6 Best Air Die Grinders of 2021

Last update: 2021-11-27

An Air Die Grinder, or also known as Pneumatic Die Grinder, is a small, one-handed power compressed air tool that has a rotating spindle and a collet that holds the die grinder bits with high-speed rotation. The Air Die Grinders are the best option for smoothing the rough surfaces of a workpiece. When connected with the right bit, Air die grinders can do many different tasks, mainly used for polishing, sharpening, cutting, or grinding various materials, even with sensitive materials like plastic, wood, crystal, …

Moreover, Air die grinders are popular with families, factories, and workshops, so they tend to be inexpensive. So, if you are on a budget and wanna own an air compressor, here are your recommendations – The best Air Die Grinder!

Here are the best air die grinders you can buy in 2021:

  • Best Overall: Ingersoll Rand 301B Air Angle Die Grinder
  • Runner-up: Chicago Pneumatic CP860 Die Grinder
  • Best Value: Ingersoll Rand 3107G Air Die Grinder
  • Premium Choice: Astro Pneumatic Tool 219 ONYX 3pc Die Grinder Kit
  • Best for Home Use: PROSHI 1/4-Inch Angle Air Die Grinder
  • Most Powerful: Chicago Pneumatic CP876 Die Grinder
6 Best Air Die Grinders
Best Overall
Ingersoll Rand 301B Air Angle Die Grinder
  • Safety-lock throttle lever
  • Small and Lightweight design
Runner-up
Chicago Pneumatic CP860 Die Grinder
  • Built-in regulator matches speed to the job
  • Productivity and control tool speed
Best Value
Ingersoll Rand 3107G Air Die Grinder
  • Strong and power ball-bearing
  • Ergonomic grip easy for torque accuracy
Premium Choice
Astro Pneumatic Tool 219 ONYX 3pc Die Grinder Kit
  • Multiple choice for bits
  • Rear exhaust
Best for Home Use
PROSHI 1/4-Inch Angle Air Die Grinder
  • Flexible with the 90-degree head
  • Full set of accessories
Most Powerful
Chicago Pneumatic CP876 Die Grinder
  • Lightweight
  • Easy to handle

Best Overall: Ingersoll Rand 301B Air Angle Die Grinder

Ingersoll Rand 301B Air Angle Die Grinder
Ingersoll Rand 301B Air Angle Die Grinder
Pros
  • Strong Aluminum housing
  • Safety-lock throttle lever
  • High speed
  • Small and Lightweight design
  • Easy to access small spots
Cons
  • The exhaust is forward-facing
  • Maybe its size is too small for the big hand

301B Air Angle Die Grinder is one of the best-in-class quality products of Ingersoll Rand company. And of course, 301B doesn’t let buyers down with their power.

According to the purpose of Ingersoll Rand company “long-lasting, economical, general purpose grinders”, the 301B delivers many beneficial features in one product. The right-angle configuration provides easy access to tight spots, so you can grind, break sharp edges, de-burr, port, and polish virtually anywhere! 301B is also perfect for large polishing projects, don’t worry if you work in the big workshop or garages.

Moreover, with its strong aluminum covering outside, 301B can withstand tough operating conditions, and its durable ball-bearing construction improves balance, reduces vibration, and ensures a longer life. The small, lightweight design provides easy operation, and greater access to tight spots, while an integral safety-lock throttle lever prevents accidental start-up. It also features a front exhaust to help you keep work surfaces clean.

Beneath the housing of 301B, it has a very strong 0.25 HP motor that delivers a free speed of 21,000 RPM. Powerful machined steel gears give it the durability and the precision that your tasks demand.

Ingersoll Rand 301B Air Angle Die Grinder Specifications
Verdict

Lightweight but versatile.

