Impact Wrenches are the workhorses in the automotive industry. Be it the assembling plants or garages/workshops, you can see dozens of wrenches in action. While there are powerful and reliable Electric Impact Wrenches, Pneumatic Impact Wrenches are the preferred choice in many workshops. And if it is a pneumatic tool, then you also need an air compressor to “power” the tool. If you are planning to buy an air compressor for your garage/workshop, you might be wondering “What Size Air Compressor Do I Need for Impact Wrench?”.
In this guide, we will see all the factors you need to consider when picking an air compressor to run an impact wrench. After that, we will see how the size of the impact wrench or how often you use it affects the choice of air compressor.
Finally, we will see some generic answers to the important question: What Size Air Compressor Do I Need for Impact Wrench?
Outline
An Impact Wrench is perhaps the most common and popular air tool in an automotive workshop. It is also known as Impact Gun or Rattle Gun.
A typical application of the Impact Wrench is to remove or fit lug nuts on a car to remove or replace tires. These lug nuts often need a lot of torque to loosen or tighten them and Impact Wrenches can deliver that.
While there are electric impact wrenches, automotive workshops prefer Air Impact Wrenches (among other air tools). Some reasons for this choice are:
An Air Impact Wrench can rotate in clockwise as well as counter-clockwise directions. A valve in the tool controls the amount of torque it applies.
Speaking of torque, an impact wrench’s torque is dependent on the tool as well as the pressure of air fed by the air compressor.
Air Tools such as Impact Wrenches, Drills, Grinders, etc. operate using high-pressure compressed air.
The system usually consists of an air compressor, pressure regulator, air hose, and different types of air compressor fittings.
An electric motor compresses air and stores it in a metal tank. With the help of a pressure regulator, you can control the amount of air pressure the tank outputs.
Now, let us focus on the main question in the discussion; what size air compressor do I need for impact wrench? To answer this question, we need to take a look at a couple of important things.
The first one is the drive size of the Impact Wrench. Air Impact Wrenches are available in 4 common drive sizes:
Impact Wrenches with different drive sizes have different airflow requirements. Speaking of airflow, we measure it in cubic feet per minute, or CFM. Most air tools require a certain CFM of air at 90 psi pressure while running free.
Here are the typical CFM ratings for different drive sizes.
So, it is important that you check the size of your impact wrench and its minimum CFM ratings recommended by the manufacturer.
Note that these are the minimum CFM values. The air compressor you choose must deliver at least this amount of airflow at 90 psi pressure for the impact wrench to run freely.
This means the air compressor must have a slightly higher airflow than this value. But how much more?
As a simple rule of thumb, the airflow from the air compressor must be at least 3/2 times the minimum requirement of the impact wrench.
For example, a 1/2″ drive Impact wrench usually has a requirement of about 5 CFM airflow at 90 psi. So, the airflow rating of the air compressor at 90 psi should be 3/2 * 5 = 7.5 CFM.
The size of the air compressor’s tank determines how long you can use the impact wrench continuously without switching on the motor.
You can find air compressor tanks that can hold 80 – 100 gallons of air. At the same time, there are also smaller tank sizes such as 6 gallons and 16 gallons.
So, what’s the optimum air compressor tank size? This depends on how long you want to use the air tool but as a rule of thumb, we usually recommend an air compressor tank size of at least 5 to 6 times the airflow requirement of the tool.
For example, if the impact wrench has an airflow requirement of 5 CFM, then the tank size of the air compressor must be at least 25 to 30 liters (6 – 8 gallons).
In this case, you can expect the impact wrench to operate for about an hour or an hour and a half.
Note that these are just recommendations. If you run multiple tools and use air tools for a lot of jobs, then a larger tank size will definitely be beneficial.
Let us now see all the important things you need to consider while purchasing an air compressor.
As we mentioned earlier, the drive size of the air tool, which is an Impact Wrench in this discussion, plays an important role in determining the air compressor you need.
Impact Wrenches with smaller drive sizes (3/8” or 1/2″) need less airflow than tools with larger drive sizes (3/4” or 1”).
