Chicago Electric Angle Grinder. Construction grinder

If you are serious about metal fabrication, DIY or even upcycling, you probably either own or have considered buying an angle grinder.

What is an angle grinder?

An angle grinder is a handheld power tool that can be used for a variety of metal fabrication jobs that include cutting, grinding, deburring, finishing and polishing. The most common types of angle grinder tools are powered by electricity; either corded or battery powered.

Which abrasives discs you select to use with your angle grinder depends entirely on your specific application and the material you are working with. Read on for more on this.

Why buy an angle grinder?

Versatile and easy to use

It’s the most versatile tool in the box and should be a staple of any shed or workshop but we aren’t just saying that because they work perfectly with many of our abrasives!

An angle grinder tool with the right disc can replace numerous tools and make the most tedious, labour intensive jobs quicker and easier.

Better yet, they are easy to control and any novice with the correct safety precautions can pick up an angle grinder and start working. This makes them perfect for DIY projects.

What is most common angle grinder size?

Angle grinder tools come in many different sizes, the most common size sold in the UK is 115mm. This sized model is light, precise and generally very easy-to-use; making it a great choice for the beginner and professional alike.

A wide choice of angle grinder models and brands available

Unlike a lot of specialist tools and abrasives, you can walk into any nearby hardware store in the world and find an angle grinder for sale.

There are huge number of different models and brands to choose from, at varying price points.

Your budget, your level of usage, and your experience should be the key influences over which angle grinder you purchase. Don’t go spending over the odds on a high-end model that’s only going to be used twice a year.

Which angle grinder disc do I need?

So you’ve purchased your angle grinder, now which discs do you need? In the first instance you need to determine the type of material you are working with – metal or masonry?

Then, what are you doing to the material, is it cutting, grinding, stripping, finishing, or all of them?

Angle grinder discs for cutting metal

These products can be very broadly categorised as either for cutting or grinding.

Cutting metal: Cutting Discs

Metal cutting discs are designed to cut through metallic items as quickly as possible.

The type of disc you choose will depend heavily on the hardness, thickness, and the metal itself.

For example, an entirely different disc would be required when cutting aluminium vs. cast iron as our application table shows.

Some of the more premium, sharper grained cutting discs also offer a higher level of comfort by reducing the amount of pressure required to cut through the metal.

Thinner cutting discs such as the Ultra-Thin range of 1.0mm and 1.3mm are ideal for metal pipes, thin gauge metals and tubular workpieces.

Logically therefore, a thicker heavy-duty disc is used for more robust pieces of metal where more stability is required.

Our top tier cutting discs are found in the Norton Quantum3 range.

With a self-sharpening ceramic grain, Norton Quantum3 discs are fast, effective, and comfortable to use; performing time after time.

Grinding metal: Grinding Wheels and Flap Discs

Whether you are preparing carbon steel for painting or finishing a weld seam. grinding wheels and flap discs are essential accessories for the angle grinder.

Selecting the right grinding wheel can be quite complicated and will depend heavily on the desired surface finish you require from your metallic workpiece.

A highly polished, decorative finish on stainless steel for example requires more steps and usually a higher degree of technique than simply roughing the surface of carbon steel to improve paint adhesion.

Why not read our definitive guide on choosing grinding wheels for more information?

Stripping metal: Stripping Discs

For stripping heavy coatings (such as paint or rust) from metal or wood, you will need to choose a coarse grit fibre disc, flap disc or Norton Rapid Strip disc.

Depending on the condition and amount of coating to be removed from metal, you could opt for a coarse abrasive.

Starting with a coarse grit will allow you to strip the coating quickly and minimise loading of the disc, however it may impart deep scratches on the surface.

For rust removal, use a 60 or 80 grit flap wheel or Rapid strip disc.

Rapid Strip discs are particularly suited to removing rust and de-burring metal without damaging the workpiece itself.

Angle grinder discs for cutting concrete and masonry

Generally, a diamond blade would be the best choice for cutting concrete and masonry.

Unlike the cutting and grinding wheels for metal, a diamond blade is predominantly metallic product itself.

Its basic general structure is a steel centre with outer segments containing synthetic diamond fragments that give the blade abrasive qualities.

