Ryobi 18-Volt ONE+ 4-1/2 in. Angle Grinder (Tool-Only)-P421 at The Home Depot


Model # P421

Internet # 100519983

Store SKU # 152332

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

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

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

$39.97 / each
  • 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

Internet # 100519983

Store SKU # 152332

The Ryobi 18-Volt ONE+ 4-1/2 in. Angle Grinder offers cordless convenience and delivers a powerful 6,500 RPMs for fast and precise work. Compatible with the Ryobi 18V ONE+ system, this tool offers a host of convenient features, including an onboard wrench storage. A comfortable overmolded grip and 3-position side handle help reduce fatigue. A 4-1/2 in. grinding wheel is included for added value and convenience.

California residents: seeProposition 65 information

Info & Guides

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Amperage (amps)  Arbor Size  5/8 x 11 UNC 
Assembled Depth (in.)  13.7 in  Assembled Height (in.)  5.443 in 
Assembled Width (in.)  5.669 in  Batteries Included  No 
Battery Power Type  Lithium Ion  Battery Size  Lithium Ion 
Certifications and Listings  1-UL Listed  Charger Included  No 
Color Family  Green  Cordless Tool Type  Angle Grinder 
Cordless/Corded  Cordless  Manufacturer Warranty  3 Year Limited Warranty 
Maximum Speed (rpm)  6500  Power Tool Product Type  Cordless 
Product Depth (in.)  13.701  Product Height (in.)  5.443 
Product Weight (lb.)  6.18 lb  Product Width (in.)  5.669 
Reconditioned  No  Returnable  90-Day 
Side Handle  Yes  Spindle Lock  Yes 
Variable Speed  No  Voltage (volts)  18 
Wheel Diameter (in.)  4.5 in 


Rated 4.4 out of 5 by 73 reviewers.
Rated 4 out of 5 by Handy grinder I have used this grinder to sharpen my lawnmower blade wihout removing it from the lawnmower and it did a good job. I have also installed a steel cut off blade to cut through metal closet door hardware and it worked great. December 26, 2008
Rated 5 out of 5 by 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. January 28, 2014
Rated 4 out of 5 by Good tool for smaller jobs I have been using this tool to open up some cracks in my garage floor in order to fill them and resurface the floor. The tool is great and does its job with a decent diamond blade. However you NEED to buy the high capacity battery for it or else you only get about 5-10 minutes of real working time. Good tool, but chews up battery quick. For bigger jobs a corded tool is better, or dish out the cash for a high capacity battery. May 7, 2014
Rated 5 out of 5 by Great little grinder. I've used grindes a lot. I use to be a TIG welder back in the '70s and used a grinder a few hours every working day back then and still use them regularly these days. I've used this grinder maybe 20 times so far and ad usual with Ryobi its a great value. So far its had plenty of power ( using the 2x Lion batt ) seems well put together, the trigger and safty work welln easy to swap disc's and I love the lt green color of these tools, makes them easy to see on the job or in the box. I buy tools that are a good value for my regular use, Ryobi over the past 10 years has earned my first consideration when I'm shopping for a new tool. October 1, 2013
Rated 1 out of 5 by JUNK! Total piece of junk. used twice and the brushes melted through the plastic handle. Not satisfied. It isnt worth the $40 spent. When you try to warranty the tool it has to be sent off to service. What a joke! Should have went to Harbor Freight and spent $10 for a tool that at least would work for a longer time than this tool. November 7, 2014
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