We measure the airflow in CFM (cubic feet per minute). Check the CFM ratings of the impact wrench as well as the air compressor.
If you want to use the Impact Wrench for a continuously long duration, then you need an air compressor that can hold a large volume of air.
So, the tank size of the air compressor becomes crucial. You can get air compressors with small tanks (2 gallons), medium size tanks (6 – 16 gallons), and large tanks (more than 30 gallons).
Another important factor that impacts your buying decision of an air compressor is the number of air tools you use simultaneously. If you own or operate a large garage or workshop where you have a crew that works on several vehicles at the same time, then it is better to invest in a large industrial air compressor.
They have the airflow capacity to feed multiple tools and also a larger tank that can hold significantly large volumes of air.
Air compressors and air tools are loud machines. Irrespective of the size of the garage, we recommend you place the air compressor far away from the main work area and run hoses through the workshop.
If you have a small garage, then consider building a tiny shed outside the garage to house the air compressor so that we keep its noise to a minimum level.
Another important thing is the size of the air compressor. If you have a large workshop with separate space to put the air compressor, then you can get away with a large-size air compressor.
But for small workshops or garages with already congested space, a small air compressor is a better choice.
Automotive and construction are the two main “types” of work that use air tools. For smaller jobs such as painting or drilling, you don’t need a super powerful air compressor.
But for using high torque air tools such as impact wrenches, hammers, etc. you need a strong air compressor.
Air Impact Wrenches are very important tools in automotive garages and workshops. Be it in small garages or large workshops, impact wrenches are a necessity to finish the job easily, efficiently, and effortlessly.
But if you are wondering, what size air compressor do I need for impact wrench, then we covered this in this guide. We saw some basics of impact wrenches and air compressors.
After that, we saw the factors that determine the size of the air compressor. Finally, we gave a couple of simple ways to calculate the right air compressor you need for “powering” an impact wrench.
With the idea of an impact wrench that suits your need as a mechanic, or a weekend DIYer in mind, the next step is to get the air compressor for a power source. The air compressor, of course, has to perfect the operation of the impact wrench, which makes getting the right one a little confusing.
Just so you know, when discussing pneumatic tools, it is inevitable to hear CFM at least a few times or more.
This is because air compressors are measured in PSI meaning “Pounds per Square Inch” or deliverable CFM meaning “Cubic Feet per Minute. If your main aim for it is to power an impact wrench, then one between 2.5 to 7 CFM will do just fine.
Randomly picking a size of air compressor from the lots of available options without some considerations will most likely result in worse performance.
The airflow or CFM rating is based on the motor horsepower, tank size, and pump capacity. But in many instances, you do not have to worry about the exact one to get, since each unit of an impact wrench and other air tools have their unique CFM indicated by the manufacturer on the box.
The basic criterions for predicting the size of air compressor for an impact wrench is the Power rating in horsepower (HP), the Pounds per Square inch, Cubic feet per minute, and tank size in liters.
The Horsepower is the first determinant since they are not created equally. If you need your impact wrench for small jobs like pumping tires, then 1.5HP air compressor will get the job done. But do not assume that the amount of horsepower alone defines the efficiency of the air compressor.
Most impact wrenches require air compressors with a minimum of 90 PSI to work correctly and operate between 80 to 100 PSI. Small compressors with horsepower between 1.5 and 3 will produce between 120 and 150 PSI, so air problem is not a problem here.
The CFM describes the amount of air the tool will need to pass through per minute for it to work. So clearly, the air compressors output should match the required CFM of the impact wrench.
Lastly, the tank size measured in gallons influences the length of time the impact wrench can run.
Compressed air is one of the most beneficial, versatile, and available forms of energy. Most air tools have an adjustable torque control and variable speed to increase the versatility and compared to other traditional ones, the air tools last longer.
The sizes of the tanks are measured in gallons. It critically determines the CFM to keep the impact wrench functioning as it should. Just like other air tools like grinders or paint sprayers, the impact wrenches may also have to run for an extended period – which means they need large tanks.
