10 Best Pneumatic Die Grinders – (Reviews & Guide 2020)


If you have ever worked with metal or reinforcement material in general, you can certainly benefit from a grinding head. A grinder is by far the most versatile tool that can be used in any workshop. Learn how to get the air grinder that best fits your needs and goals – that’s what we’re going to do today.

We will talk about the quality of these pneumatic tools and the performance you can count on. We will also talk about grinder parts, mechanics, and their differences. There are many options and different types of air grinders. In order to get the right tool, we recommend that you study our manual and overviews and then make a decision. In the end, you will use this tool very often, regardless of the project or material you are working on.

Quick Look at Top Quality Pneumatic Die Grinder

#1 in Comfort and Ergonomics
61lJ6pgNWTL. AC SS350

Powerful motor with fixed 25,000 RPM No Load Speed Easy-to-handle at only 3.7 lbs. Protective zig-zag varnish seals the armature from dust and debris for longer tool life

Amazon's Choice for "Electric Die Grinder"
51WEmLiPeaL. AC SX679

4.2 Amp, 25,000 rpm motor provides high power and speed for all 1-1/2" grinding applications AC/DC capacity works off welding machines and generators Paddle switch with lock-on button for easy gripping

#1 Choice - For "Astro Grinder"
81WqDQiCgyL. AC SY741

Composite handle reduces vibration, Rib textured handle provides a firm grip, Lever throttle for feathering control

Heavy Duty Air Die Grinder
615j7SvYIvL. AC SX679

  • Rugged, energy-efficient 1/2 hp motor
  • Built-in regulator matches speed to job
  • Rear exhaust directs air away from work

#1 - Choice for "Die Grinder Set"
71o9BWmlROL. AC SX522

  • Long-life ball bearing construction
  • Self-locking lever throttle
  • Rear exhaust

Most Comfortable Trigger in the Industry
71d0VT9ZJ%2BL. AC SX522

  • Great tool to get in the tight spots
  • Angle gear mechanism
  • Patented quiet technology (85 decibels)

Best Pneumatic Die Grinder Reviews (Updated List)

1. Ingersoll Rand 301B Air Angle Die Grinder

Ingersoll Rand 301B Air Angle Die Grinder

Ingersoll Rand 301B is an air operated angle grinder. Ingersoll Rand 301B Air Angle Die Grinder has been in use for a long time and their angle grinder is popular with both amateur and professional grinder users. This is due to the compact design and the total weight of this machine which just over a pound. This model now shows us that despite its lightness it can be a powerful instrument, even one of the most powerful in its field.

The body is made of ergonomically shaped cast aluminum, i.e. without rubber parts. The position of the drill string is set at 90 degrees, allowing better maneuverability and facilitating access to hard-to-reach areas. But with a powerful implementation, there is a great need for CFM. This special air grinder requires an average of 6 CFM and 24 CFM at full load, so no light air compressor can fully support it.

2. Chicago Pneumatic CP875 1/4-Inch 90 Degree Angled Air Die Grinder

Chicago Pneumatic CP875 Angled Air Die Grinder

This is a well known CP angle grinder. It is a pneumatic tool that can do everything from simple paint stripping to chip and metal cutting. The case is made of strong, lightweight aluminum and weighs a total of one pound, which is excellent for use.

The angle of the cutter is perpendicular to the rest of the tool, which is especially appreciated for filigree work, not only on metal but also on wooden materials. This air grinder comes with a pair of keys to help you change burrs and has a built-in lock to prevent unintentional starting, increasing the safety of the model.

A watch with a ¼-inch collar size that fits most standard extensions and burrs. The CP875 is a great addition to your instrumental arsenal, and it surprises us with its power.

3. DEWALT DWMT70783 Straight Die Grinder

DEWALT DWMT70783 Straight Die Grinder

Dewalt is a well-known giant in the tool industry and its straight grinding heads have a lot to offer. It is slightly heavier than the shredders in its class and has a recognizable black-and-yellow color. The housing is made of aluminum, which reduces the total weight of this pneumatic tool to just 2 pounds.

The chimney is located at the back, so there is no need to spray dust. This special model of pneumatic sharpener is designed for two types of collets, 1/4 inch, and 1/8 inch.  To make it even more comfortable, it has a touch-sensitive trigger control with adjustable speed. There is a throttle safety lever under the tractor that locks the pneumatic tool when you release it. In general, it is a powerful and safe tool for its price.

4. Ingersoll Rand 1/4″ Air Die Grinder 3107G

Ingersoll Rand 1/4″ Air Die Grinder 3107G

Ingersoll Rand is dedicated to making versatile tools, and this machine model is one of the most compacts in the world. But that doesn’t mean he lacks strength. The housing is made of aluminum and around the ergonomic handle is a thick layer of rubber that prevents unnecessary vibration and generally makes the handle easier to grip.

