Model # P421

Internet #100519983

Store SKU #152332

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

Ryobi

18-Volt ONE+ 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
Was  $39.97
$2997 /each

Save $10.00 (25%)

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Frequently Bought Together

Product Overview

  • 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
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.

Product Overview

  • 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
Model #: P421
Sku #: 152332
Internet #: 100519983

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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Price
Was $39.97
$29.97 /each
Save $10.00 (25%)
$29.97 /each
$39.97 /each
$39.97 /each
Name 18-Volt ONE+ 4-1/2 in. Angle Grinder (Tool-Only) 5.5-Amp Angle Grinder 7.5 Amp 4.5 in. Corded Angle Grinder 6.5-Amp Angle Grinder
Brand Ryobi Ryobi Ryobi Ryobi
Ratings (377) (128) (42) (60)
Reconditioned No No No No
Amperage (amps) 0 5.5 7.5 6.5
Power Tool Features Adjustable Handle Position,Grinding Wheel Included,No Additional Features,No Tool Wheel Change,Spindle Lock No Additional Features Adjustable Handle Position,Grinding Wheel Included,Lock On Switch,Spindle Lock Adjustable Handle Position,Grinding Wheel Included,Spindle Lock
Cordless/ Corded Cordless Corded Corded Corded
Wheel Diameter (in.) 4.5 in 4.5 4.5 4.5
Voltage (volts) 18
View Product View Product View Product View Product

Specifications

Dimensions

Product Depth (in.)
13.701
Product Height (in.)
5.443
Product Width (in.)
5.669
Wheel Diameter (in.)
4.5 in

Details

Amperage (amps)
0
Arbor Size
5/8 x 11 UNC
Batteries Included
No
Battery Amp Hours
0.0
Battery Power Type
Lithium Ion
Battery Size
Lithium Ion
Charger Included
No
Color Family
Green
Cordless Tool Type
Angle Grinder
Cordless/ Corded
Cordless
Electronic Speed Control
Yes
Grinder Switch Type
Trigger
Maximum Speed (rpm)
6500
Number of Batteries Included
0
Power Tool Features
Adjustable Handle Position,Grinding Wheel Included,No Additional Features,No Tool Wheel Change,Spindle Lock
Product Weight (lb.)
6.18lb
Reconditioned
No
Returnable
90-Day
Tools Product Type
Power Tool
Variable Speed
No
Voltage (volts)
18

Warranty / Certifications

Certifications and Listings
1-UL Listed
Manufacturer Warranty
3 Year Limited Warranty

Specifications

Dimensions

Product Depth (in.)
13.701
Product Height (in.)
5.443
Product Width (in.)
5.669
Wheel Diameter (in.)
4.5 in

Details

Amperage (amps)
0
Arbor Size
5/8 x 11 UNC
Batteries Included
No
Battery Amp Hours
0.0
Battery Power Type
Lithium Ion
Battery Size
Lithium Ion
Charger Included
No
Color Family
Green
Cordless Tool Type
Angle Grinder
Cordless/ Corded
Cordless
Electronic Speed Control
Yes
Grinder Switch Type
Trigger
Maximum Speed (rpm)
6500
Number of Batteries Included
0
Power Tool Features
Adjustable Handle Position,Grinding Wheel Included,No Additional Features,No Tool Wheel Change,Spindle Lock
Product Weight (lb.)
6.18lb
Reconditioned
No
Returnable
90-Day
Tools Product Type
Power Tool
Variable Speed
No
Voltage (volts)
18

Warranty / Certifications

Certifications and Listings
1-UL Listed
Manufacturer Warranty
3 Year Limited Warranty

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: 2017-08-03

Can I cut off a lock w/ grinder.

It's a round lock from my storage. The kind that has little room to cut
Asked by: Bob
Thank you for asking, Bob. Yes, you are able to cut a lock off with this grinder. I hope this helps and we appreciate your interest in Ryobi! -Keri
Answered by: Ryobi Tools Team
Date published: 2017-08-24

Can't use diamond masonry blade?

I think I'm hearing this grinder can't/shouldn't be used with a masonry blade. I want to score bricks for cutting. Will this grinder do that? Thank you.
Asked by: MMBill
It certainly can and has no problem cutting through brick pavers. I don't think it's intended for that though. The battery goes pretty quick doing so.
Answered by: Chris
Date published: 2017-07-27

does the grinding wheel come with the grinder?

Asked by: bootsy
yes
Answered by: gumbygold
Date published: 2017-07-27
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Customer Reviews