If you have confirmed the Power rating, Pounds per Square inch, Cubic Feet per Minute, the next consideration will be the tank size. Try not to be confused about a large tank based on how much work time you can get for an impact wrench – Focus more on the usage.
If you use your impact wrench intermittently, then a large tank will be fine, but if you need to make continuous use, then a smaller container with a better motor and pump will work.
What size of air compressor do I need for other air tools?Asides from the impact wrench, the air compressor can work for other tools like nail guns, paint sprayer, grinders, air sanders, and more. But determining the size for an air compressor for any air tool has a lot to do with the amount of air needed to power the device.
Air compressors work based on the air contained in the storage tank, which means the volume of compressed air will impact how well the tool will work. When the tank is filled and has a higher CFM than the equipment, the tank compressor will not have to run so much to maintain the airflow.
Almost all air tools have specific requirements for both air volume and pressure. You should get a larger tank if you are planning on using an air tool that requires continuous air like paint sprayers or grinders.
But if you use air tools that need only intermittent running like nail guns, then a smaller air compressor is suitable.
Most DIY compressors are explicitly designed to power one tool at a time, but in many cases, the aim for the air compressor can be to run multiple devices simultaneously.
In situations like this, you can use a larger and more commercial compressor and get your airflow by to gather the individual CFM of each air tool.
Which is the smallest air compressor for impact wrench?Having an air compressor with tanks and pump that is large enough to produce sufficient CFM for your impact wrench is the goal.
You will also have to move your air compressor at least once in a while; so a portable one is more desired.
Smaller air compressors of Portable sizes will mean lesser capacity and lesser weight.
To figure the minimum size of air compressor needed, you need knowledge on how much airflow the impact wrench requires to function. Once you find the CFM requirement of the air tool either from the manual or technical specification and meet them, then your equipment will run at its best.
How to calculate the CFM requirement and Tank Size?Although this information will already be in your user’s guide or manufacturer’s website, if you want a rough guide on finding the minimum required CFM and tank size of for the compressor, you can do these:
Remember, this method is only a rough guide, and the larger the tank of the air compressor, the better the performance of the air tool.
Of course, there are portable air compressors for impact wrenches, but the bigger the gallon, the more air you can have. One of the popular types is the pancake air compressor with small tanks of between 3 to 6 gallons.
The pancake air compressors are suitable for smaller space of work and can that fits anywhere better than the 30-gallon stationary units.
The capacity of the air compressor is not the only essential factor in deciding the effectiveness; it merely determines the running time. A pancake air compressor can run an impact wrench, but only for a short period as long as the air in the tank lasts.
The tank size keeps the air supply at the right level while you are working with the air tool and also determines the continuity. You should know that large tanks take up a lot of room.
What is an air compressor used for mostly?Impact wrenches are mostly used in garages, mechanic workshops, tire shops, or break shops, so it is not surprising to find an air compressor near always.
If you want to pull a tire or two, a 4 or 5-gallon compressor will do, but when it comes to removing everything, you will need one with a size of around 15 gallons.
They are useful for complete automotive repairs, maintenance, hobbies, crafts, and construction. Let’s see some of the benefits of the top-quality air tools. The air compressor is a versatile application based equipment and can handle different tasks in homes, workshops, basements, factories, and garages.
With the different model and sizes available there are some for small functions like inflating pool toys, sports equipment or air mattress and others to power tools like nail guns, drills, impact wrenches, staplers, spray guns and sanders.
The use of the air compressor stretches widely across different occupational fields. Some of them include
After all these, you must now know the size of the air compressor that you need for your impact wrench. The air compressors come with a storage tank to store the air they need, and the amount of air it determines the performance of the impact wrench.
So the ultimate goal is to get an air compressor that is capable of powering the impact wrench.
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Pneumatic Impact Wrench Manufacturers, Suppliers-WAY WIN TOOLS TRADE COMPANY.
WAY WIN TOOLS TRADE COMPANY is one of the renowned names involved in Taiwan manufacturing, supplying and exporting a full range of Pneumatic Impact Wrench which is of high quality and unique formula. In order to ensure the quality of our range, we manufacture this using high quality material, which we procure from certified suppliers. Our products are precisely designed with the utmost care by our excellent team in order to meet international quality standards and they are ideal for use in a variety of locations. Our range can be purchased in large quantities and at the most competitive prices.
