Model # P421

Internet #100519983

Store SKU #152332

Ryobi ONE+ 18-Volt 4-1/2 in. Angle Grinder (Tool-Only)
0033287139576

Ryobi

ONE+ 18-Volt 4-1/2 in. Angle Grinder (Tool-Only)

  • Over 50 great ONE+ tools work with the same 18V battery platform
  • Any 18V ONE+ blue or green tool works with any 18V ONE+ battery
  • Up to 6,500 RPMs enable fast and precise work
$39.97 /each

Frequently Bought Together

Product Overview

Ryobi Hero
Feature 1

Use the same 18V battery platform on over 70 great ONE+ tools

Feature 2

GripZone overmold gives you a more comfortable grasp on the tool

Feature 3

Tool-less clamp makes guard adjustments easy

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VOLTAGE

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18 VOLTS

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max speed

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6,500 rpm

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BATTERY PLATFORM

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ryobi one+

NI-CD & LI-ION

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Warranty

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3 year

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free shipping

On power tool and accessory orders over $45

The Ryobi 18-Volt ONE+ 4-1/2 in. Angle Grinder offers cordless convenience and the power of 6500 RPM for fast and precise work. This tool offers a host of user-friendly features, such as onboard wrench storage, a comfortable overmolded grip and a 3-position side handle to help reduce fatigue. It also has an intuitive trigger switch.

California residents: see   Proposition 65 information

Info & Guides

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Name 5.5-Amp Angle Grinder ONE+ 18-Volt 4-1/2 in. Angle Grinder (Tool-Only) 7.5 Amp 4.5 in. Corded Angle Grinder 6.5-Amp Angle Grinder
Brand Ryobi Ryobi Ryobi Ryobi
Ratings (102) (244) (16) (58)
Cordless/ Corded Corded Cordless Corded Corded
Wheel Diameter (in.) 4.5 4.5 in 4.5 4.5
Power Tool Features No Additional Features Adjustable Handle Position,Grinding Wheel Included,No Additional Features,No Tool Wheel Change,Spindle Lock Adjustable Handle Position,Grinding Wheel Included,Lock On Switch,Spindle Lock Adjustable Handle Position,Grinding Wheel Included,Spindle Lock
Amperage (amps) 5.5 0 7.5 6.5
Reconditioned No No No No
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Customer Questions & Answers

Will this grinder work to cut metal?

My question refers to the 4 1/2 in Angle Grinder.
Asked by: George
Very light use only. This thing overheats after a couple of minutes. I consider it useless.
Answered by: PetetheEngineer
Date published: 2016-12-19

does the grinding wheel come with the grinder?

Asked by: bootsy
yes
Answered by: gumbygold
Date published: 2015-09-20

Can i use this to sharpen tools

I'm new to using an angel grinder. Can I use it to sharpen my axe and lawnmower blade?
Asked by: T808
Yes and it works VERY well for that purpose. I use mine to sharpen my ax's, machetes, scythes lawnmower blades etc. I suggest using a flap sanding disk for that purpose.
Answered by: Dkeith45
Date published: 2017-01-11

Can i use a flap disc?

Asked by: goofy
Yes I use them often
Answered by: Dirtbag
Date published: 2017-03-17
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Customer Reviews