These diamond segments are ideal for cutting concrete, bricks, and building materials, and natural stone.

Harbor Freight Chicago Electric 22 year Old 4.5 Inch Grinder Overview

Once you’ve picked the right disc for your project, you just need to make sure you find the right size and speed for your specific angle grinder.

Why not try the Invincible Diamond Blade from Norton Clipper?

Product is subject to availability

Setting the correct speed

Angle grinder discs have a maximum safe RPM that they should be operated at, which prevents them from breaking apart while in use and potentially causing an injury.

Make sure that your right angle grinder tool does not exceed the recommended RPM for the product you are using, bearing in mind that most right angle grinders run at a fixed speed of around 11,000 RPM.

Personal Protection Equipment

Once you’ve chosen the right angle grinder discs for your project, you need to prepare your work station.

Whatever you’re working on, you’ll be generating dust, flying debris and possibly even sparks.

To keep yourself safe, make sure you wear work gloves, a dust mask, safety glasses and a full face shield.

It’s also a recommended that your work somewhere that is properly ventilated, and always use the safety guard during operation to protect yourself.

In the extremely rare event of wheel breakage, the guard is designed to project all disc debris away from the operator, so always ensure no-one is in the potential path of debris if the worst would happen.

For the safest operation, we’d recommend that your angle grinder features a ‘dead man switch’ too.

This means you’ve got to keep the switch in the on position while in use, so if you were to let go of the grinder, it would switch off, reducing the risk of injuries.

Check the expiry date

Cutting discs and grinding wheels for the angle grinder have an expiry date which you need to pay attention to.

To find this, simply check the inner metal ring on the disc and look for a date stamped there.

Getting started

So now you have chosen the correct angle grinder discs for your specific application, safely set up your work station and taken all necessary safety precautions, below are some tips for how to work on each material.

How do you cut metal with your angle grinder?

When it comes to cutting metal, a right angle grinder saves a lot of time and effort versus using a standard hacksaw.

Ensure that you clamp the workpiece securely in a vice and select a suitable metal cutting disc.

Make sure each side of the cut is supported, so there is no possibility for it to move and ‘pinch’ the disc as you are cutting, potentially causing wheel breakage.

Hold the grinder tool straight and use light pressure to cut through the metal, let the cutting disc do to work, do not try to force it through the workpiece.

Move the disc backwards and forwards along the cut, take care not to twist the grinder as this will cause the disc to warp and bend.

Too much pressure will also result in the cutting disc wearing prematurely, which means you’ll be replacing worn out discs more often than you want to!

Cutting ceramic tiles, concrete and stone with an angle grinder

An angle grinder can be used to replace a larger tile saw to cut ceramic tiles, concrete paving stones, and many other types of stone.

For this type of work, you would need either a cutting disc that specifies use with masonry or (more commonly) a diamond blade.

Diamond blades often cost a bit more but will last significantly longer and cut faster.

Another handy use for the right angle grinder is cutting ceramic tiles.

For this application you will need to use a continuous rim diamond blade that is designed to cut through hard tile and leave a smooth cut.

An ordinary segmented diamond blade would be unsuitable for this kind of work as it would almost certainly cause a a rough, chipped edge.

When cutting paving stones, stone and tile, make sure the workpiece is secured before cutting.

Using light to medium pressure, move the grinder in a back and forth motion through the cut.

This helps remove dust from the cut and allows the wheel to cut faster. It is important not to twist the grinder when in use as this can cause the disc to warp and with some lower quality blades, the segments themselves to break off.

For more information about how Norton can help you make the most of your right angle grinder, download our Right Angle Grinder Solutions Brochure.

Alternatively, please get in touch via our webform.

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Chicago Electric Angle Grinder

This angle grinder has a powerful ball-bearing motor that provides smooth-running power to tackle the hardest metal cutting, shaping and slag removal jobs! Features include a tough aluminum construction for durability, a recessed spindle lock and a two-position auxiliary handle for comfort and control along with carbon brushes. This angle grinder is a powerful tool for the professional metal worker or hobbyist.