To shop high quality Pneumatic Impact Wrench at the best price. What you need to know about Pneumatic Impact Wrench from Taiwan
company, manufacturer, supplier and factory We have advanced production equipment, strong technical force to professionally produce
Pneumatic Impact Wrench
Model - HY-3960A
1/2” Air Wrench
XI-3960A
Full Power
Specifications:
Nut Break Torque: 1,400 ft-lb/1,898 Nm
Maximum Torque: 1,000 ft-lb/1,356 Nm
Operating Torque: 150~800 ft.lb/203~1.085 Nm
Free Speed: 7500 rpm
Weight: 4.0 lbs/1.82 kg
Length: 6.4”/165mm
Air Consumption @ Free Speed 90psi: 4.8 cu. ft/min/136 l/min
SPL/force:92/103 dBA
Air inlet in:1/4”
Minimum hose size:3/8”(10mm)
Packing: Carton+color card+shrink , shrink,10 pcs/ctn/18.2kg/19.2kg/1.5'
Description:
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Product List
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Impact wrench set
WIN6001
WIN6001 impact wrench set of 16 Material: Connector: Chrome-molybdenum steel, with chrome plating and color plating High Quality Source: TAIWAN Packing: Blow mold body+color sleeve+shrink,shrink,3set/ctn/15kg/16kg/1.6’ Impact Wrench Specifications: Blade Size: 1/2” Free Speed: 7500 RPM Operating Torque: 720 ft-lb(814 Nm) Maximum Torque: 950 ft-lb (1288 Nm) Inlet (NPT): 1/4” Clutch Type: Twin Hammer Minimum Hose Si: 3/8” Air Consumption: 35 scfm (227 L/min) Weight: 2 kg Length: 198 mm Content :10pcs-1/2”Dr.
Impact socket:12,13,14,15,16,17,18,19,21,22(mm) -1/2”Doc.Universal Joint 3pcs-1/2”Doc.Wheel Nut Head 85mm(L):17,19,21(mm)1pc-1/2”Doc.Composite Pneumatic Wrench Description: Composite body construction for light weight High performance double impact mechanism Ideal for tire work, body shop, engine work, woodworking, furniture repair Forward/reverse power control with 3 forward power settings, full reverse power. Good helper for tire change and engine repair
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Pneumatic Impact Wrench
HY-1361A
3/4” Air Wrench HY-1361A Compact size Full power Robust double hammer construction Double F/R button Pen actuation Large speed dial Specifications: Nut Break Torque: 1,800 ft-lb / 2,440 Nm Maximum Torque: 1,500 ft-lb / 2,034 Nm Operating Torque: 1,200 ft-lb / 1,627 Nm Free Speed: 5000 rpm Weight: 7.5 lb / 3.4 kg Length: 8.3 ”/210mm Air Consumption @ Free Speed 90psi:6.3 cm3/178 l/min SPL/Force:94/105 days BAV Air inlet in.:3/8”Minimum hose size:3/8”(10mm) Packing:Carton box+color card+shrink,shrink,4pcs /CTN/13.
6kg/14.6kg/1.3' Description: Reliable double hammer mechanism Professional grade button allows quick, one-handed changes. Compact design yet powerful for convenient use The function trigger provides excellent forward and reverse control. Cylinder with steel sleeve for durability Textured grip that increases hold when hands are greasy and greasy Ideal for tire work, body shop, engine work, woodworking, furniture repair
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Air Impact 1 Inch
HY-2162A
1” Air Impact Wrench HY-2162A Compact Monster Power Specifications: Breaking Torque: 2,600 ft-lb/3,525 N-m Free Speed: 5000 rpm Weight: 22 lbs/10 kg Length: 21.5”/545mm fpm/226 l/min Air intake: 1/2” Minimum hose size: 1/2” Packing: Carton+color card/1pc/CTN/10kg/11kg/0.9' Description: Double hammer mechanism Durable gravity-cast front cover 4-setting power regulator The best power-to-weight ratio for super-industrial applications
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Angle Grinder Wrench
HY-1982L
2-in-1 Angle Grinder Free HY-1982L Specifications: Rolock disc: 2” Velcro disc: 2” Force: 0.
