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

California residents: seeProposition 65 information

Info & Guides

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Assembled Depth (in.)  13.7 in  Assembled Height (in.)  5.443 in 
Assembled Width (in.)  5.669 in  Product Depth (in.)  13.701 
Product Height (in.)  5.443  Product Width (in.)  5.669 
Wheel Diameter (in.)  4.5 in 
Amperage (amps)  Arbor Size  5/8 x 11 UNC 
Batteries Included  No  Battery Power Type  Lithium Ion 
Battery Size  Lithium Ion  Charger Included  No 
Color Family  Green  Cordless Tool Type  Angle Grinder 
Cordless/Corded  Cordless  Grinding Wheel Included  Yes 
Maximum Speed (rpm)  6500  Power Tool Product Type  Cordless 
Product Weight (lb.)  6.18 lb  Reconditioned  No 
Returnable  90-Day  Side Handle  Yes 
Spindle Lock  Yes  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 


Rated 4.2 out of 5 by 86 reviewers.
Rated 4.0 out of 5.0 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 4.0 out of 5.0 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 5.0 out of 5.0 by 18 volt angle grinder i really like the features on this angle grinder. The guard rotates without being removed and the grinder has plenty of power. October 29, 2014
Rated 5.0 out of 5.0 by Best bang for buck I use this for taking off paint and preping heavy metals and it works fantastically. How ever it isnt a corded grinder replacement. I also recommend the 4.0 batteries because it will consume the short packs in minutes. February 5, 2015
Rated 5.0 out of 5.0 by It'll get the job done It has enough power and battery life for sharpening mower blades and other stuff with the p108 lithium battery. I fully recommend the p108 lithium battery for any tool you want to have a power boost and if you need really long battery life. It has enough torque to cut good. Of course as with all battery tools it's not quite as good as 120 volt but it's close enough for a battery tool that I'll grab this any day for small jobs instead of dragging out a cord etc. January 20, 2015
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