18-Volt ONE+ 4-1/2 in. Angle Grinder (Tool-Only) is rated 4.3 out of 5 by 377.
Rated 4 out of 5 by from A little bit of buyer beware should be mentioned with this tool. I don't like to write reviews, ... A little bit of buyer beware should be mentioned with this tool. I don't like to write reviews, but maybe I can help somebody else out in the future. As a few others have noted, this thing will chew through batteries. I've stuck with Ryobi for all my battery operated tools as I think they're a great value for the price. I needed to make some specific cuts on some pavers I was laying in the backyard, so I bought this grinder. I've had two compact Lithium+ 1.5AH batteries (P107) which have been great, but this grinder ate them up. I got 5-7 min (at best) of real run-time before they were dead. I was also using a brand new Makita diamond blade. I bought a high capacity regular Lithium 2.4AH battery (P105) and the grinder chewed through that battery as well. I finally spent the extra money on the high capacity Lithium+ 4.0AH battery and that seemed to last about 15-20 min before it needed a charge. If you are using this for short projects, you will be fine, but if you plan on using this for a serious amount of cutting, then make sure you have enough batteries to get you through the project. I suppose this should be a no-brainier, but again, I wouldn't underestimate how much battery this thing needs. I've never had a battery issue with any other Ryobi tool. I want to give this 5 stars but I feel like there should be some sort of "battery disclaimer" on the box with a chart giving an estimated run-time with each battery.
Date published: 2017-07-26
Rated 5 out of 5 by from I'm heavily invested in the Ryobi One+ 18v system. I came to this page hoping to find an amp rati... I'm heavily invested in the Ryobi One+ 18v system. I came to this page hoping to find an amp rating for this device (which I didn't find), but figured I'd leave a review while I'm here. This grinder is incredible for the price. I wasn't expecting much from Ryobi when I bought my first One+ tool, but they continue to surprise me. At a recent job I needed to cut through 200 linear feet of asphalt, and having forgotten my circular saw, and having no other options, I decided to give this thing a try. It did it. I was only able to cut just shy of 2" deep with it, of course, but it was enough to break the asphalt off, and break it off clean. I managed this job on 5, 4ah batteries. The lithium+ batteries make all the difference... the black batteries that come with some of these tools aren't worth powering more than their flashlights. Over the 200 feet of slicing through asphalt, the grinder got HOT... real hot... and I FULLY expected it to burn out at any minute, yet it never did; in fact, it still works as well as the day I bought it. Great tool.
Date published: 2017-06-09
Rated 4 out of 5 by from Just like everything else Ryobi currently makes, good build quality, WELL engineered, thoughtfull... Just like everything else Ryobi currently makes, good build quality, WELL engineered, thoughtfully designed, well balanced, versatile and a great value. I first bought Ryobi tools as badly needed and relatively inexpensive "temporary" replacements right after all of my other tools were destroyed in a fire, that was 15 years ago. I still have most of those very same tools today and they're still going strong. And the ones I don't have, well, I pretty much tortured them and they died not owing me a dime. Needless to say I've been pleasantly surprised by their longevity ESPECIALLY for the money I shelled out. As a professional contractor, I used to laugh at employees who had RYOBI tools. Well in the spirit of full disclosure, I'm not laughing any more! Well done RYOBI! Well done.... and PLEASE.... just stick to your "best tools for the money" business model because it's working! ~E. JAMES, Hanover NH
Date published: 2017-06-15
Rated 1 out of 5 by from Weakest grinder I have ever owned. I do a lot of metalworking and I bought this as a home tool for little tasks around the house. First off the best batteries Ryobi offer last about 3 to 5 minutes. Second it has very low torque, can't even keep a cut off wheel spinning while cutting 20 ga. sheet metal. Who tests these tools? I know Ryobi is a lower end brand but I expected a bit more. This grinder is useless. Ran thru 4 batteries to cut a 12" square out of a 20 ga. piece of galvanized sheet. JUNK DON'T BUY IT!!!
Date published: 2017-05-04
Rated 4 out of 5 by from Eats Batteries! I replaced the grinding wheel with a rough cut tile cutting wheel, and enlarged ... Eats Batteries! I replaced the grinding wheel with a rough cut tile cutting wheel, and enlarged the hole in the shower where the on/off/temperature handle comes through the tile. I did this for three showers, and completely drained two batteries. So, IMHO great for short and sweet jobs, but get the 110V one if you intend to do longer jobs. To be completely fair, I have no idea how much power the tile cutting wheel uses vs the regular grinding wheel.
Date published: 2017-05-10
Rated 5 out of 5 by from I already had other Ryobi tools and needed an angle grinder to cut through a tile wall for a proj... I already had other Ryobi tools and needed an angle grinder to cut through a tile wall for a project. I bought this tool and used the batteries I already had. It cut through the tiled wall with ease and left a clean cut. I used the recommended dust mask and eye protection as it does make a lot of dust. The battery lasted for al 8 cuts without bogging down. I used the One plus lithium battery. I used a Dewalt XP 450x diamond blade for the cuts.
Date published: 2017-06-07
Rated 1 out of 5 by from Eats batteries like crazy....would not recommend to anyone. Eats batteries like crazy....would not recommend to anyone.
Date published: 2017-06-28
Rated 3 out of 5 by from For some reason it keeps cutting out. I can get a couple minutes of use, then it shuts off. Eve... For some reason it keeps cutting out. I can get a couple minutes of use, then it shuts off. Even after a full charge, this battery operated angle grinder only lasts for a couple of minutes of steady grinding before it shuts down. I've tried other Ryobi 18V battery packs as well. It looks well made and feels good in the hands. Easy to adjust the handle and swap out discs. No problems with it right out of the box. However, once you start grinding and putting it to use, it falls short. I'm going back to my corded angle grinder which has never shut down or overloaded during use.
Date published: 2017-10-10
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