5 HP Free speed: 20,000 rpm Angle: 90 degree Rear exhaust with special ultra-quiet muffler 83dBA Heat shield housing Air consumption @ 90 psi: 3.3 CFM Length: 170mm (6.7”) Weight: 0.75 kg (1.65 lbs) Packing: Carton + color card + shrink, shrink, / 20pcs / CTH/15kg/16kg/0.9' Description: Unique quick-lock design locks the spindle with the push of a button. The special muffler reduces the noise level to 83 dB. Composite handle eliminates vibration 2 in 1 tool with polishing & grinding
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Pneumatic Die Grinder
HY-1045R
Low Noise Straight Grinder HY-1045r Specifications: Assemble size: 1/4”, 1/8” (6.3 mm) Power: 0.5 hp Free speed: 22,000 rpm Rear exhaust with special 83dB ultra-quiet muffler Built-in speed control Heat shield housing Air consumption @ 90 lbs per square inch:3.3 cubic meters per minute Length:190mm(7.48”)Weight:0.77kg(1.69lb)Packing:Carton+color card+shrink,shrink,20pcs/ctn/15.4kg/16.4kg/1’ Description: Unique quick-lock design locks the spindle with the push of a button.
Requires only 1 wrench instead of 2 when changing attachments Composite handle eliminates vibration Wrench on tool for easy replacement (no need to run to toolbox for wrench) Lever throttle for feather control Compact and lightweight
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Tire Buffer Tool
HY-1246C
Short Buffer for Pneumatic Tires HY-1246C Specifications: Free Speed(rpm):6000Sound Pressure/Force(dBA):91/102Horsepower:0.3HP(0.22KW)Torque Range:2.5NmExhaust:Rear Air Consumption@90psi:2.8 cfm/20 scfm Weight: 0.47 kg (1.04 lb) Dimension: (L) 144×(W) 60 mm Recommended air pressure: 90 psi Packing: Carton+color card+shrink,shrink,/30pcs/ctn/14.1kg/15.1kg/1’ Description: Ideal for patchwork, rough patches for recoating. Rear exhaust draws air away from the work area Large cutting force makes work more efficient Safety trigger to prevent accidental triggering Easily fits in your hand. Semi-circular polishing wheel for maximum surface preparation
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Air Tire Buffer
HY-944
2 in 1 Air Grinder & Tire Buffer HY-944 Specifications: Free Speed(RPM): 6000 Sound Pressure/Force(dBA): 88/99 Horse Power: 0.
3 HP(0.22 kW) Torque Range: 2.5 Nm Exhaust: Rear Air Consumption@90 psi: 2.8 cfm/20 scfm Weight: 0.52 kg (1.15 lbs) Dimension: (L) 165×(W) 60 mm Recommended air pressure: 90 psi Packing: Carton+color card+shrink,shrink,30pcs/ctn/15.6kg/16.6kg/1’ Description: Low speed high torque for tire patch preparation Compact design for working in confined spaces. Rear exhaust directs air away from the work area Safety trigger to prevent accidental triggering Ideal for patchwork, rough patches for recoating and polishing in tight spots such as a bumper or doorknob
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Pneumatic Grinder
HY-1548AL
4” Angle Cutter/Chopper Extension HY-1548AL Gravity Cast L-Head Alloy steel rotor for durability Specifications: Blade size: 4 inch / 100 mm Free speed (rpm): 18500 rpm Center hole flange: 16mm Cylinder power: 0.7 HP Sound pressure power dBA: 83 dB Average air consumption cfm min: 3.8 CFM/108L/minWeight:1.53kgLength:355mmAngle Height:66mmMinimum hose size in/mm:3/8” /10mmPacking:Carton+color card+shrink,shrink,10pcs/ctn/15.
