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Model # AG452K

Internet # 100529101

Store SKU # 840305

5.5-Amp 4-1/2 in. Angle Grinder

This item has been discontinued.
The Home Depot no longer carries this specific product.




Model # AG452K

Internet # 100529101

Store SKU # 840305

The Ryobi 4-1/2 in. Angle Grinder features a side handle that you can rotate left and right for three unique working positions. With this feature, you can easily use the grinder in a variety of applications. To even further accommodate the user, the grinder has an ergonomic handle with GripZone technology for steadiness and comfort.

California residents: see  Proposition 65 information

Info & Guides

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Product Depth (in.) 
18 in 
Product Height (in.) 
14 in 
Product Width (in.) 
5.5 in 
Wheel Diameter (in.) 
4.5 in 
Amperage (amps) 
Arbor Size 
5/8 -11 UNC 
Case Included 
Color Family 
Cord Length (ft.) 
Corded Tool Type 
Angle Grinder 
Grinding Wheel Included 
Maximum Speed (rpm) 
Power Tool Features 
Adjustable Handle Position,Spindle Lock 
Power Tool Product Type 
Product Weight (lb.) 
9.65 lb 
Side Handle 
Spindle Lock 
Tools Product Type 
Power Tool 
Variable Speed 
Warranty / Certifications
Certifications and Listings 
1-UL Listed,ETL Listed 
Manufacturer Warranty 
3 Year Warranty 


Rated 4.0 out of 5 by 51 reviewers.
Rated 1.0 out of 5.0 by nice try Ryobi I liked the design of this grinder. A 4 1/2 inch grinder with a trigger at a decent price is hard to find these days. Usually they have barrel bodies and switches close to the blade. This ryobi was light, easy to use and had a good feel. However, I bought it for repointing my brick house and went through two of them before I bought a much more expensive Milwaukee. On the plus side they have a 30 satisfaction guarantee and both grinders blew up before that expired. November 6, 2006
Rated 1.0 out of 5.0 by Brushes I bought this AG451K 4.5 grinder and in les than 1 day the Brushes went on it. I cut 2 boldts of a swing set 1"long by 3/8 thick. You tell me what good about this product? April 20, 2009
Rated 1.0 out of 5.0 by not enough power at all July 31, 2010
Rated 4.0 out of 5.0 by Impressive performance I'm a welder/metal fabricator and have used many grinders from various big name companies. I thought I'd give this grinder a shot because it's cheap compared to my other grinders I have. Performance and ergonomics on this grinder have won me over. I use it daily as a light duty grinder. Mostly deburring parts and knocking down small welds. It doesn't have the amperage needed to hog out bevels and flush out welds in a timely manner but is very capable of doing so. I have found it to be very sensitive to an abrasive wheels balance. If your abrasive wheel isn't quite balanced the grinder will vibrate quite a bit. I have had no issues using this grinder with cut off wheels. I actually prefer using it to cut with for the fact that it's lighter than my other grinders and it's lower amperage so it doesn't want to yank itself out of my hands if it starts to get wedged. Most impressive of all is that it has outlasted some of the more expensive big name grinders I have had the displeasure of owning and using. September 10, 2011
Rated 2.0 out of 5.0 by only for grinding and sanding unit has a nice feel but manual states only for grinding and sanding and not for cutting, Also manual states that only offset wheels can be used. When properly installed the strait wheels bought at Home Depot are loose, you can reverse the collet but manual says not to. February 24, 2013
Rated 3.0 out of 5.0 by RYOBI switch I have two of these and I love them. I fabricate ornamental iron as a hobby and use them almost every day for sanding, grinding, and slitter wheel cutting everything from I-beams to concrete, but mostly 16ga steel tube. I even run 7" diamond blades, slitters and sanding discs on both, but I have to be careful not to either overheat or overspeed them. I prefer to run them on speed controls, but I'm not sure the switch likes it. Sometimes run them at full speed until they were too hot to touch. I'm impressed. They're still going - one's 5yrs old, the other 1yr. The wrench in handle and snap on guard are great! The size and trigger switch on handle are great. The rotatable handle has not been used, although the tool has been used in all positions. I would rate it 5 STARS but for one thing. I'm about to buy the SWITCH for the 5th & 6th time! I'm about to replace it the third time on each! It's only $5, but the down time, the wait for order, and the dis/re-assembly get quite frustrating. RYOBI can you please upgrade the switch design a little? btw I did not use the last replacement switch with the speed control and it failed quickest! I recommend these all the time because they're SO economical, but always with that switch caveat. Thanks! August 13, 2010
Rated 5.0 out of 5.0 by Good hard working grinder I had the previous version of this grinder for six years. As a handyman It is used frequently. I finally burned it out after going through four 4" twisted wire brushes to grind the paint off a concrete block wall of a gymnasium. It took three days. I've used it for cutting the tops off fence posts, cutting metal, pointing walls and chimneys, cutting tile, sanding, cutting stone, and many other things. I love the control you get with the handle and trigger. You can work with it all day without getting tired. The key to using this or any other tool is let the tool do the work. Don't force it. You will remove more material faster by letting the tool run at speed and preserve the tool as well. If it starts to get hot either give it a rest or let it spin free to circulate air through it. The new one works just as great and has the advantage of the swiveling handle. With a slight modification of the old case and this one is back where it belongs. February 18, 2014
Rated 5.0 out of 5.0 by Felt right out of the box Just bought this grinder on a recommendation from a friend. I was pleasantly pleased when I used it. My last grinder purchase was based on motor amps, 7 amps, and name brand loyalty. This was less amps, 5.5, but a great product. 1) Ran much smoother and quieter ,than the one I returned. Sounds and feels like a good product should. 2) I like the feel of the pistol grip, that is can rotate is nice, but not that a big deal 3) Two year limited warranty is a nice plus 4)Comes with a case , a definite plus. DeWalts products usually came with cases, I guess cost cutting has eliminated that. 5) Wrench fits in handle, a nice plus, handy place to keep from loosing it. 6) Comes with a wire wheel and a cup sander, the other brands did not. I am a power plant mechanic so I know tools. September 13, 2010
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