Runner-up: Chicago Pneumatic CP860 Die Grinder

Chicago Pneumatic CP860 Die Grinder
Chicago Pneumatic CP860 Die Grinder
Pros
  • Productivity and control tool speed
  • Excellent for heavy duties
  • Lock-off throttle lever
  • Built-in regulator matches speed to the job
Cons
  • Get hot when using for a long time
  • The exhaust placement is odd

CP860 Heavy Duty Air Die Grinder is extremely air-efficient in the range of Air Die Ginder market.

With general maintenance application die grinder, productivity, and control. Excellent for cleaning tires, moldings, porting, relieving engines, and general high-speed polishing and grinding. Built-in regulator matches the speed to the job.

The rugged, energy-efficient 0.54 HP motor delivers a free speed of 24,000 RPM. This die grinder features a rear exhaust to direct air away from work, an adjustable power regulator for precise control. CP860 also equips with a lock-off throttle to prevent accidental startups and a square handle design for greater comfort. It measures 5-3/4 inches long and comes complete with a 1/4-inch and 6-millimeter collet.

The Chicago Pneumatic CP860 Die Grinder offers excellent material removal rates combined with heavy-duty, all-metal housing for maximum durability. While initially launched as a "maintenance duty" or "vehicle service" type tool, the CP860 has also proved to be a reliable performer in harsh environments such as casting plants and shipyards.

Chicago Pneumatic CP860 Die Grinder Specifications
Verdict

If you want to find an extremely powerful Air Die Grinder for doing the heavy job, CP860 is the best tool for you.

Best Value: Ingersoll Rand 3107G Air Die Grinder

Ingersoll Rand 3107G Air Die Grinder
Ingersoll Rand 3107G Air Die Grinder
Pros
  • Strong and power ball-bearing
  • Lightweight
  • Ergonomic grip easy for torque accuracy
  • Self-locking throttle
  • Bang for the buck
Cons
  • Get hot when using for a long time
  • The exhaust placement is odd

Our best value Air Die Grinder belongs to Ingersoll Rand company - the model 3107G. Cut, grind, polish, or tackle other tough jobs with the Ingersoll Rand 3107G heavy-duty air die grinder is a good choice.

Part of the Ingersoll Rand's Edge series, this handheld power tool sports a ball-bearing construction that's sturdy yet lightweight. Features include a 1/3-horsepower motor, a 1/4-inch collet, a rear exhaust, and a self-locking throttle.

The 3107G features an “Award-winning ergonomic design” that delivers exceptional torque accuracy and is comfortable to hold or use. Increasing productivity and safety for the owner. The tool's contoured grip offers greater comfort while you're working. This product measures 6.6 inches long and weighs 1.75 pounds.

Ingersoll Rand 3107G Air Die Grinder Specifications
Verdict

Suitable for heavy duties and long-lasting

Premium Choice: Astro Pneumatic Tool 219 ONYX 3pc Die Grinder Kit

Astro Pneumatic Tool 219 ONYX 3pc Die Grinder Kit
Astro Pneumatic Tool 219 ONYX 3pc Die Grinder Kit
Pros
  • Good Quality
  • Multiple choice for bits
  • Compact and lightweight
  • Rear exhaust
Cons
  • Expensive

Standing in The Premium Choice, we can’t miss Astro Pneumatic's 219 ONYX 3pc Die Grinder Kit includes the 1/4-Inch 90-Degree Angle Die Grinder, 1/4-Inch Mini Die Grinder, and an 8pc.

Double Cut Carbide Rotary Burr Set. Features of this set include a lever throttle for feathering control, a rib textured handle that provides a firm grip, and a rear exhaust airflow system that directs air away from the work surface. That gives you twice the flexibility and a sturdy little set that does not vibrate as much, is silent, and allows you to control the throttle at the touch of a finger.

