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Model # R86040B

Internet # 203930490

Store SKU # 1000015874

X4 18-Volt Lithium-Ion Cordless 4-1/2 in. Angle Grinder

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

$99.00 /each
  • Spindle lock lets you easily change grinding wheels
  • 100% compatible with all RIDGID 18-Volt slide battery packs
  • Superior grip comfort




Model # R86040B

Internet # 203930490

Store SKU # 1000015874

The RIDGID X4 18-Volt Cordless Angle Grinder (Console Only) is compatible with all 18-Volt slide battery packs and features a tool-less guard design to easily rotate the guard for optimal grinding. With console-only tools, you have the option to add on to existing kits to create your own. The grinder features innovative Hex Grip micro texture to ensure comfort during extended use, and a load level LED light protects the grinder by preventing overload. With the convenient cordless design, it easily reaches tight spots without hassle. Backed by RIDGID's lifetime service agreement, you can count on free batteries, free parts and free service for the entire life of your tool.

  • Includes R86040 angle grinder, side handle, spanner wrench, wheel guard, grinding wheel, flange, clamp nut and operator’s manual
  • Load level LED indicator light illuminates to prevent grinder overload
  • Tool-less guard design easily rotates guard for optimal grinding position
  • Auto tool lock-off feature prevents accidental start; if battery is installed while tool is locked on, tool will not operate
  • Hexgrip micro texture provides superior grip and comfort during extended tool use
  • Batteries and charger sold separately; works with these batteries (AC840083, AC840085, AC840084 and AC46182) and chargers (AC470013 and AC840093)
  • Lifetime service agreement with registration within 90 days of purchase

Info & Guides

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Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Wheel Diameter (in.) 
4.5 in 
Amperage (amps) 
Arbor Size 
Batteries Included 
Battery Amp Hours 
Battery Power Type 
Lithium Ion 
Battery Size 
Lithium Ion 
Charger Included 
Color Family 
Cordless Tool Type 
Angle Grinder 
Grinding Wheel Included 
Maximum Speed (rpm) 
Number of Batteries Included 
Power Tool Features 
Adjustable Handle Position,Grinding Wheel Included,Spindle Lock 
Power Tool Product Type 
Product Weight (lb.) 
4.5 lb 
Side Handle 
Spindle Lock 
Tools Product Type 
Power Tool 
Variable Speed 
Voltage (volts) 
Warranty / Certifications
Certifications and Listings 
1-UL Listed 
Manufacturer Warranty 
Lifetime Service Agreement with registration within 90 days of purchase 


Rated 4.1 out of 5 by 37 reviewers.
Rated 1.0 out of 5.0 by Does not hold up I have had all Ridgid tools for over 12 years. So I was so happy when they finally came out with a grinder, only to be disappointed, It stopped working the first time I used it. I took it all the way to service center (Pain finding one that will honer Ridgid) they had it a month. I got it back, It worked for a day, then same thing... just quit working! I only used it for cutting off nails or thin steel angle. November 13, 2015
Rated 2.0 out of 5.0 by Tool started out good but torque is a let down ! I have 18 different Ridgid tools in electric and battery operated not counting batteries and chargers. The 18v grinder is fine for very light hobby shop work but is a major let down for anything heaver due to low torque. the unit continually kicks out during heavy grinding or light cutting, which I know is not recommended but come on guys. Really ! July 29, 2015
Rated 1.0 out of 5.0 by the built in protections keep this tool from doing real work This tool will suck a newly charged battery down so hard and so fast ,that it will cut out and you have to wait for it to reset itself, 5 or 6 times cutting of a piece of 1 inch by 1/4 inch flat bar,which took 7 or 8 minutes. I have 4 batteries , 2 large and 2 small and it does it with all of them. My large drill, reciprocating saw, circular saw will do the same thing if you are working them hard. The grinder is useless for what it is intended , which is cutting or grinding in areas at heights or where corded tools are unwieldy. it is definitely not going to wear out , ever, because you couldn't do enough real work with it to harm it. It is easy to warranty for life if you engineer protections into them that won't let the tool work hard.. I have a dozen rigid cordless tools and I am going to switch to Dewalt ,Milwaukee , or Makita in the near future.. If you make your living with your tools, be warned January 31, 2015
Rated 5.0 out of 5.0 by Amazing Tool I've fallen in love with this Grinder it does exactly what I expected it to do and also lasted longer than I thought it would. Its great in tight places, being cordless is great because usually I just need the grinder for a second to cut a nail or something in a renovation and not having to deal with power strips is great. more time on the job. November 25, 2014
Rated 5.0 out of 5.0 by Compact, moderate power A bag would've been nice like what's included with the corded model but the convenience of a grinder this compact and cordless is really nice. It's not as powerful as a corded model but it will push through what you throw at it as long as it's not overloaded. Standard battery lasts 15-25 minutes constant load. November 24, 2014
Rated 4.0 out of 5.0 by Great tool to have This grinder has plenty of power and has saved me many times. I use this tool mostly for fabricating and installing stainless steel equipment. The only problem I have with it is the switch placement. I would say this is a must have tool. November 24, 2014
Rated 5.0 out of 5.0 by Great Grinder I love this thing. It has the same power as a corded grinder but I can carry it around as needed. December 2, 2014
Rated 5.0 out of 5.0 by Good grinder to have Grinder starts slow, must be so as not to kick out overload. After that it works great. Is not super powerful, and will not replace your corded grinder, but great for the small quick jobs. Also has a locking trigger, which is a nice touch. As powerful as any of the other cordless grinders out there. November 27, 2013
  • 2015-11-26 T11:17:00.605-06:00
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