Rated 4.0 out of 5 by 51
Rated 1.0 out of 5.0 by daysofcoleco 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 CKwhynot 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 tool not enough power at all
July 31, 2010
Rated 1.0 out of 5.0 Would not recommend.
I used this for a grand total of about 3 hours before the trigger started malfunctioning now it is dead and since I am past the 90 day exchange period I am stuck trying to get it repaired somewhere and the closest place is more than 50 miles away.
No out of the ordinary use for a grinder and the thing lasts for 3 hours before dieing. It is one thing for a company to make a cheaper product but I expect more from Ryobi in the quality area and in the service area. I would not recommend buying one of these.
May 25, 2015
Rated 4.0 out of 5.0 by Proengman 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 hawk 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 5.0 out of 5.0 by lewelsvc 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 3.0 out of 5.0 by dsgnstr 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.
August 13, 2010