Additionally, the increased motor size provides more power to make completion of work that much easier. Astro Pneumatic Tool 219 ONYX 3pc Die Grinder Kit w/ 90° Die Grinder, Die Grinder & 8pc Double Cut Carbide Rotary Burr Set will include:

  • SA-5: Cylindrical shape 1/2" X 1"
  • SA-3: Cylindrical shape 3/8" X 3/4"
  • SC-3: Cylindrical radius end 3/8" X 3/4"
  • SC-1: Cylindrical radius end 1/4" X 5/8"
  • SD-1: Ball shape 1/4"
  • SD-3: Ball shape 3/8"
  • SF-3: Tree-shaped radius end 3/8" X 3/4"
  • SF-5: Tree-shaped radius end 1/2" X 1"
Astro Pneumatic Tool 219 ONYX 3pc Die Grinder Kit Specifications
Verdict

Well worth the money

Best for Home Use: PROSHI 1/4-Inch Angle Air Die Grinder

PROSHI 1/4-Inch Angle Air Die Grinder
PROSHI 1/4-Inch Angle Air Die Grinder
Pros
  • Flexible with the 90-degree head
  • Lightweight aluminum body
  • Can control the tool speed
  • Full set of accessories
Cons
  • Take time to catch up with the compressor

Last but not the least, PROSHI 1/4-Inch Angle Air Die Grinder will be our bright candidate in the best for home use. With the reasonable price, convenience to use, PROSHI brings the best quality tools in the range of budget price.

More than that, the 1/4-inches angle air die grinder shows us many impressive features: The 90-degree head allows flexibility in many applications, for reaching tight or angled grinding, easy to access to small spots. Variable-speed throttle ramps up to maximum RPM, built-in air regulator for precise speed control.

Besides, PROSHI 1/4-Inch Angle Air Die Grinder has s lightweight aluminum body, rear exhaust to keep the clear area, durable ball-bearing motor. Suitable for precision machining, smoothing, chamfering, deburring, grinding, polishing, engraving, and various jobs. Stepless speed control knob switch: according to different purposes, choose different speeds to meet different needs. Industrial grade 1/4" collet: high concentricity, small yaw, low vibration, high wear resistance, no heat, stable operation.

PROSHI 1/4-Inch Angle Air Die Grinder Specifications
Verdict

PROSHI 1/4-Inch Angle Air Die Grinder considers the same quality as a popular brand with the budget price.

Most Powerful: Chicago Pneumatic CP876 Die Grinder

Chicago Pneumatic CP876 Die Grinder
Chicago Pneumatic CP876 Die Grinder
Pros
  • Lightweight
  • Compact design
  • Easy to handle
Cons
  • Suitable for small works

CP876 Mini Die Grinder is a perfect tool for tight spaces but under heavy industrial use. Moreover, with the impressive high free speed of 30.000, CP876 can satisfy the tool power.

General maintenance applications, Compact and lightweight tool designed for easy maneuverability, Ideal for limited space applications. Lightweight design for easy maneuverability. Excellent for high-speed blending, smoothing, porting, and deburring in confined areas.

Chicago Pneumatic CP876 Die Grinder Specifications
Verdict

Small but packed with a punch.

FAQs

1. What are air die grinders for?

You can polish, sand, cut, grind, or hone various materials with an air die grinder and the appropriate accessory.

A die grinder or air die grinder is a tiny, handheld power tool with a spinning spindle on which the cutting bit is held by a collet. The material is removed from the workpiece using a grinding tool that rotates at a very high speed. They have a rotating tool-like appearance and are often driven by compressed air or electricity.

Die grinders can perform a wide range of jobs when equipped with the appropriate equipment. Metal is the primary material that die grinders are designed to operate with. However, they can also be used on more delicate materials like plastic and wood. Here are some benefits of air die grinders:

  • Reworking Dies: The die grinders used in tooling such as metal stamping dies, plastic molds, die-casting dies, forging dies, and so on. Die grinders are now used by toolmakers for deburring, chamfering, polishing, grinding, and matching the welded surface, among other things.
  • Polishing Metal: Any metal object looks nicer once it has been polished thoroughly. We can polish even large surfaces is simple with a die grinder. The spherical cross-section of the rotary polishing bits makes them ideal for polishing holes and curved surfaces.
  • Smoothing Out Surfaces: A die grinder can be used to smooth down a wide range of materials with the right attachment. It can be used to smooth metal, hardened steel, wood, and other materials.

