3/8 vs 1/2 Impact Wrench Comparison: The Ultimate Guide!

The undeniable battle of 3/8 vs 1/2 impact wrench still goes on since they were introduced in the world of power tools. Impact wrenches are important in fastening and removing nuts and bolts in smaller to heavy projects such as automotive production, construction works, industrial works, and more.

However, most people often can’t decide which one is better among them. So, you are also looking to buy an impact wrench, but don’t know where to begin? The most common types are 1/2 and 3/8 impact wrenches are widely used.

In this guide, we’ll help you which one is better in the comparison of 3/8 vs 1/2 impact wrench. 3/8 and 1/2 impact wrench reviews will help you to decide what suits you best according to applications.

What is the difference between ⅜ vs ½ Impact Wrench?

The main difference between 3/8 and 1/2 impact wrench is their power, weight, and their functionality level. The ½ impact is ideal for heavy work in the industry, construction, and automotive production. Whereas, The 3/8 impact wrench is best for works like water pumps, oil pans, cam covers, and other smaller works. Torque output of 1/2 is higher than 3/8 impact wrenches. ½” impact wrench components are also heavier and bulkier as compared to 3/8.

3/8 vs 1/2 Impact Wrench Comparison at a Glance

Tool1/2-inch Impact Wrench3/8-inch Impact Wrench
PowerHighly PowerfulLess Powerful
SizeBigger and heavierSmaller and lighter
WeightAverage 7 lbs.Average 2 lbs.
BatteryMore PowerfulLess Powerful
PrecisionLess PrecisionMore Precision

3/8 vs 1/2 Impact Wrench Comparison Analysis:


The more power output of a tool, the better it is. In terms of power, 1/2 is way ahead of a 3/8 impact wrench. 1/2 wrench powerful motor produces higher level torque for rusty nuts and bolts.

If you’re working on a heavy project, then you need a 1/2 impact wrench for work in heavy torque and heavy pressure. 1/2 is specially designed for heavy projects.

The maximum torque rate of most 1/2 is around 300 ft/lbs. 3/8 delivers a maximum torque of 90 to 100 ft/lbs. That’s a huge difference between power factors of both 1/2 and 3/8 impact wrenches.

Who Wins?

1/2 impact wrenches are significantly better than 3/8 for heavy projects (heavy torque, heavy pressure). 3/8 impact guns are good for projects which require less than 130 ft-lbs.

Size and Weight

Regarding the size, there are two differences between these impact wrenches.

  • A 1/2 comes with a more powerful motor and a bigger size battery. These features add up the overall weight more than its counterpart. It’s common to see 1/2 weighs around 7 lbs while 3/8 wrenches about 2 lbs. The weight difference is less than half.
  • The second difference is particular to dimensions. Components of 1/2 impact wrenches are powerful and larger rendering them bulkier. Design is for providing more torque. While 3/8 impact wrenches are considerably smaller in size. Smaller advantages them to fit in tight spaces.
    The overall size of the wrenches becomes bigger or smaller by the aforementioned properties.

Who wins?

3/8 is better than 1/2 impact wrenches. Weight and size are larger than 3/8 as well as overall heavy torque, battery power, resilience for heavy pressure, and better fastening. 3/8 is smaller and lighter but overall performance is way behind the 1/2 impact wrenches.


3/8 impact wrench is better to perform ideal work in tighter spots due to its compact design. So you can effortlessly work at tighter places to 10 mm or fewer bolts. Furthermore, 3/8 is better for accuracy and precision.

1/2 may turn out to be a good option for more robust power and a longer performance level. You can work to maximum torque. 3/8 might be a good option for tighter places, but power is way behind the 1/2 as well as power and torque level is also behind.

Who wins?

I would say, 3/8 is better than 1/2 due to a better functionality level. Smaller size increases the form factor of 3/8. You can ideally work in tighter places.


For precision works, a 3/8 impact wrench is better due to its compact design. It is famously used for zip nuts, DIYs, woodworks, and other smaller applications.

1/2 impact wrench is more about power. If you’re looking for an impact wrench for heavy works like automotive tasks, lug nut removals, industrial maintenance, suspension works, and constructional works, then 1/2 is a perfect choice. The cordless impact may even be better at doing amazing things.

Who wins?

As we’ve seen, the type of application is an important reason behind the choice of wrenches. For heavy work, 1/2 will be ideal. For a smaller scale, 3/8 will be good. We’ll pick 3/8 due to more domestic smaller applications.


1/2 and 3/8 impact wrenches have ergonomic characteristics that help users in a tight grip for a longer period comfortably. Their structure is similar to guns and comes in more than one shape.