All ball-bearing motor for smooth running, long life Rugged cast aluminum gear case takes a pounding Two-position auxiliary handle Spindle lock for fast, easy wheel changes Comes with 4.5″ grinding wheel, spindle nut, two wrenches, spare brushes

Volts: 120 volts (60 Hz) Amps: 4.5 Watts: 570 Grinding speed: 11,000 RPM Arbor: 5/8″ threaded spindle with 7/8″ arbor adapter Shipping Weight: 5.05 lbs.

Reader Reviews

Review Summary

So here’s the story. I went to get my DeWALT 4 1/2 angle grinder repaired as the gears had finally given out, after many years of use. They wanted 50.00 to fix it, so when I saw these for 21.00, I thought I would give them a try (I bought two). That was ten years ago and these Chicago Electric grinders are still running fine, and I have put them through some heavy use.

If your still a doubter go to the Harbor Freight web site and read some of the 80 plus reviews that confirm my experience.

How to Use an Angle Grinder

This article was co-authored by Alberto DeJesus. Alberto DeJesus is a Construction Specialist and the CEO of DeJesus Industries. With more than four years of experience, he specializes in high-end real estate development and construction. Alberto and DeJesus Industries have been featured on NBC News and have worked with numerous well-known companies, including Mazda, Amazon, and CVS. Alberto holds a Bachelor’s degree from Boston University.

There are 9 references cited in this article, which can be found at the bottom of the page.

wikiHow marks an article as reader-approved once it receives enough positive feedback. In this case, 100% of readers who voted found the article helpful, earning it our reader-approved status.

This article has been viewed 178,775 times.

Angle grinders are electric power tools with detachable grinding wheels that you can apply to a variety of jobs around your home, including sanding, grinding, cleaning, and cutting. When using a grinder, make sure you’re picking the right attachment for the job and using that attachment correctly. Always practice safety procedures when working with a grinder, as it can cause injury, both from the blade itself and from flying debris. [1] X Expert Source

Choosing and Applying the Right Attachment for the Job

• Try buzzing off dirt that’s set on garden tools. It will even work on set-on cement.
• Pick the cup wire attachment for flat surfaces and the wheel to get into crevices.
• Make sure to pick the right type of blade for the project you’re working on. For metal, a cutoff wheel works well, and it’s fairly cheap.
• For masonry, tile, and concrete, choose a diamond wheel. Read the attachment to know what materials you can use the wheel on. [4] X Research source

• Don’t let the blade get too hot, as it will become very brittle. If it turns black or blue, give it a rest for a moment.
• Check the wheel for the arrow showing you which direction it will rotate when on.

Operating an Angle Grinder Safely

Put on safety gear like goggles, long sleeves, and full-face protection. One of the main dangers of an angle grinder is flying debris, including pieces breaking off of the tool’s attachments. Protect yourself with safety gear so you don’t catch a piece in your eye. [7] X Expert Source

• Put in ear plugs or cover your ears with noise-canceling earmuffs, as the sound from the machine can get very loud.
• Wear a dust mask for particularly dusty jobs, like sanding and grinding mortar. [9] X Research source
• Grab the handle with whatever hand feels most comfortable.
• The deadman’s switch is a safety feature. If you accidentally drop the grinder, it will go off automatically.

Let the grinder come to full speed before applying it to the surface. Hit the power button to turn it on. Whether you’re cutting, grinding, or sanding, allow it to come up to speed to help you keep your actions smooth and consistent. For instance, if you’re cutting through metal or other materials, you’ll get a better cut if the cutting disc is at full speed first.

Move the angle grinder around constantly when sanding or cleaning. Don’t keep the tool in one place when sanding, as you could end up with gouges. For a smoother finish, move in a rotating motion over the surface. If you’re trying to smooth or clean one particular area, don’t hold it in place; just move it around and over the area until it’s to your satisfaction. [10] X Research source

• With cutting, use the side of the wheel to cut the piece head-on, meaning you should hold the wheel perpendicular to the piece you’re cutting.

