Internet #100519983

Model #P421

Store SKU #152332

Store SO SKU #1000795627

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

  • Up to 6,500 RPM's enable fast and precise work
  • Includes: Side Handle, Grinding Guard and Wheel, Spanner Wrench
  • Over 175 ONE+ Tools – All Work With Any RYOBI ONE+ 18V Battery
  • See More Details
$4497

Frequently Bought Together

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Price:
$4497

Product Overview

18-Volt Battery Platform

18-Volt Battery Platform

No matter your interests or skill level, we can power it. With cordless lithium-ion technology, RYOBI can power you through all types of projects from drilling, driving, cutting, and fastening, to lighting, plumbing, cooling, and rocking, to trimming, edging, mowing, and clearing – and so much more.

World’s Largest 18V Tool System

World’s Largest 18V Tool System

RYOBI gives you the ultimate in versatility and selection to get the job done. From household tasks to the jobsite to recreation and everything in between, there is a ONE+ product for you.

RYOBI ONE+ Delivers More

RYOBI ONE+

RYOBI has never changed – and will never change – the 18V ONE+ battery platform, meaning our newest products & batteries fit the original RYOBI tools and batteries from 1996. RYOBI ONE+ is the system that delivers more.

Power Tools

Power Tools

Whether it’s a weekend DIY project or a full remodeling job, RYOBI ONE+ has you covered with all the tools you need to get the job done.

Lawn & Garden Equipment

Lawn & Garden Equipment

From trimming and edging, to mowing and clearing, knock out lawn care with one battery platform that does it all.

Air Tools

Air Tools

Make your next nailing, stapling, inflating, and deflating jobs a breeze with cordless air tools from RYOBI ONE+.

Lifestyle Products

Lifestyle Products

Enjoy our expansive lineup of lifestyle, craft, and specialty tools including audio equipment, lights, fans, vacuums, soldering irons, and much more!

RYOBI ONE+

RYOBI ONE+

Put the power of 18V ONE+ at your fingertips from the cordless system that delivers more.

18V Lithium

18V Lithium

Lithium-ion battery technology with fade-free power and Extreme Weather Performance to withstand the toughest conditions.

3 Year Limited Warranty

3 Year Limited Warranty

RYOBI Portable Power Tools and Bench/Stationary tools purchased on or after 1.1.11 are covered by a 3-year warranty.

World’s Largest

World’s Largest

The RYOBI 18V ONE+ System gives you the ultimate in versatility and selection.

100% Compatible

100% Compatible

All RYOBI 18V tools and batteries are 100% forwards and backwards compatible. Any RYOBI 18V tool works with any of our 18V batteries.

90 Day Guarantee

90 Day Guarantee

Buy with confidence with our 90 day no-risk satisfaction guarantee.

RYOBI introduces the 18-Volt ONE+ Cordless 4-1/2 in. Angle Grinder (Tool-Only). The 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, the comfortable GRIPZONE overmold, and a 3-position side handle to help reduce fatigue. It also has an intuitive trigger switch. Best of all, it is part of the RYOBI ONE+ System of over 175 Cordless Tools that all work on the same battery platform. Backed by the RYOBI 3-Year Manufacturer's Warranty, the 18-Volt ONE+ 4-1/2 in. Angle Grinder includes a side handle, a Type 27 grinding guard, a grinding wheel, a spanner wrench, and an operator's manual. Battery and charger sold separately.

Info & Guides

You will need Adobe® Acrobat® Reader to view PDF documents. Download a free copy from the Adobe Web site.

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18-Volt ONE+ Cordless 4-1/2 in. Angle Grinder (Tool-Only)
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BrandRYOBIMakitaMilwaukeeMakita
Name18-Volt ONE+ Cordless 4-1/2 in. Angle Grinder (Tool-Only)6 Amp Corded 4 in. Lightweight Angle Grinder with Grinding Wheel, Wheel Guard Side Handle Hard Case7 Amp Corded 4-1/2 in. Small Angle Grinder with Sliding Lock-On Switch7.5 Amp 4-1/2 in. Paddle Switch Angle Grinder
Price
$4497
$5400
$6497
$7900
Ratings
(1549)
(128)
(364)
(152)
Cordless/ CordedCordlessCordedCordedCorded
Wheel Diameter (in.)4.5 in4 in4.5 in4.5 in
Power Tool FeaturesAdjustable Handle Position,Grinding Wheel Included,No Additional Features,No Tool Wheel Change,Spindle LockGrinding Wheel Included,Lock On Switch,Second Handle Included,Spindle LockAdjustable Handle Position,Lock On Switch,No Tool Wheel Change,Spindle LockLock On Switch,No Tool Wheel Change,Second Handle Included
Amperage (amps)067 A7.5
Voltage (volts)18
Battery Amp Hours0.0
View ProductView ProductView ProductView 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
Battery/Charger
Tool Only
Battery/Charger
Tool Only
Charger Included
Charger Not Included
Color Family
Green
Condition
New
Cordless Tool Type
Angle Grinder
Cordless/ Corded
Cordless
Electronic Speed Control
Yes
Grinder Switch Type
Trigger
Maximum Speed (rpm)
6500
Motor Type
Brushed
Number of Batteries Included
0
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.)
6.18
Returnable
180-Day
Tools Product Type
Power Tool
Variable Speed
No
Voltage (volts)
18

Warranty / Certifications

Certifications and Listings
UL Listed
Manufacturer Warranty
3 Year Limited Warranty

Questions & Answers

91Questions53Answers

Is there a wire wheel accessory for this? I want to strip paint off a metal chair.

