Angle Grinder Sizes and Power Explained

Angle grinders are portable tools that are often used in different industries such as construction, woodworking, and metalworking, among others.

When it comes to operation, the angle grinder size and power are important features that go a long way in determining its effectiveness.

This tool is the most commonly used and recognized model that exists for such practical applications.

The power used in the operation of an angle grinder can be generated from a petrol engine, an electric motor, or an air compressor.

The speed is also an important feature. The one with which you operate your machine highly depends on the type of material that you are working on at that time.

Angle Grinder Sizes and Power

Angle Grinders Sizes

As already mentioned above, there are different sizes of angle grinders. There’s the small angle grinder, medium size angle grinder, and the large angle grinder.

Small Size Angle Grinder

Small Size Angle Grinder

They mostly come in 4 inches or 4½ inches. These angle grinders work for wheel diameters that go up to 7 inches and the smaller versions have 3-inch diameters.

These small angle grinders feature brushless motors so there’s no need to constantly change the brushes. This feature also facilitates efficient operation when it comes to the cordless type.

It minimizes heat build-up thus promoting the tool’s durability. They also have kickback brakes for safety. Some of them also have two-stage triggers for extra safety leaving no room for accidental starts while changing discs.

Medium Size Angle Grinder

Medium Size Angle Grinder

7″ angle grinders are the medium size angle grinders. Most medium to large size angle grinders are often corded.

When getting a medium size angle grinder, ensure it comes with a motor that has at least a 3 horsepower capacity.

Large Size Angle Grinders

Large Size Angle Grinders

The ones with discs that fall up to 9 inches are in a large category. The large ones are your best pick if you will be taking large or substantial cuts.

They can also properly scan considerable surfaces in just a single pass and have the very strong horsepower. Large grinders are mostly used to cut things like asphalt and other dense materials. A large angle grinder typically features motors that have 5 horsepower capacity.

Angle Grinder Power

An angle grinder’s wattage is what indicates its motor’s power. The value is usually dependent on the size of the angle grinder.

Those with larger grinding and cutting discs need more power which is why they have a higher wattage.

An angle grinder that features a higher wattage is more capable of keeping up with spindle speeds that are a lot higher under load. They are therefore widely used for heavy-duty applications or tough cutting tasks.

Normally, angle grinder’s wattage ranges from between 500 to 2,500 watts. Usually, 500 watts is recommended for sharpening or auto body work.

If you will be using your angle grinder for grinding, pick the 1000 watts one.

For cutting through those very simple materials, you should go for the 1500 watts angle grinder while 2,500 is recommended for strong metal cutting.

When it comes to angle grinder wattage, the input power of any corded type is rated in terms of amps (A). That said, cordless ones it is rated in terms of volts (V).

For the more powerful grinders, that is medium to large size, motors draw from around 5 to 9 amps when it comes to current.

Some of the large-size ones can go up to 15 amps in rating. The reason why these large size angle grinders can handle the toughest cutting operations is that their motors will not overheat in the process.

For jobs that do not require too much power, small angle grinders will do. These have amp ratings of between 3 and 4.

Note that in most cases, the amperage of these tools is not indicated as part of the product specifications. However, you can work these out yourself by dividing the wattage it comes with by the voltage.

As mentioned above, corded angle grinders have their power indicated by amperage while cordless ones indicate these by voltage. Thus the higher the voltage of the cordless angle grinder the more powerful it is.

How does Wattage Influence the Capacity of Angle Grinder?

Wattage is the amount of power that is required for one to get an angle grinder to work. The wattage value usually reflects the grinder’s size.

Typically, higher wattage grants you more power to cut through materials that are denser. The larger the grinder you have, the larger the wattage.

If you are going to be handling a task that is simpler such as polishing, you will need lower wattage. For grinding, you will have to raise the wattage to an extent since the task is a bit heavier.

However, when it gets to cutting, you should go with 1500 to 2500 wattage. The latter is best if you will be cutting through metals and other very strong materials.

However, if you will be cutting on simpler materials, the former works just fine. So when you set out to buy an angle grinder make sure you keep in mind what you want to use it for.

Its wattage will tell you just how effective it will be, keeping in mind it’s all proportional. The bigger the wattage the more power you’ll get.

What is a good amp for an angle grinder?

The amp of an angle grinder is the measure of its power output. More powerful angle grinders will usually draw around 5 and 9 amperes of current.

If you have a heavy-duty angle grinder the amp rating could even be as high as 15. Generally, these are meant for tougher grinding and cutting applications.

If you will be using your angle grinder for jobs that are less intense then an amperage rating of about 3 or 4 will be sufficient.

What is the most common angle grinder size?

There are different angle grinder sizes. The one you settle for should typically be according to the amount of work you will use it for.

Out of all these existing sizes, the most common disc sizes are the 4 inch and the 4 ½ -inch angle grinders.

These can handle wheel diameters of up to 7 inches. They are very versatile meaning they can be used for a variety of applications.

How many watts is an angle grinder?

Wattage is the amount of power that is required to work your angle grinder.  It could range between 500 and 2500 watts depending on just how big your angle grinder is.

A larger angle grinder will usually mean larger wattage while a smaller one means less wattage for lighter tasks.

Today, there are several brands that manufacture angle grinders due to the immense demand for them.

The different models are suitable for both amateurs and people who are professionals in using them for different applications.

Examples of popular brands that manufacture these highly useful tools include Bosch, Hitachi, Dewalt, Makita, among others.

Each angle grinder will usually have different specs by the manufacturer that you should pay attention to. When you are on the search for one make sure you pay close attention to the power of the angle grinder.

Also, be careful with the sizes and power of the angle grinders as these are the most important for efficiency.

Bear in mind that it is all proportional whereby the larger, the more effective and the more tasks it can handle and vice versa.

Arthur Kyser Morn

Hey Guys! It's me Arthur Kyser Morn, aka AKM, the proud founder and author of Tools Auditor. I'm a content marketer, a dad of 2 lovely sons, and a handyman. I love trying out new tools, and together with my team, I've been creating helpful guides since 2017 with tools and DIY tips.

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