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18V Grinder (Tool Only)


18V Grinder (Tool Only)


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.

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  • This tool is backed by the industry’s only lifetime service agreement, simply register within 90 days of purchase for free parts, free service for life.
  • This RIDGID 18V grinder features a load level LED Indicator-LED illuminates to prevent grinder overload
  • Tool-less guard design- easily rotates guard for optimal grinding position
  • 100-Percentage compatible with all RIDGID 18V slide battery packs
  • 18 volt grinder features hex grip- grip enhancing micro-texture provides superior grip and comfort during extended use
  • Spindle lock- to easily change grinding wheels
  • Auto tool lock-off- to prevent accidental start, if battery is installed while tool is locked on, the tool will not operate
  • Batteries and charger sold separately, this item works with these batteries (AC840083, AC840085, AC840084 and AC46182) and chargers (AC470013 and AC840093)


Arbor Size 5/8
Assembled Depth 13.464 in.
Assembled Height 6.614 in.
Assembled Width 5.039 in.
Battery Power Type Lithium Ion
Battery Size Lithium Ion
Battery charge time 30 min.
Certifications and Listings 1-UL Listed
Manufacturer Warranty Lifetime Service Agreement with Registration
Maximum Speed (rpm) 9000
Power Tool Product Type Cordless
Product Depth 17 in.
Product Height 6 in.
Product Weight 4.5 lb.
Product Width 5 in.
Returnable 90-Day
Side Handle Yes
Spindle Lock Yes
Variable Speed No
Voltage (volts) 18V
Wheel Diameter 4.5 in.
18V Grinder (Tool Only) is rated 3.7 out of 5 by 14.
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Rated 5 out of 5 by from Very powerful cordless grinder! The first time I used this grinder I was blown away by the power that it had being operated off of a battery. I’ve only used this grinder so far to cut through thin metal and sharpen lawn mower blades but it has done so flawlessly. It’s very easy to operate and change out cutting//grinding wheels. With a large Rigid battery it has a very long run time. I highly recomend this grinder for residential use!
Date published: 2019-01-06
Rated 4 out of 5 by from Quality battery grinder, great for quick, light grinding/cutting work I'm an Install Manager for a building supply company where I'm in charge of several turn-key trade accounts, primarily for windows, doors, and trim. Several times a week I have to pull out tools to perform minor punch work, so I selected a bundle of Rigid tools to keep behind the seat of my extended cab truck for such occasions. I use this grinder to quickly trim nails, deep sand/shape wood, and occasionally to dress up concrete. For these purposes, the tool performs excellent. Pros: Ergonomically designed. I specifically sought to add this tool to my kit as opposed to a corded, cheaper grinder because of its ergonomic grip. I don't have large hands, and I've used some corded grinders with bulky grips and I feared I'd loose my grip after long periods of use. The grip on this tool is well suited for easy gripping power. Toolless blade guard. In the past I've found blade guards a hindrance, but this guard can be adjusted easily without the use of tools. It rotates all the way around the blade, and can be turned in such a way to protect a thin blade while the tool bounces around in my toolbox. Cutting power is good for light duty work (see below) and speed is sufficient. Works great to shape wood when used with a course grit sanding pad. Cons: Blade is slower to start than some other grinders I've used, probably by a second or two to reach top RPM. I was worried about the RPM speed being less than some corded models, but I've not really noticed it affecting my work. Overall power is just not that of a corded grinder. I've only used this tool once or twice to try and cut concrete (the little bit of concrete work I've done with it is to dress up edges or grind down small imperfections, points where the tool has done fine), and it's done the job but slowly and the battery drains quickly. I wouldn't recommend this tool if you plan on cutting concrete regularly. It's better suited for light duty cutting. Cost. Corded grinders are much less expensive than this one, have more power and speed. Overall, great tool for light duty work. I appreciate being able to leave this tool set up with a blade ready for use and grab to use quickly when needed. Pleased with my purchase.
Date published: 2017-10-28
Rated 5 out of 5 by from This tool works great I am very impressed with this tool has a lot of power would recommend it
Date published: 2017-10-08
Rated 3 out of 5 by from I like the tool... hate the trigger. I have owned this tool for a little over a month. It was bought for the purpose of cutting 1/8 inch metal plates, chain link fence, grout, tile and all kind of other things. It does shut down if you use too much force but if you pace yourself it cuts fine. The thumb trigger can be difficult to use after an exhausting day. It does eat batteries so plan on getting a pack of 4.0 amp batteries. Overall I'm satisfied and it has definitely become my go to tool.
Date published: 2016-06-22
Rated 5 out of 5 by from Not far behind DeWalt I was very unsure about buying this grinder after seeing the reviews, but I am glad I bought it. I used a 20V Max grinder for a few days cutting steel angles for fire doors. This grinder can actually keep up with the performance of the DeWalt, and I am impressed! I like the gradual startup and LED load indicator, two features which the DeWalt did not have. Overall very impressed and would recommend this tool.
Date published: 2016-04-17
Rated 1 out of 5 by from 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.
Date published: 2015-11-13
Rated 2 out of 5 by from 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 !
Date published: 2015-07-29
Rated 2 out of 5 by from 250 bucks by the time you buy an X4 battery set. I was not happy when it only ran for 7 minutes on the batteries that came with my drill and driver. I like Ridgid because of the lifetime warranty on batteries and products. I bought two X4 batteries on sale for 80 bucks each (20 minute run time with those) and was quite unhappy when they were not under the lifetime service agreement. Uuhg---And the bigger batteries are heavy and awkward. I have used other brands of cordless grinders and liked them better, but you know, once you pick a brand, it makes sense to stick with it. ----this is not my favorite Ridgid product.
Date published: 2015-02-15
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is there a corded version of this grinder

Asked by: cwink55
Yes but has wider wheel
Answered by: aferg89
Date published: 2017-09-06

trying to register

it registers the item as a "jigsaw" and the r86040 model number tells me its invalid
Asked by: robr
I believe there's an a at the end of the #'s.
Answered by: Fiberbuilder
Date published: 2017-09-06

Can this be used as a masonry cutoff tool?

Can this tool be used with a masonry (stone, tile, granite) cutoff wheel to trim a 1/4 in. thick stone backsplash? If so, what is the recommended cutoff wheel?
Asked by: Greg
No, the R86040B is a metal grinder , and is designed for use in the grinding of metal. Use on masonry (stone, tile, granite) could damage the tool, as well as voiding its warranty. Thank you RIDGID
Answered by: RIDGID
Date published: 2017-09-06

Does Ridgid R86040 have brush or brushless motor? If It is brush motor then how to replace the carbon brushes? thank you so much

Asked by: kengusi85
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