Milwaukee M18 FUEL™ 1/2" Impact Wrench

Buying Guide: How To Choose A Cordless Impact Wrench

An over-tightened or rusted nut or stuck bolt can make you realize you must add a new tool to your kit. One of the best models for the job is a cordless impact wrench. This helpful tool has more torque than most drills. It can remove a stuck nut or bolt in minutes. This saves you time and frustration. Please learn more about this handy tool in our cordless impact wrench buying guide.

How A Cordless Impact Wrench Works

Inside the tool is a rotating mass. A cordless impact wrench uses batteries to generate power. The motor builds up energy using rotation and then pushes it into an anvil at the end of the tool. This creates an enormous amount of torque, more than can be produced by any human. The mass is shaped like a hammer in the best cordless impact wrenches. It keeps rotating, so the operator only feels some impact.

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Cordless impact wrenches generate much torque. They are exact, so they are ideal for many jobs. Using this power tool when working on a construction site or securing lug nuts on a wheel is much safer than doing it by hand. All impact wrenches work similarly. But, if you compare cordless impact wrenches, you’ll notice many differences.

Cordless Impact Wrenches Versus Other Tools

As you plan to buy a cordless impact wrench, knowing it makes lots of torque is essential. But, it is usually less than comparable tools that use compressed air. Because of this, a cordless impact wrench is an excellent option for smaller jobs. It is ideal for a home workshop where space is at a premium. A cordless impact wrench uses rechargeable batteries. It can be heavier than the corded variety. But, it offers much greater mobility. This is especially true in tight or remote areas.

What To Look For In A Cordless Impact Wrench

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When choosing your new cordless impact wrench, it would be best to consider things. The first thing to decide is the brand. If you have other cordless tools, choose a cordless impact wrench that uses the same battery pack and charger. It is a clever idea. Spending a little time doing a cordless impact wrench comparison is also a clever idea. Some high-end models offer extra features. For example, they have adjustable torque settings. This eliminates the need for a manual torque wrench.

Shapes And Socket Size

Cordless impact wrenches come in two body styles. They are inline and pistol grip. The inline style of impact wrench looks like a large screwdriver. It has a grip behind the hammer and anvil. The pistol style is shaped like a handgun, and the grip rests underneath the motor. Cordless impact wrenches also have a range of socket sizes. These sizes are designed to fit nuts and bolts of varied sizes. The table below shows the socket sizes for each impact wrench shape. Use inline wrenches for tight spaces. If you plan to work on machinery, you must have an inline impact wrench.

Pistol impact wrenches are bulkier. But their grip is more ergonomic. It prevents strain on your hands and lets you work for a long time without fatigue. Some models have side handles. They allow you to use your weight for more leverage. They also help you keep a proper working angle. Suppose you do not need the excellent fit of an inline wrench. A pistol-style impact wrench is usually the best choice.

Socket Size

Impact Wrench Shape

1/4-inchBoth inline and pistol
3/8-inchMostly pistol, but also works with a specialized inline style known as a butterfly wrench
1/2-inchPistol
3/4-inchPistol
1-inchPistol and a T-shaped inline featuring handles opposite the anvil

Larger socket sizes are also available, up to two inches. However, large bolts are usually found in big jobs. These need heavy-duty impact wrenches with more power than a cordless wrench.

Comfort

Jobs that need impact wrenches require using them for many tasks. They must be used for a long time. Ergonomic handle grips and anti-vibration measures help reduce strain. Also, pick a cordless impact wrench with only the power needed for the job.

  • A smaller motor tends to mean fewer vibrations, lessening the physical strain.

Durability

Look for design enhancements.

For example, all-metal gear housing or high-strength plastic over molds. They help prevent damage from impacts or being dropped. Impact wrenches have brushless motors with fewer moving parts. So, their parts are less likely to break down, and maintenance is more straightforward.

Torque

No matter the style or socket size, its torque is a critical feature to consider. When performing a cordless impact wrench comparison, look at the maximum torque each one can create. Many top cordless impact wrenches have multiple torque settings. This makes them much more versatile than ones with only one setting. Setting the torque down only to what is needed lets your battery work longer and prevents overtightening.

Compared to many other power tools, cordless impact wrenches are quite specialized in what they do. Large nuts and bolts may not need to be removed or tightened as often as smaller screws. But when you need to adjust one, a cordless impact wrench will save you time and energy. They can also loosen and tighten nuts and bolts more precisely than hand tools, such as sockets and ratchets. This is crucial when working with larger bolts or machinery.

6 Comments

  • The Wrencher

    March 15, 2017 at 12:16 pm

    Mostly I like the part Socket Size and Impact Wrench Shape. Great Job you did in this blog. Well all information is very nice and useful.

    Reply
  • John Stewart

    June 19, 2019 at 9:59 am

    Hey,
    I have been reading a lot of posts on factors to consider when buying a cordless impact wrench and this is by far the best of them all.
    Thanks for sharing

    Reply
    • Acme Tools

      June 29, 2020 at 8:25 am

      Hi Ed, Thank you for your question. The tools have different uses and you must decide which is best for your needs. A 3/8″ impact is better for smaller low torque applications and it is typically lighter weight. A 1/2″ impact is typically for larger applications, has more torque, and is heavier. It all depends on your needs.

      Thank you, Acme Tools

      Reply
  • Paula

    May 12, 2022 at 7:32 am

    How do I know what size or torque I need to change the blades on my lawn mower? I want to buy one to do this can anyone give me some help? I have an air compressor or I have a battery power too. What is the most cost effective? I don’t forsee a lot more I will use it for but a nut or bolt here or there and regular changing of blades on mower. Thank you.

    Reply
    • Acme Tools

      May 12, 2022 at 9:45 am

      Hi Paula. Generally speaking walk behind mower blades should be tightened to 40-50 ft lb and riding mower blades should be tightened to 70-90 ft lb. If you have your owners manual for the mower it should be stated there for your specific unit. Once you have that information you can make an educated decision on what type of impact wrench is best for your situation.

      Thank you,
      Acme Tools

      Reply

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