The push-button design of both impact wrenches makes it easier to start and stop just by push or release.
This is all due to mainly these features:
• Soft grips
• Compact design
• Enhanced illumination level in dark areas due to LED lights.
• Variety of speed triggers

Who wins?

It’s hard to decide which is better between them. Some may go for 1/2 and others for 3/8. In terms of design, I guess both are equal. Application type will be the key decider.


As the size of 3/8 is smaller and compact, so it’ll better do the job. You can easily fasten nuts and bolts at tighter spots with a high precision level. Maneuvering is easier due to lights making it an excellent choice to work intricately.

However, you’ll have to compromise for motor and maximum torque. But you can focus tool with all the torque at one point better than 1/2.

The ergonomic, compact, and lighter design of the 3/8 impact wrench also help to easily handle offering more precision.

Who wins?

Our choice is a 3/8 impact wrench due to its compact design, smaller size, and smaller weight to function at tighter spots with great precision than 1/2.

Which one to buy 3/8 vs 1/2 Impact Wrench?

We all know very well how the right tools can make a huge difference in turning a job smoother or a nightmare. When it comes to 1/2 or 3/8 impact wrenches, a choice isn’t always easy to make. Making the right choice according to applications can help you better.

3/8 has a more compact design, smaller in size, and provides more precision and least weight as compared to its counterpart 1/2. But you’ll have to compromise on power. Its smaller size can’t handle heavy pressure and high force.

1/2 impact wrench contains more power and is best to employ for heavy projects as mentioned before. Any but or bolt larger than 10mm will require 1/2. It is also the most commonly used wrench size. Both precision and power are in great balance.

As you’ve seen different sizes, weights, and power, you need to figure out which will better suit your work. Keep in mind the bulkier and heavier size of 1/2 as compared to 3/8. You need to ensure what power level will better do the job.

If we had to choose the size, our probable choice would be a 1/2 impact wrench. About everything is middles in the same size. Power, battery, design, and functionality are compatible with most applications.

Milwaukee Fuel Stubby 3/8″

Milwaukee Fuel Stubby 3/8″ Impact wrench is the most compact wrench. Its merely 4.8″ length makes things easier at tighter spots.

This machine delivers a max torque of 250 ft-lbs. It works to remove highly stubborn bolts and fasteners on breakaway torque.

Drive control constitutes 4 modes. These modes deliver unmatched control in different usages. Precision control is enhanced by 1-3 RPM. Its automatic shut-off system at 4th mode helps to avoid over fastening.
Over 2500 customers rated 4.8/5 globally.

Battery life: 4.7/5
Value for money: 4.7/5
Lightweight: 4.8/5

Dewalt 20V Max XR 1/2″ DCF899B

Dewalt DCF899B Max is an excellent choice for a powerful and versatile performance in different applications for fastening purposes. The product is designed for speed control, functioning in dark places, and acute comfort.

• Dewalt XR performs at 700 ft-lbs. maximum torque and maximum breakaway torque of 1200 ft-lbs.
• It weighs 7.2 lbs. The length of the compact design is 8-13/16″.
• Multi-speed controls for various applications.
• Available for both detent pin and hog ring.
• 20-second delay LED light for enhancing visibility.

This impact wrench is rated 4.8/5 by over 3000 customers globally.

Battery Life: 4.7/5
Longevity: 5/5
Lightweight: 4/5
Value for money: 4.6


In a nutshell, it’s a tricky question in a comparison of 3/8 vs 1/2 Impact Wrench. 1/2 impact wrench is ideal for heavier applications and 3/8 for smaller ones.

If you’ve read the complete guide, you have already understood the difference between them and which will better suit your work.

If you ask me which one to go for, I will recommend a 1/2 impact wrench. Its balanced design for most applications renders it the best hit for us. And it’s also the most used one A 3/8 impact wrench is perfect for smaller projects

Frequently Asked Questions

Should I get a 3/8 or 1/2 impact wrench to tighten lug nuts?

Choosing a 1/2 or 3/8 impact wrench is a tough decision. Anyhow, the process can be effortless if you already know what are the requirements and features you want. You already know which is better. Consider the use and choose what suits you best these impact wrenches can help you in tightening lug nuts.

Can an impact driver be used as an impact wrench?

Yes, you can use an impact driver instead of an impact wrench to tighten or loosen nuts and bolts. The main difference is in their torque power output. The average torque output of impact drivers is 110 ft-lbs. While a typical impact wrench comes in 700 ft-lbs. torque output. It depends on the applications. However, you can use both.

Bahram Shahab
Bahram here! A certified Electrical Engineer who knows his way around using power tools like a professional. My journey of using these robust tools started back when I graduated. Since then, I have finished almost a dozen DIY woodworking jobs. Apart from that, I have developed this habit of jotting down my personal experience about using a specific tool. So, I write on them to help the community in the best possible way.