Asked by studiodad September 30, 2020
5
Answers

https://www.3m.com/3M/en_US/company-us/all-3m-products/~/Scotch-Brite-Roloc-Bristle-Disc/?N=5002385+3293223502&rt=rud

Does this come with battery?

Asked by Mary September 18, 2020
7
Answers

Hi Mary, Thanks for your question. The RYOBI 18-Volt ONE+ Cordless 4-1/2 in. Angle Grinder P421 is the grinder only. The battery and charger will need to purchased separately if necessary. - Eve

Will it Cut off wood as well as grind material?

Asked by Nabana September 2, 2020
6
Answers

I guess it will. But it will smoke alot and burn the wood you are cutting. It's really for cutting stone and metal.

What size arbor does it have?

Asked by Vic August 31, 2020
5
Answers

5/8 inch. No other adapter is included.

Can you use 7/8 arbor wheels, does it come with adapter?

Asked by Angel August 19, 2020
5
Answers

Adapters for 7/8" are usually supplied with 7/8" to get them down to 5/8". You can purchase adapters separately if needed.

Will this grinder work with the 3 Ah battery I have

Asked by mm August 5, 2020
1
Answer

Hello MM, Yes this RYOBI P421-P163 18-Volt ONE+ Cordless 4-1/2 in. Angle Grinder with 2.0 Ah Battery and Charger Kit will work with the RYOBI 3 Amp Hr. Battery. Thanks for asking. - Eve

Can this grinder grind a tree stump down 1 ft?

Asked by Nora July 19, 2020
5
Answers

not made for that type of grinding

Can I purchase a type 1 guard and flange for this grinder?

Asked by Rex July 8, 2020
4
Answers

The guard is removable.

what size disks

Asked by kegham June 10, 2020
9
Answers

5/8 inch arbor...center hole.

will it hold a wire wheel cup? 5/8" arbor?

Asked by roccocon May 24, 2020
6
Answers

Hi roccocon! Thank you for your question and interest in our product. This grinder can use wire brushes. The arbor size is 5/8 x 11 UNC.

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

Customer Reviews

  • 1550 Customer Reviews
  • 4.5 out of 5 stars overall
90% of customers recommended.
Overall Ratings
5star-icon(1026)
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2star-icon(42)
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Good product, does what it is supposed to do and has a consistent quality with other Ryobi produc...
Good product, does what it is supposed to do and has a consistent quality with other Ryobi products. Had to make a quick purchase and this fit the purpose. It will come in handy in the future.
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1
0
Its great when you disabled
Its great when you disabled
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1
0
Very handy i like it.
Very handy i like it.
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0
0
Works Great Cut the cord and enjoy the freedom to be portable The adjustable shield is great defl...
Works Great Cut the cord and enjoy the freedom to be portable The adjustable shield is great deflect it the way you want it came with a grinding wheel I installed a cut off wheel, wire brush for rust removal This tool works Great The wrench also fits into the handle so you do not misplace it
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1
0
Price is good, grinder works fine. Will recommended
Price is good, grinder works fine. Will recommended
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5
0
Works really well! I have been cutting all the sorts of metals and this tool has made the process...
Quality :
5
Value :
5
Works really well! I have been cutting all the sorts of metals and this tool has made the process easy. If you are in need of a grinder, this is an amazing one! I just did cuts in my fence to create a little gate and it worked beautifully!
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5
0
The price was too low to pass up. Turns out it's a great tool with enough power to do every job I...
Quality :
5
Value :
5
The price was too low to pass up. Turns out it's a great tool with enough power to do every job I've thrown at it. Another impressive tool from Ryobi.
Was this helpful?
1
0
Great tool for DIYers
This is a nice angle grinder that has plenty of power for the smaller jobs. Great for a DIYer or hobbyist but not sure it can handle the constant use by a professional. Still high quality for the price point.
Was this helpful?
3
0
This angle grinder is pretty handy. No need for long extension cords. The wrench stores in the ha...
This angle grinder is pretty handy. No need for long extension cords. The wrench stores in the handle so it's always where you need it. The safety button and trigger are a little touchy, sometimes I have to adjust my grip to get it to work, might just be mine. It is much slower than my corded grinders and it goes through batteries really quick. I have 3 of the p100 batteries that come with the cheaper drill combo packs. Went through all of those batteries making less than 100 cuts on 1/4 round stock. Would highly suggest a 4ah battery, or 2. I will mostly use it with a wire wheel to clean up flux core welds. Maybe a couple cuts on thin material. Overall it is still worth the money.
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6
0
Don't buy
This thing isn't very good. I bought it to grind old paint off concrete block basement wall, battery dies after 3 or 4 blocks. And you can't get the tool flat on the working surface cause of how the battery sits. Buy an electric one for concrete work.
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