The burr angle of this air grinder is 0 degrees, which means you can use it as a saw, with the right extension to be precise. The hook is activated by pressing on the side and there is a safety lock under the hook so that you can lock it when you are not using it.

An extension ¼ can be inserted in the clamp of this model. The excess pressure of the exhaust air is discharged through the back to prevent sudden dust clouds.

5. Astro 218 1/8-Inch Pencil Type Die Grinder

Astro 218 1/8-Inch Pencil Type Die Grinder


This Astro pneumatic pencil sharpener is no ordinary sharpener. It is designed for very inaccessible places. Due to its incredible design and light material, this pneumatic tool could only weigh 16 ounces, which is far below average, even for this type of machine.

The special feature of this air grinder is that it can easily process 56,000 revolutions per minute, regardless of size. The collet groove is 1/6 inch in diameter, so any standard extension of this range is sufficient.

In addition, the implement is equipped with a throttle lever, which makes it possible to shift directly from one gear to the other and thus adapt to the task at hand. This lever shredder is ideal for people working in engine maintenance or heavy mechanical work. It can achieve better results than a standard shredder, but it can contain a larger punch size.

6. Ingersoll Rand 3101G Edge Series Air Angle Die Grinder

Ingersoll Rand 3101G Edge Series Air Angle Die Grinder


Ingersoll Rand has made tools for every level of experience and skill you have. With this pneumatic angle grinder, Ingersoll Rand attracts more people who appreciate safety and stability. The aluminium housing makes the model ultra-light and the extra ergonomic anti-vibration handle is covered with a rubber layer that further increases the grip balance.

The milling cutter is perpendicular to the machine, which is perfect for working in corners and in certain hard-to-reach places. This angle grinder can be mounted on the collet of any type of drill extension cable ¼, and we have found it very useful for all types of polishing work. The shape and strength of this device makes it easy to apply pressure.

However, this air grinder can also handle some difficult tasks. The steering unit is adjustable and has a safety cap on the underside so that it does not trip if it is not held in place.

7. Chicago Pneumatic CP860 Heavy Duty Air Die Grinder

Chicago Pneumatic CP860 Heavy Duty Air Die Grinder


Here we have a popular CP pneumatic grinder for machine operators and professional engineers. It has an industrial design with a metal surface, and the bodywork is made entirely of aluminum, making it both heavy and light. The total weight of the tool is 1.26 pounds.

Unlike the pneumatic shredders in its class, this model has a square handle, which makes it extremely reliable. The shutter release button is set according to the task and there is a throttle opening underneath the shutter release button. The pneumatic grinder is ideal for cutting heavy metals because a circular saw can be installed instead of the standard drill.

The gas outlet is located at the rear, so you don’t have to worry about dust emissions or flying sparks when working with metal.

8. Astro 219 ONYX Die Grinder Kit

Astro 219 ONYX Die Grinder Kit
Astro 219 ONYX Die Grinder Kit

This two-component pneumatic die set has found its way into our list thanks to a wide range of applications. Astro has opted for a modern design with a palette of black and red colors. The set consists of a 0-degree air grinder and a 90-degree air grinder, which covers everything this tool needs. The 0-degree tool allows you to cut, saw, and deburr, while the 90-degree tool helps you to cover certain bottlenecks with high-quality varnish.

Each grinder weighs just under two pounds and has a composite handle that makes the grip much stronger. In addition, the manufacturer has installed 8 different milling extensions to help you achieve maximum precision. Both units have an exhaust pipe at the rear and the power is regulated by a side hook. In addition, both grinders are equipped with a safety gas under the tractor that switches off the tool when the pressure is removed.

9. Chicago Pneumatic CP872 Air Die Grinder

Chicago Pneumatic CP872 Air Die Grinder

One of the toughest models of Chicago Pneumatics with a sturdy red-lacquered aluminum body. The design of the body makes this pneumatic tool strong in the hand, and it has proven to be quite stable when started. The starter hook is fitted as standard on the side under which a throttle brake is fitted which shuts off the air sander when the pressure is removed from the handle.

This special model of the grinding head is ideal for high-speed polishing and grinding, while the manufacturer also offers to score and cleaning for its other strong combinations. The tractor is equipped with cruise control that reacts to the pressure of the palm of the hand and the exhaust is located at the rear to prevent emissions. The pneumatic tool can be used with a medium-sized compressor without having to recharge it several times during operation.