Keep the guard on no matter what you do. The guard may get in the way on some projects, but don’t take it off. It provides some protection from flying debris if the wheel or attachment shatters. It’s much better for the guard to take the hit then your torso or arms! [12] X Research source

Picking Angle Grinders and Accessories

Choose a 5-9 amp motor if you plan on using the grinder a while. If you want to use the grinder for a number of projects, try not to get the cheapest one. If you spend a little more, you can get a better quality machine. Pick a motor that pulls 5-9 amps, which will give you a little extra power and will likely stay in operation longer. [15] X Research source

• That way, if you turn your grinder to max, you still won’t go over the max speed of the accessory.
• A grinding disc with noise reduction and a handle that reduces vibrations can also make your grinder safer.

Community QA

Always wear eye protection and gloves, and point the grinder away from yourself; it might be a good idea to use it on a safe grinding area as well, along with clamps, vices, etc. Before grinding, examine the power cord, extension lead, plugs, sockets and power outlet for damage. Also, ensure that the grinding disc, guard, and attachments (including handle) are secure and correctly fitted. Lastly, inspect the grinding disc for damage; never use a damaged grinding disc, and never use a disc on a surface that might damage it.

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Join the axle pipe with the center point of the wheel, and make sure that the wheel rotates smoothly.

Thanks! We’re glad this was helpful. Thank you for your feedback. As a small thank you, we’d like to offer you a 30 gift card (valid at GoNift.com). Use it to try out great new products and services nationwide without paying full price—wine, food delivery, clothing and more. Enjoy! Claim Your Gift If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even 1 helps us in our mission. Support wikiHow

Choose/purchase the correct disc, be it for metal or masonry, and make sure it’s fixed correctly and tightly. Wearsafety goggles. Hold the grinder very tightly and proceed with caution.

Thanks! We’re glad this was helpful. Thank you for your feedback. As a small thank you, we’d like to offer you a 30 gift card (valid at GoNift.com). Use it to try out great new products and services nationwide without paying full price—wine, food delivery, clothing and more. Enjoy! Claim Your Gift If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even 1 helps us in our mission. Support wikiHow

The Best Angle Grinders, According to 27,500 Customer Reviews

Welcome to the Thomas guide to the best angle grinders 2023. Thomas has been connecting North American industrial buyers and suppliers for more than 120 years. When you purchase products through our independent recommendations, we may earn an affiliate commission.

An angle grinder is one of the more versatile power tools in a toolbox. They are excellent for cutting metal, steel, or other hard materials. They can also be used to sharpen metal tools or cut construction materials, though sharpening blades with an angle grinder takes practice and professional knowledge. Some professionals even use them to sand a wood carving or remove corrosion from tools.

Good grinders can easily cut through most types of metal. They have a strong and oftentimes cushioned handle as well as easily accessible buttons to change speeds and turn on and off. Users should always use safety goggles during the grinding process as a safety precaution, especially when using one of these tools to cut metal.

Here is a list of the best angle grinders, followed by a buying guide to help you select the best angle grinder.

Thomas’ Top Picks for the Best Angle Grinders 2023

Review our list below to find the best angle grinder for your needs from pneumatic, cordless or corded models.

Best Pneumatic Angle Grinders: Ingersoll Rand 5102MAX Air Die Grinder | Buy Now

Best Compact Angle Grinders: Bosch Angle Grinder | Buy Now

Best Angle Grinders for DIY Projects: Avid Power Angle Grinder | Buy Now

Scroll down to read more about these top picks for the best angle grinder, according to many happy buyers.

listed in this article were as shown in US on amazon.com (USA) as of May 2023

Best Angle Grinder with Diamond Blade—DeWALT Angle Grinder

With a powerful 11-amp motor, this DeWALT 4.5-inch angle grinder boasts a lot of power. The blade can be used for dry or wet cutting while its DeWALT dust ejection system stops dust and debris from getting into the tool. It also features a paddle switch design, spindle lock button, tool-free wheel removal, and spiral bevel gear.

“This DeWALT angle grinder tool has a kick like a mule because it is that powerful,” wrote a customer. “It’s got torque like few other hand tools I’ve experienced. The revolutions on this thing are so fast it actually feels lighter when activated.”

