving parts since they might become entangled in them.
  • Do not use pneumatic tools if you are weary or under the influence of alcohol or drugs, drink, or medicine.
  • Prevent unintentional beginning. Before attaching to the air stream, check that the trigger is switched down.
  • When connecting a mechanical tool to an air source, ensure the trigger is turned off.

In Working Environment

  • Maintain a clean and tidy working environment at all times.
  • Because sparks are produced when pneumatic tools ignite combustibles, do not use compressed air in explosive atmospheres.
  • Use a pneumatic instrument to keep the kids, pets, and bystanders at bay.


Use an Impact Wrench by Air Compressor


Can a small air compressor run an impact wrench?

It is preferable to have an air pump with large tanks and pumps to provide adequate CFM for your impact wrench. Smaller air pump sizes imply less capacity and weight. As a result, a tiny air compressor cannot power an impact wrench. Even the simplest impact wrench needs a minimum of 1-1.5 CFM to work. Therefore, there will be insufficient pressure to deliver the required CFM.

How much PSI is needed to run an impact wrench?

Proper Air Pressure (PSI) – Most air tools on the market are intended to operate at 90 pounds of force, also known as PSI. Surprisingly, most air compressor for impact wrench requires a minimum of 90 PSI to function correctly. It would be preferable to have a more excellent shut-off pressure air compressor. When turning down a compressor at 100 PSI, pressure drop in the line should be considered.

What size air compressor do you need for air tools?

The size of the air pump required for an impact wrench is usually affected by the size of the impact wrench itself. For a half-inch impact wrench, you’ll need an air compressor with a 4-5 CFM flow rate at 90 PSI.

For example, the best air compressor for an impact wrench with a one-inch drive will require 10 CFM at 90 PSI. A half-inch drive will require 4 CFM at 90 PSI, and a ⅜” drive will require 3 CFM at 90 PSI.

How many CFM do I need to run an impact wrench?

Use an Impact Wrench by Air Compressor


Cubic Feet per Minute (CFM) is the unit of measurement for airflow. We need to compute the air compressor’s minimum CFM rating because the manufacturer specifies the suggested CFM of the contact wrench. Multiply the impact wrench’s CFM by 1.5 to achieve this.

For instance, if your impact wrench has a flow rate of 4CFM, the Compressors will be 1.5 x 4 equals at least 6CFM of airflow from the compressor.

Final Verdict

After all these, you must understand “how to use an impact wrench by air compressor.” The air compressors come with a storage tank to hold the air they require, and the quantity of air it contains influences the impact wrench’s capability.

CFM, horsepower, and PSI will decide whether or not the compressor is suitable for you. So, keep these considerations in mind while you look for an air compressor. The final objective is to have an air compressor powerful enough to power the impact wrench.

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