The 8 Best Pneumatic Die Grinders

If you are someone who has hands-on experience with metal works, then you would have realized the importance of a Die Grinder. Besides the obvious applications for grinding, these tools are also useful for polishing, machining, sanding, and honing materials. Also, they are helpful in engraving as well.

Best Pneumatic Die Grinders

Die Grinders are usually of two types-Pneumatic and Electric. Both of them have their advantages and uses. In this article, we will be talking about pneumatic cylinders and list the best products in the market. Moreover, we will provide a brief buying guide about the features of a pneumatic die grinder.

1) Ingersoll Rand

Ingersoll Rand 3101G 1/4' Heavy Duty Angle Die Grinder, Black

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This die grinder is quite popular for its design and performance. It is fairly cheap but still offers a lot of good features. The construction is sturdy but also light for easy handling. It comes with an ergonomic grip and offers outstanding torque accuracy. The motor has a power rating of about ⅓ HP, which makes it good for everyone.

It comes with great features like a collet, self-lock throttle, and rear exhaust. And the angled design of the product ensures that it can be used in tight spaces. 

Pros

  • 1-year warranty
  • Comfortable grip
  • Angled design

Cons

  • Not the best build quality

2) Chicago Pneumatic

Chicago Pneumatic CP875 Pneumatic Right Angle Pistol Grip Die Grinder with 1/4'' Collet, 22,500 RPM

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Chicago Pneumatic does make some pretty good grinders and this is one of those. The first noticeable thing is the angled tip. It is quite versatile and can do pretty much anything from metal cutting to paint removal. The body is made of Aluminum alloy. The alloy is durable but light, which helps in ease of movement.

The tool can be used not only on metals but also on wood as well. With this grinder, you will get some wrenches to change the burr. It also features a lock throttle mechanism, which ensures increased user safety. 

Pros

  • Compact Size
  • Lock-throttle
  • Versatility

Cons

  • Nothing much

3) Ingersoll Rand 1/4

Ingersoll Rand 1/4' Air Die Grinder 3107G

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This grinder from Ingersoll Rand is quite compact and versatile. The ball-bearing construction is light and sturdy, which makes it easy to use. It comes with a motor speed of 27000 rpm and the motor has a power rating of ⅓ HP. This model is cheaper than the 3101G from the same brand. In terms of value for money, this is a great buy.

The ergonomic handle minimizes any sort of vibrations and makes it easy to handle. The 0 degree Burr Angle means that this grinder can also be used as a saw. Moreover, there is a safety lock as well for better user protection.

Pros

  • Safety lock
  • Ball-bearing construction
  • Lightweight

Cons

  • Poor speed control.

4) Astro Pneumatic Tool

Astro Pneumatic Tool 218 1/8' Pencil Type Die Grinder - 56,000RPM

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This grinder from Astro is best used to work in places that cannot be accessed by other grinders. It is light in weight and employs a design that helps to make it easy to handle. In fact, it weighs about 16 ounces, which is far less than the average weight for a grinder.

A standout feature of this grinder is the speed of 56000 rpm. The collet slot has a diameter of ⅙ inch and as a result, any extension of this range is possible. The twist throttle makes it easy to shift gears and the speed. Overall, a solid product ideal for professional mechanical works.

Pros

  • Speed control
  • Suits working in tight spaces.
  • Easy to handle

Cons

  • Nothing much

5) AIRCAT 6255

AIRCAT 6255 Professional Series Red Composite Angle Die Grinder With Angled Gear Mechanism

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Aircat is known for its pneumatic tools and this die grinder is another good product from them. The Aircat 6255 is quite powerful and offers high performance. It can be used with a high-pressure air compressor and works super quietly. The steel-grade gears used are long-lasting and have great build quality.

The motor has a speed rating of 20000 rpm, which is impressive. Also, it has a 1-year warranty as well. The speed control is easy and the power rating of ½ HP means the grinder can be used for the most demanding jobs.

Pros

  • Compact Design
  • Powerful
  • 1-year warranty

Cons

  • Not for continuous use

6) Chicago Pneumatic CP860

Chicago Pneumatic CP860 Heavy Duty Air Die Grinder with 1/4' Collet, 24,000 RPM

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Chicago Pneumatic is quite a popular choice amongst engineers and this model is meant for industrial use. The body is constructed entirely using Aluminum, which makes the grinder tough and keeps it light as well. Also, it features a square handle, so you won’t face issues while operating it.