Disc size: 4.5 inch

Dust catcher: Yes

Motor power: 11-amp motor

Best Cordless Angle Grinder—DeWALT Cordless Angle Grinder

When looking through cordless angle grinders to buy, long battery life is usually top on the list of musts, which is why this DeWALT angle grinder with its brushless motor topped our list for the best cordless model. The kit includes the grinder, a Rapid charger, and a 60V battery. The variable speed works depending on how much pressure is placed on the power button, with light pressure for low speed and hard pressure to reach the maximum speed.

“Without question, this tool is a beast,” raved one reviewer. “It never bogged down under the most intense use and was light enough to make using it a pleasure. The power on this 60-volt model is exceptional—particularly considering it is battery powered.”

Chicago Electric 4-1/2″ angle grinder model 42204 testing parts for sale broken head

Wheel diameter: 4.5-inch angle grinder

Dust catcher: No

Motor: Battery-powered brushless motor (13-amp motor equivalent)

Best Corded Angle Grinder—BLACKDECKER Small Angle Grinder

There are many different ranges of power tools available for professionals and homeowners alike, so even those on a budget can find an affordable angle grinder for their needs—this BLACKDECKER power tool is a prime example. For under US30, shoppers can get this small angle grinder that has three different handle positions for a more firm grip for different projects.

It can be used with type 27 or 29 flap discs and comes with both a metal grinding wheel and a wheel guard. “Will cut through about anything,” described one shopper. “I use it on a regular basis when modifying my Jeep Cherokee, and when a large branch fell on my house, I grabbed it to cut through some limbs.”

Disc size: 4.5-inch angle grinder disc

Dust catcher: No

Motor: Power output at 120V

Best Pneumatic Angle Grinder—Ingersoll Rand Angle Grinder

Matching the power of a gas grinder, this pneumatic angle grinder from Ingersoll Rand is one of the more versatile tools buyers can add to their toolboxes. It can be used to polish, grind, sand, or hone a variety of materials, including wood, plastic, cast iron, or steel. Customers did note, however, that the guard for the blade does not come with the kit, and the different size holders and mandrels are sold separately.

“Build quality is exceptional—and I am a mechanical engineer who designs stuff like this for a living,” explained one shopper. “Very good ergonomics. The button to lock out the spindle for tool changes is much, much handier than I was expecting it to be. No more fumbling with two wrenches.”

Disc size: Most discs that are compatible with a ¼-inch shank size or 6mm collet

Dust catcher: No

Motor: 20,000 rpm

Best Powerful Angle Grinder—Makita Angle Grinder

Cordless tools with a powerful brushless motor, like this Makita angle grinder, offer the freedom and flexibility of working in tight spaces. The small diameter barrel grip on this versatile tool makes it easy to steady this machine even with the strong power output it gives. One customer felt that they would have preferred a trigger-style power switch but the overall consensus from the majority of customers was that this angle grinder is easy to use and a top product.

“I used it to cut out two 20-inch circles from 10 gauge expanded metal as grates in my burn barrels,” explained one customer. “Again, no problem whatsoever. Wore out one cut wheel and ¼ of the next.”

Disc size: 4.5-inch flap disc

Dust catcher: No

Motor: Brushless motor that works with 3 or 4 amp motor batteries

Best Grinder Kit—WORKPRO 20V Angle Grinder Kit

As a complete angle grinding kit for anyone starting out, this WORKPRO cordless power tool set includes five metal cutting wheels, five grinding wheels (including a cutoff wheel and a grinding wheel protector), the battery, charger, and wrench. Other features include an electronic brake and an ergonomic three-position handle.

“No problem cutting through ¼-inch angle iron,” described one consumer. “Really like the three positions for the handle. I mainly bought it to grind, buff, and use with a wire wheel, but was pleasantly surprised at how well the battery did when it came to actually cutting.”

Disc Size: 4.5-inch angle grinder

Dust catcher: No

Motor: Brushless motor

Best Angle Grinder with Spindle Lock—DeWALT Paddle-Switch Angle Grinder

Using an angle grinder equipped with a spindle lock like the one found on this corded DeWALT grinder is a good safety feature when grinding for long periods. What’s more, the convenient paddle switch locks on for heavy-duty jobs. This tool doesn’t come with grinding wheels, and it does not have an electronic brake.