10. Astro 1221 Die Grinder Kit with Rotary Burr Set

Astro 1221 Die Grinder Kit with Rotary Burr Set

Astro has developed this set to meet all requirements that a master or machine operator operating a pneumatic mill may have. With such a set you can cover everything from cutting to cleaning and polishing. It includes a pair of pneumatic grinders, one with a 0-degree angle and the other with a 90-degree angle for burrs and drill extensions. Apart from the difference in angle, the two pneumatic tools are almost identical.

The handles are made of composite material for a better grip, and the tractor is integrated on the side of both devices as standard. Reduce security in the form of a broken throttle valve. There are vents at the rear to prevent air from being blown out, and both units weigh about a pound.

In addition, Astro has supplied an 8-component rotary cutter with these two grinders. The kit covers everything you need and helps you solve common problems.

What is a Pneumatic Grinder?

Best brands for pneumatic grinders

Simply calling these tool grinding heads does not do them justice. The best way to describe them would be to say that pneumatic grinding heads are indeed multifunction pneumatic turning tools. Now we know it sounds about the same, but it’s all in the title. The pneumatic part refers to the fact that a source of compressed air is required to operate this tool. And what’s better than an air compressor

Why do engineers think this is not a tool that only punches and grinds metal parts? The multifunctional part of the description should answer this question. Air grinders have so many functions and purposes thanks to the many extensions and attachments you can attach (or insert, depending on who you ask). As a result, these tools can grind, cut, polish, clean and grind much more than a simple mould.

With the growing number of do-it-yourself workshops and the trend towards artisan production in garages, the demand for well-designed air grinders is starting to increase lately. And the use of crushing machines is not limited to engineers and operators working under difficult conditions. Artists, especially sculptors, have recognized the precision and quality that a pneumatic grinder can bring to the shaping of metal, minerals and even plastics.

To answer the question: What is a pneumatic grinder? The safest thing to say is that it is as versatile and comfortable as you can imagine. Many experienced craftsmen around the world are still discovering new applications for this tool, even though it has been around for centuries.

How Does a Pneumatic Grinder Work?

As with any pneumatic tool, the entire working sequence of the grinding head starts in a pneumatic compressor. The compressor generates a high-pressure air stream, which is fed through a rubber hose to the grinder. As soon as the pressure reaches the inlet opening of the mill, it enters the small rotating chamber. In this chamber, all pressure energy is converted into rotational energy, which then passes into the collet.

If all this sounds too complicated, don’t forget that the drills used by dentists are considered grinders, even though they are incredibly delicate. The collet holder is actually an empty slot that takes an extension of the milling cutter (we’ll come back to this later) and turns it very, very fast! This is a speed of up to 50,000 revolutions per minute or momentary. It is necessary to turn at this height for a grinder to cut, grind and trim metal and other materials.

All excess air is sucked in through an intake opening, which is usually located somewhere in the back of the mill. Due to the high speed and strong movement of the compressed air, the grinding heads sometimes tend to heat up in continuous operation. So it’s important to take a break and wait until she’s calmed down a bit.

Pneumatic Grinder Buying Guide

Best Air Grinders

These impressive machines have a wide range of functions and tasks in various industries and workshops. From heavy technique to art. They look like versions of drills and dental instruments. Once you know this, it’s time to go into detail and see what features you can expect and how best to use these tools. Let’s grind!

1. Collet angle

The very first thing you’re asked when you say you have an air mill is definitely something about coal. In fact, pneumatic grinders can be divided into two main angle groups:

  • Angle grinders with a 90 degree wheel – designed to help you reach hard-to-reach places and corners, especially on steel structures. Angle grinders with a 90 degree grinding head are mainly used by welders and metalworkers. However, they are very useful in combination with circular polishing extensions.
  • 0 degree or linear grinders – in these models, the collet holder is positioned linearly directly behind the rotary chamber. Linear grinders can be mounted on small saws and are ideal for cutting hard metals. Unlike the 90-degree type, it is much easier to check, especially on smaller models, which brings us to the next topic.

2. Size of air grinders; how does this affect productivity?

Although this method is intuitive, it is more logical that it is less applicable to pneumatic forging mills. The vast majority of popular models offered are quite similar in size, which is why we call it a normal size. They offer an average speed of about 10 to 20 miles. The normal model fits in the palm of the hand and weighs no more than 3 pounds on average.

But there’s one thing that’s usually called a pencil – a grinder. As their name indicates, they are much smaller and are linear (0 degrees). It is reasonable to assume that pneumatic hand grip grinders produce fewer and fewer revolutions, but the average productivity of hand grip grinders can be as high as 50-60 thousand revolutions per minute. Yeah, you read it right. 50,000 revolutions per minute. However, it is important to note that these models are somewhat expensive due to the complex precision required to produce them.

