4.5 Vs 7 Inch Angle Grinder: Head-to-Head Comparison!

Jacob Wilson | Dec 28, 2023

No matter whether you’re a DIY-er or a seasoned carpenter, having a particular angle grinder always comes in handy! But the thing that makes most of you confused is what to choose as there are so many types and sizes of grinders available around the current marketplace!

So today’s topic on 4.5 vs. 7-inch angle grinders is all about their noticeable differences, which I’ve gathered right here. I’ve found several differences in their weight, level of speed, and range of power.

In this case, if you don’t know which angle grinder should be your cup of tea, you’ll need to read the whole article from top to bottom. Are you ready?

Angle Grinder Quick Comparison Chart

7 Vs. 4.5 Angle Grinder: Detailed Comparison

So, do you want to get into a detailed comparison between these two popular angle grinders? If so, then you’re just a single step away from I’m going to describe their noticeable differences step by step. Let’s get started:

Difference in Weight 

This is by far the first noticeable difference you may observe while comparing them. Although the weight of an angle grinder varies from model to model, I can rest assured that you’ll find the 4.5-inch angle grinder more lightweight than the 7-inch.

In this case, a 4.5” grinder is available at a weight of around 3 to 10 pounds, while the 7” grinder is nearly about 14 to 20lbs.

Variations in Power

In a nutshell, 3 things significantly impact the power of an angle grinder: R.P.M., A.M.P., and Watts. By taking a closer look at the user manual, you can notice that a usual 4.5-inch angle grinder comes in about 1000-1100 RPM, nearly 3-7 A.M.P. motor, and 700 Watts.

On the flip side, a standard 7-inch angle grinder offers 6500-8000 RPM, around 13-15 A.M.P. motor with a wattage of 1600-1800. Thus, it’ll appear to be more powerful than the 4.5-inch grinder.

Speed Difference

Speed is closely connected to the rate of R.P.M. (revolutions per minute). As you know, a bigger-sized disc tends to spin a bit more slowly than a small-sized disc.

But it’s equally valid that smaller discs tend to get overheated too soon as they spics at a higher range of speeds.

The difference in Tasks/Compatibilities

Each of these angle grinders has its own unique specs, so it makes sense that they won’t be ideal or suitable for the same task. In this case, I have found the 4.5-inch grinder best for grinding, sanding, cutting, and such smaller tasks due to its smaller-sized disc.

The 7-inch angle grinder, on the other hand, is hands down best for performing mediocre to heavy-duty projects on account of its bigger-sized disc.

4.5 Vs. 7 Inch Angle Grinder: Which One Should I Buy? 

As I’ve mentioned earlier, both 4.5 and 7-inch angle grinder have their own unique specs and specialties. So it won’t be fair to make any of them a “clear winner.”

However, to help you decide which one you should pick up, I can share my personal decision or verdict. The 4.5-inch grinder spins faster, making it ideal for smaller tasks. Thus, it’s suitable for beginners or those who aren’t seasoned workers. 

Similarly, the 7-inch angle grinder spins slowly for its powerful heavy-duty motor, making it friendly for bigger/more challenging projects. So, I’d say this one can be your ultimate go-to if you’re a pro. 

Frequently Asked Questions (F.A.Q.’s): 

How deep can a 4.5-inch angle grinder cut? 

Needless to say, the 4.5-inch angle grinder features a blade of a diameter of 4.5,” meaning it has the capability of extending half of that total size (2.25-inch) in both directions. Consequently, it can only cut up smaller-sized objects no more than 4 inches in diameter.

To make deeper cuts, simply for the bigger one.

Which size angle grinder is best?

It’s not that easy to consider only a single-angle grinder as a champion. But if I talk about the popularity and versatility, then 4.5 and 7-inch angle grinders are the best, ranging from more minor to more significant projects.

A 9-inch angle grinder can also be your eventual pick-up for heavy-duty tasks.

What is a seven-angle grinder used for?

Due to the extensive range of power, a 7-inch angle grinder can easily bear heavy loads or pressure, making it useful for professional applications and deeper cuts.

Final Thoughts!

I hope you have excellent ideas from comparing the 4.5 vs. 7-inch angle grinder. Now, it’ll be a piece of cake for you to decide which one to choose to take your carpentry skills to a whole new level!

Good luck and happy grinding!