ONE+ 18-Volt 4-1/2 in. Angle Grinder (Tool-Only) is rated 4.3 out of 5 by 241.
Rated 5 out of 5 by from They were surprised at the store that I didn't take a different accessory in Ryobi's special deal... They were surprised at the store that I didn't take a different accessory in Ryobi's special deal: buy the drill, get a second bare tool for free, but I took the grinder to help cut a stubborn lock off a shed and it worked great. I need to cut some chain link fence and this will allow me to do so without investing in the world's longest extension cord. Nice, fairly light, easy to add a flap disk, cut-off disk or grinder stone and with the built-in spanner, I don't have to go hunting for it. The grinder saved me from getting a locksmith and waiting for hours and made short work of a stainless steel lock.
Date published: 2017-01-31
Rated 1 out of 5 by from Not a fan of this Ryobi product. I am a contractor and do not expect a cordless grinder to compet... Not a fan of this Ryobi product. I am a contractor and do not expect a cordless grinder to compete with corded or professional cordless model. When using this with a fully charged 4ah battery it will not cut through 14ga thin wall mild steel tubing using a thin 1/16" cutoff disk. You cannot cut through without the tool switching off mid cut ,even when using nearly no pressure on the tool. The tool doesn't bog down it just cuts the current to the motor as if it has an internal current protect feature. This is on the first cut. I bought this tool to have in the truck to cut 20' stock in half when I need one or two pieces of steel from the stock yard and don't want to bring a trailer. Ryobi is letting me down with it's recent line of lesser duty tools. Got a 5 tool combo kit at Christmas that all the tools were all toy grade not like the Ryobi drills and saws-all that I purchased individually. I switched to Ryobi when Hitachi started doing the same thing with its 18v line. I hope this is not the case with Ryobi. The reviews I read before purchase are in no way accurate. I think most of the positive reviewers are using this tool in a sanding/ polishing and surfacing operations.
Date published: 2017-02-24
Rated 4 out of 5 by from Goes through batteries fast, but definitely a great tool. Super happy I bought it Goes through batteries fast, but definitely a great tool. Super happy I bought it
Date published: 2016-11-02
Rated 5 out of 5 by from I bought this grinder because I had some baseboards to cut and install at my fathers house. I wen... I bought this grinder because I had some baseboards to cut and install at my fathers house. I went with the battery powered version because I have a bunch of the big Ryobi batteries already. This grinder is a little less powerful than the corded version but works great! I was able to easily cut through the baseboards with no hassle. It never felt like it was bogging down as long as you let the grinder take the lead and do the work. Don't force it. Nice clean cuts and the tool in the handle was a real bonus. Also, it was very easy to remove the handle and guard if needed. I'm happy to have added this to my Ryobi collection.
Date published: 2017-04-06
Rated 5 out of 5 by from Great for the price... Great little tool and works perfect for cleaning up my mower blades. Good quality as far as i can tell and will get extensive use when i start welding. The only complaint i have and should've probably double checked the manual before writing this, is no low voltage cut off and could get interesting if you're busy grinding away and the battery starts to fall on its face. No biggy really just a matter of keeping an ear out for power drop off. For the price I'd buy it again and definitely worth running the 4ah battery's with it for run time plus battery gauge to keep an eye on things. Meets my needs.
Date published: 2017-01-03
Rated 5 out of 5 by from This is an awesome Ryobi tool. BEST hand held grinder for medium duty around in my opinion. You c... This is an awesome Ryobi tool. BEST hand held grinder for medium duty around in my opinion. You can control it with one hand it easily. This makes it the perfect tool for trimming horses hooves. I use a paint stripping head for that purpose with the side handle and guard removed. It completely replaces the old farriers files I always hated using and the noise doesn't bother the horses much once they get used to it. I've also used it for grinding and cutting metal, wood, paint stripping etc. Wonderful tool.
Date published: 2016-11-11
Rated 5 out of 5 by from Getting a bad rap by some I didn't read through the reviews when I purchased this, it was more of an impulse buy when at the store. When I gave it a try cutting through pavers I thought it was defective, as the new 2.0 amp batteries I had were both dead after very very limited use. I picked up a 4.0 amp P108 battery and this grinder is AWESOME. I've made plenty of cuts without issue. As with any grinder don't try and force it to work faster than it should by applying excess pressure as that will shorten battery use time and cause it to get hot. On a side note: Wear Goggles when using, don't be a Cowboy. At first I wore safety glasses and still managed to get a small but quite painful piece of stone in my eye. Goggles are a must.
Date published: 2016-07-24
Rated 5 out of 5 by from High quality and unexpensive RYOBI cordless tools get proffesional work done I have been doing commercial HVAC since mid 2010 and I have used this grinder ever since. The grinder is not as fast as my corded Dewalt. But, in reality, no cordless grinder is going to be as fast as a corded one (regardless of brand name). However, this cordless RYOBI grinder gets the job done. It's supposed to be a DO-IT-YOURSELFER tool, but as a professional HVAC installer, I have used this grinder for professional uses. I have built ductwork in new hospitals, schools, apartment buildings, and super stores (a couple WALMARTS). I would recommend this Ryobi grinder (and any other Ryobi cordless tool) to DO-IT-YOURSELFERS and professionals as well.
Date published: 2014-01-28
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