The built-in regulator can alter the motor speed depending upon the needs. Moreover, it comes with a 2-year warranty. This grinder is ideal for polishing, cleaning tires, porting, etc. It has a power rating of around 400 watts, which makes it quite capable of any sort of task.

Pros

  • Good grip
  • Speed regulator
  • Throttle lock

Cons

  • On the expensive side

7) Astro Pneumatic Tool

Astro Pneumatic Tool 1221 Composite Body 1/4' 90° Die Grinder, Mini Die Grinder AND 8pc. Double Cut Carbide Rotary Burr Set

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This offering from Astro is a comprehensive solution for a craftsman or mechanic. It features a set of rotary burrs for different tasks. Moreover, there are 2 pneumatic grinders with a burr angle of 0 and 90 degrees respectively. Besides the angle difference, there is not much separating the two.

The handles are constructed using a composite material that offers a good grip for the user. The grinder is quite light and weighs around a pound. A throttle break is provided keeping in mind the safety of the user. Moreover, a rotary cutter is included as well.

Pros

  • Included accessories
  • Lightweight
  • Throttle break

Cons

  • No warranty

8) Chicago Grinder

Chicago Pneumatic CP876 Pneumatic Straight Die Grinder with Pistol Grip and 1/4'' Collet, 30,000 RPM

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This grinder is well suited for moldings and polishing. The robust build is due to the aluminum alloy used in the construction. It features a red finish that also adds to the aesthetics as well. The design is impressive and the grinder is quite stable in operation. To help you in speed control, a regulator is also integrated.

The exhaust situated at the rear end helps to reduce emissions. This grinder can be used with a medium-sized compressor and you don’t need to recharge it frequently. The collet diameter is 6mm and the grinder has an rpm of 30000. Moreover, it is quite light in weight.

Pros

  • Powerful grinder
  • Impressive design
  • Speed control

Cons

  • Nothing much

Buying Guide

Why do you need a Pneumatic Grinder?

You already know that Die grinders are mainly of two types-electric powered and pneumatic. Hence, why should you get a pneumatic grinder over an electric one?. The reasons are as follows.

  • No risk of electric shocks- Damaged wires could prove risky to the user. Pneumatic tools do not involve electricity and the motors used do not cause any spark.
  • Easy To Maintain– Pneumatic tools are easier to maintain and will cost you less money in the long run. In electric motors, after about 70 hours you would need to replace the brushes.
  • Better productivity-Pneumatic grinders are equipped with a speed control mechanism that enables them to work at the rated rpm.

Factors to consider while buying a pneumatic grinder

  • Collet Angle-Pneumatic Grinders can be categorized into 0 degree or 90-degree grinders. Grinders with a 90-degree wheel are used in welding and metalworks. They are quite useful when working in tight spaces. On the other hand, linear grinders are best suited for heavy-duty work like cutting through hard metals. In a linear grinder, the collet holder is behind the linear chamber.
  • Size-Usually, most of the grinders have a similar size and weigh around the same as well(about 3 pounds). The average RPM for grinders is in the range of 10 and 20 thousand. However, there is a model called the “pen” die which has a linear shape. This grinder is capable of reaching around 60000 RPMs. However, they are on the expensive side.
  • User safety-Many people underestimate the danger that a pneumatic grinder poses due to its size. However, these are quite powerful and you need to use protective equipment while using them. Use gloves to keep the hands safe. Also, protective eye gear is a necessity as lots of particles will be emitted while grinding. Moreover, earphones could reduce strain on the ears.
  • Extensions-Regardless of the kind of extension you use, you need to ensure that it fits on to your tools. Measure the collet diameter and ensure that the extensions can fit on it properly. 

Conclusion

Pneumatic grinders are essential pieces in a workshop and today we have listed the best of them. They are quite different from electric grinders and they offer different benefits. Moreover, we have also provided a brief guide on the important aspects of pneumatic grinders. So now you can easily choose one that fits your needs. 

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