One customer who is a truck mechanic wrote, “I have put many quality grinders in their final resting place. [For] most of them, you could tell on day one what to expect. This one will be with me at home for the rest of my years. I fed this thing a hot supper for eight hours straight upon receipt.”

Disc size: 4.5-inch angle grinder

Dust catcher: No

Motor: 11 amp motor

Best Compact Angle Grinder—Bosch Angle Grinder

To cut metal in hard-to-reach places, small angle grinders like this four-pound Bosch angle grinder are excellent. Aside from the tool, buyers will receive a tool-less disc change, a flange kit, a spanner wrench, and a grinding wheel.

The size makes it deserving of a spot in tool bags, but be aware that the case can get hot with extended use. Buyers can also purchase this model with a dust ejection system for smooth operation. “Sweet grinder,” expressed one shopper. “Bigger amps than similarly-sized grinders. Fits the hand well.”

Disc size: 4.5 inches

Dust catcher: No

Motor: 8.5 amp motor

Best Variable Speed Angle Grinder—Makita Angle Grinder

The five variable speeds on this Makita angle grinder make it one of the more versatile grinders available. It can cut anything from granite to metal with different grinding wheels. The only caveat is that this grinder gets very hot when cutting thicker materials, so gloves should be used to protect the hands.

It comes with a three-year warranty. One reviewer expressed, “Drilled a three-inch hole in concrete as well as cut some four-inch cast with a diamond blade. Variable speed is worth every penny.”

Disc size: 5 inches

Dust catcher: No

Motor: 13 amp motor

Best Angle Grinder for DIY Projects—Avid Power Angle Grinder

DIYers will like the features of this Avid Power angle grinder for projects around the home. The blade guard protects users against flying debris, while the two-position handle allows for more control when working on specific materials.

Some buyers didn’t find the instructions to install the shield piece easy to read, but this component should easily move at a 360° angle if installed correctly. “This is just what I needed,” wrote one shopper. “Plenty of power for just about anything I do around the house and DIY projects.”

Disc Size: 4.5 inches

Dust catcher: No

Motor: 7.5 amp motor

The Best Angle Grinders—Summary

For a complete cordless angle grinder kit that includes everything needed to grind, cut or polish, the WORKPRO angle grinder (US84.99, Amazon) is a top choice. The versatility that the five variable speeds bring to many projects is also an excellent option with the corded and powerful Makita grinder (US181.26, Amazon).

Choosing the Best Angle Grinders—Buying Guide

Read on below to learn more about the different angle grinders and their best uses.

Types of Angle Grinders

There are four main types of angle grinders available, each with its own strengths, limitations, and type of power source. Most angle grinders can either be cordless, corded, gas-powered, or pneumatic.

Cordless Angle Grinders

Cordless power tools do not have the distance limitations of a power cord and allow operators the freedom of using them wherever they want, even outdoors. With battery technology improving every year, some cordless models are on-par, power-wise, with electric models. The only limitation of battery-powered grinders is if users don’t have a backup battery, then cordless grinders will generally only have a little over 45 minutes of run time.

Corded or Electric Angle Grinders

Corded models are one of the more popular types of angle grinders purchased for their power and unlimited power duration. A corded grinder is restrained by its cord, but for bigger jobs, a corded model doesn’t require batteries or the high maintenance needed for a pneumatic or gas power source angle grinder.

Pneumatic Angle Grinders

Pneumatic grinders work by using air pressure from an air compressor. When it comes to power levels, these would come just after gas-powered angle grinders and can be very expensive to own and operate, considering that air compressors have to be changed often because the refills are quite small and don’t hold that much air. One perk to a pneumatic version is that is tends to run longer than a cordless tool and is more powerful than a corded model.

Gas-Powered Angle Grinders

Like most gas-powered tools, gas angle grinders are the most powerful angle grinders available on the market. They are more expensive than other types of grinders and are also heavier. Additionally, gas-powered versions require a lot of maintenance and are not a top choice for smaller jobs.

We hope our review of the best angle grinders has been helpful, whether you were after something for heavy-duty projects or a model with the best safety features.

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