2. How does a pneumatic die grinder work?

An air angle die grinder is powered by an external air compressor. The air compressor's pipe is connected to the air inlet connector on the grinder. The air compressor is turned on, and the grinder's control lever is steadily squeezed.

The compressor's compressed air forces rotate the collets' mechanism. As a result, spinning collets with a grinding attachment are produced. A control lever, a long handle shaft with an air entrance at the end, and a 90-degree collets assembly make up an air angle die grinder. Collets can be used to attach various grinding accessories, such as sanding discs, to the machine.

For woodwork, generally accurate cutting or grinding tools and a steady hand are required. Air angle die grinder is a flexible method to grind brick and wood. The operation of this die grinder is fairly straightforward. A common air angle die grinder uses more than 90 pounds per square inch (PSI) for basic operation. This value should be given special consideration; the compressor should be set at this value to prevent damage to the attached grinder.

3. Are die grinders dangerous?

Yes, somehow users should always wear personal protective equipment. Some of the dust produced by sanding, grinding, drilling, and other building activities contain chemicals that have been linked to cancer, birth defects, and other reproductive problems.

Before using the product, users should read all instructions thoroughly. Always remember to follow regional safety regulations.

4. What's the difference between an air die grinder and an angle grinder?

The differences between an angle grinder and an air die grinder are mainly from the design of the tool, its size, and its power. A die grinder is a rotary tool used for precise operations, whereas the angle grinder is usually used for cutting and rough grinding.

  • The die grinder: A die grinder is a rotary tool that is used to cut cylindrical bits. A die grinder is a tiny, handheld instrument that can be used for a wide range of tasks. You may use your die grinder to polish surfaces, cut through material, smooth out rough edges on wood or metal, grind away rust, sharpen blades, and much more, depending on the attachment you're using.
  • The angle grinder: Angle grinders are similar to die grinders in function, however same same but different. Angle grinders are big, but still portable, disc-equipped hand tools. The cutting tool is a disc that spins at a very high speed. An angle grinder can easily cut through material such as metal or wood, grind down material, and even polish surfaces with the correct disc.

5. Can you use a die grinder to cut metal?

Basically is it can, but depending on the die grinder bits user is equipped. Here are some die grinder bits that can be found in the market.

  • Grinding Bits
  • Polishing Wheels
  • Carbide bur
  • Wood Cutting Wheels
  • Metal Cutting Wheels
  • Grindstone Bits.
  • Wire Wheels
  • Sanding Wheels

Each bit have their own function. However, cut metal need lots of power, it's not suitable for a long time using. You can consider buying a cutting-off tool or angle grinder with plenty of power.

How To Choose The Best Air Die Grinder?

At the first time buying Air Die Grinder, the buyers can be overwhelmed at the variety of shapes, sizes, air capacities, and configurations that these tools are available. And it is not easy to decide which one is good and which one is poor quality? To analyze the specification of the machine, we need to understand the metric in technology.

Pneumatic tools are rated using several metrics: Free Speed (RPM), Air Pressure (psi/bar), Air Consumption (cfm/scfm or m3/min), Horsepower (hp), and spindle size. Each individual tool has its own specific requirements which determine its compatibility with air compressor systems.

Here are some factors the buyer can refer.

1. Durability:

With the cheap die grinders in the market, they usually have plastic bodies that easily corrosion every time use them. That is the reason why many buyers are ready to pay the extra buck and go for die grinders with aluminum casings. They last longer and avoid corrosion better.