3. Burrs and Extensions

That’s where it gets interesting. Do you remember the plurality we talked about? It’s all in the punch extensions. Check the collet diameter to ensure that the extension or burr can be adapted to your existing grinder. The standard is 0.125 or 0.25 inches.

The most commonly used strawberry extensions are normally sold in eight sets. Some manufacturers include them in the standard packaging along with the tool itself, but frankly most do not. That means you have to invest a little more money in a strawberry game. In these standard assemblies usually metal mills and mills with different angles and diameters are found. This should help you, especially if you’re a beginner.

But grinders usually shine with something else, and that’s polishing! Imagine such an ultra-high rotation in combination with a thin polishing cloth. Sanders with a 90 degree angle are particularly suitable for polishing because more pressure can be applied to the back of the machine, which speeds up the process and improves the quality of the gloss.

Another excellent application of high speed is grinding. There is a wide range of grinding extensions, discs and burrs that can be inserted into the collet. The fine grinding of complex angles can only be achieved with a pneumatic grinding machine. Conventional grinding machines are usually too heavy and inaccurate, but they can easily be made with a small, complex pneumatic tool.

With the right milling cutter extension, which is very small and precisely ground, you can turn your pneumatic grinding head into an engraving tool. The handy little grinders we were talking about are very popular with jewellers all over the world.

You could talk for hours about the usefulness of this tool, but the essence here is: from complicated polishing and engraving jewellery to cutting metal and polishing with a pad – everything is right! If you don’t know where to start, take the standard 8-component installation and mount from there. These extensions and ribs are affordable and not so easy to break.

4. Personal Protective Equipment – your best friend’s workplace!

Personal protective equipment

Inexperienced people tend to underestimate the effects of an air grinder, usually because of its size. Don’t be fooled. These machines are just as powerful, if not more powerful, than nail guns and air hammers. They’re even more dangerous because of the high speed. You cannot afford to hurt yourself or the environment, so always remember the safety tips for air tools and wear protective clothing. Among other things:

  1. Skin protection – Because you will be cutting and working a lot of metal, it is best to always wear a fire retardant suit. Gloves are also mandatory because of the heat released by the total air pressure and the ratio between the grinder and the surface you are working with. There may be sparks, so it’s best to cover your face and neck.
  2. Respiratory mask or paper mask – If you work with metal that tends to break down into microscopic particles, protection of the mouth and nose is essential. Metal microparticles are easy to inhale and can cause many problems.
  3. Eye protection is for the same reason as skin and respiratory protection. You have to protect your eyes from all flying particles. Standard safety goggles will do.
  4. Hearing protection is an often overlooked safety feature. Air compressors are noisy in themselves and air mills are not very different from each other. Use earplugs or noise-cancelling earphones to reduce the strain on your ears.

Best Air Die Grinder Comparison Chart

PRODUCT SIZE WEIGHT WARRANTY
(INCHES) (YEARS)
Ingersoll Rand 301B Air Angle Die Grinder 5.3 x 1.3 x 2.9 1.02 lbs 1
Chicago Pneumatic CP875 1/4-Inch 90 Degree Angled Air Die Grinder 4.2 x 7.5 x 2.6 1.1 lbs 1
DEWALT DWMT70783 Straight Die Grinder 7 x 3.2 x 2.3 2 lbs 3
Ingersoll Rand 1/4″ Air Die Grinder 3107G 9.5 x 6.25 x 1.75 1 lbs 1
Astro 218 1/8-Inch Pencil Type Die Grinder 5.2 x 14.5 x 19.7 1 lbs 1
Ingersoll Rand 3101G Edge Series Air Angle Die Grinder 9.5 x 6 x 2 2 lbs 1
Chicago Pneumatic CP860 Heavy Duty Air Die Grinder 4 x 3 x 8 1.26 lbs 2
Astro 219 ONYX Die Grinder Kit 12.5 x 8.25 x 1.75 3.6 lbs 1
Chicago Pneumatic CP872 Air Die Grinder 9.3 x 4.4 x 3.8 1.26 lbs 1
Astro 1221 Die Grinder Kit with Rotary Burr Set 12 x 7 x 2 1.6 lbs 1

Completion

And that’s the end! In this manual you will find all the information you need to find the best pneumatic forging crusher for your needs. Yes, you should take the time to study the guide and the comments we have prepared for you, but there is something else. Given the enormous usefulness of these tools, it is a good idea to think about the tasks and the work you are going to do. Don’t try to get it all at once, because that would be a dead end. Take your time and assess your needs and wishes.

We sincerely hope that we can shed some light on this difficult subject. Air grinders are a tool every workshop should have, so why not take the time to familiarize yourself with them? If you have something to add or ask, you can do so in the Responses section below. Let’s grind!