2. Convenience to use

The grinder you choose should be easy to use according to your standards. To know it, you should check clearly about the product information like its weight, height (make sure it fit with your hand and you can hold it easily and correctly), its power source (electric or pneumatic one),…

3. Revolutions Per Minute (RPM):

RPM is a measure of the frequency of a rotation. It states the number of full rotations completed in one minute around a fixed axis. It is used as a measure of the rotational speed of a mechanical component. In other words, it is how many times something rotates every minute. It is used as a measure of how fast a machine is turning. So if a motor is turning at 100 rpm it means that for every minute the motor is running it makes 100 complete turns.

4. Compressor/Tank Size:

An air compressor and air hammer perform professional work, maintenance, and repair tasks easier and faster. Compressor tank size, motor horsepower (hp), air volume output (CFM), and air pressure (psi) must be sufficient to operate the air hammer.

The volume of air the compressor can produce (CFM) and the air pressure contained in the tank (psi) are the most important considerations. These specifications are typically marked on the tank’s label. Each air impact hammer requires a minimal CFM (cubic feet per minute) at a prescribed psi (pounds per square inch) to properly operate at full efficiency.

5. Collet Angle

For the pneumatic die grinder, users should check the angle. Pneumatic die grinders can be categorized into two classes based on their angle of attack:

  • 90-degree angles: These are designed to assist to reach difficult areas and tricky corners, particularly on metal structures. Welders and metal workers are the most common users of 90-degree die grinders.
  • 0-degree or linear die grinders: Linear die grinders are useful for cutting into hard metals and can be linked to small saws. In comparison to the 90-degree kind, this one is considerably easier to control, especially in smaller versions, which leads us to the next point.

Which Brands Make The Best Air Die Grinder?

Ingersoll Rand: Steady producing quality products since 1871, Ingersoll Rand is a top player in the manufacturing industry. The Irish-American company deals in air solutions, tools, material handling, and so on. Ingersoll Rand air hammers are designed with maximum efficiency in mind - ensuring that the tool does the work, not you. They will deliver the punch you need to get the job done fast and comfortably, including exhaust and front-end jobs, general bolt cutting, pin driving, and body shearing work.

Chicago Pneumatic: Chicago Pneumatic is a brand name in the pneumatic tool industry which has a history traced back to 1889. For decades, Chicago Pneumatic has had a heart for the general industry and matches your highest demands with the right solutions. While our history and general product offer provide you with a general background of our brand, the principles, and technologies section will familiarize you with the practical side of our products. This gives you the right know-how and confidence to take your business to the next level. It is simple, really. You have work to do, customers to serve. Chicago Pneumatic is there to help you get the job done, without compromise.

Astro Tool Corporation: Astro Tool Corporation is a 60-year old U.S. manufacturer of high-precision tooling for electrical connector service and wire assembly. We have been on the MilSpec QPL since its inception in 1969 and provide tooling meeting the stringent M22520 and M81969 requirements for Mil-spec connectors and contacts. Astro Tool is proud to engineer and manufacture its products in the USA.

PROSHI: PROSHI as a professional manufactory & exporter of air tools, power tools, and hand tools, automotive tools products, has been designing, producing, and selling high-quality Industrial/ professional/ DIY class air tools. Power tools, hand tools, automotive tools products to worldwide customers. Our customers mainly come from South America, North America, and Europe Markets.

Conclusion

Air Die Grinder, also known as Pneumatic Die Grinder, is the perfect one-handed power compressed air tool for polishing, sharpening, cutting, or grinding various materials. One Air Die Grinder can offer a versatile functioning system. It makes human life easier and becomes a great assistant for the job. It will be a miss if you don’t own one Best Air Die Grinder!

Layton
Layton

"I am Layton, a gardening and DIY enthusiast, I love to share my experience with the community for essential tool needed for everybody to repair home, take care of their lawn, and other projects and learn back from the others about how they take care of their home, especially from DIY works"


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