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Model # R86042B

Store SKU # 1003910929

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18V Brushless Cordless 4-1/2 in. Slide Switch Angle Grinder (Tool Only)

$13090
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  • High Power Output with 10,000 RPM
  • Includes: Spanner Wrench, Grinding Wheel, and Side Handle
  • Free Parts and Service for Life with Registration
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Product Details

RIDGID introduces the R86042 18V 4-1/2 in. Slide Switch Angle Grinder (Tool Only). RIDGID’s brushless motor technology delivers maximum performance and longer runtime. The powerful brushless motor in this grinder delivers up to 10,000 RPM. This tool features an LED Overload Indicator to help extend motor life. The tool-free guard design allows users to easily adjust the position of the guard for decreased downtime and increased productivity. A 3-position Side Handle gives users optimal control and versatility on the jobsite while the ergonomic slim grip allows for maximum comfort during extended use. Lock-Off Protection prevents accidental starts; so if the battery is installed while the tool lock is on, the tool will not operate. As always, the RIDGID 18V 4-1/2 in. Angle Grinder is 100% compatible with all RIDGID 18V batteries. Best of all, this tool is backed by the industry’s best Lifetime Service Agreement, simply register within 90 days of purchase for FREE Parts, Free Service, For LIFE. The R86042 Brushless 4-1/2 in. Angle Grinder includes the grinder, a spanner wrench, type 27 grinding wheel, guard and a side handle. Batteries and charger sold separately.
  • Maximum Performance. Longer Runtime.
  • Pair with MAX Output batteries for maximum power
  • Powerful brushless motor delivers up to 10,000 RPM
  • LED overload indicator helps extend motor life
  • Tool-free guard design delivers increased productivity
  • 3-position side handle provides optimal control and versatility
  • Ergonomic slim grip for maximum comfort during extended use
  • Lock-off protection prevents accidental starts. If the battery is installed while the tool lock is on, the tool will not operate.
  • 100% Compatible: Works with all RIDGID 18V Batteries and Chargers
  • Lifetime Service Agreement with registration within 90 days of purchase
  • Includes: R86042 18V Brushless 4-1/2 in. Angle Grinder, spanner wrench, type 27 grinding wheel, guard and a side handle
  • Battery and charger sold separately
  • RIDGID: Build for a Lifetime
  • Click Here to Shop All RIDGID Products






  • Click here for more information on Electronic Recycling Programs
  • Return Policy
  • California residents

Additional Resources

From the Manufacturer

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Specifications

Dimensions: H 6.06 in, W 5.04 in, D 13.46 in

Dimensions

Product Depth (in.)13.46 inProduct Height (in.)6.06 in
Product Width (in.)5.04 inWheel Diameter (in.)4-1/2 in

Details

Amperage (A)0.0 AArbor Size5/8
Batteries IncludedNoBattery Amp HoursNo Battery
Battery Power TypeLithium IonBattery Size18-volt
Battery/ChargerTool OnlyCharger IncludedCharger Not Included
Color FamilyOrangeConditionNew
Cordless Tool TypeAngle GrinderCordless/CordedCordless
Electronic Speed ControlNoGrinder Switch TypeSliding Switch
IncludedGrinding Wheels, Second HandleMaximum Speed (RPM)10000 RPM
Motor TypeBrushlessNumber of Total Batteries Included0
Power Tool FeaturesAdjustable Handle Position, Lock On Switch, Spindle LockProduct Weight (lb.)5 lb
Returnable90-DayTools Product TypePower Tool
Variable SpeedNoVoltage (V)18 V

Warranty / Certifications

Certifications and ListingsUL ListedManufacturer WarrantyLifetime Service Agreement with registration within 90 days of purchase
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Questions & Answers

56Questions
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Q:what battery do I use for R86041
by|Oct 5, 2023
2 Answers
Answer This Question

A:  Trips out with smaller battteries with very little preassure. Use at least a 3 am hour battery and its a great tool

by|Nov 19, 2023

    A:  Hello, Steev - Thank you for your question. The R86041 is compatible with all RIDGID 18v Lithium Ion batteries. I hope this helps! Additionally, if you need further support, then a RIDGID Customer Experience Professional is here for you, Monday - Friday from 9 am to 6 pm (EST) when you call or text us at 1.866.539.1710 or through email or live chat when you visit us at https://register.ridgidpower.com/contact. And thank you again for your interest in the 18V Brushless Cordless 4-1/2 in. Slide Switch Angle Grinder (Tool Only). - Jewel

    by|Oct 12, 2023
      caret
      Q:Why does the product description say "Cut-off wheel" but the manual says... "Operations such as cutting-off are not recommended to be performed with this power tool. Operations for which the power tool was not designed may create a hazard and cause person
      by|Aug 15, 2023
      1 Answer
      Answer This Question

      A:  Hello, Ridgidpete - Thank you for your question. The angle grinder is only recommended for; Grinding metals. Sanding wood or metal surfaces (sanding disc and pad not included). Wire brushing metal surfaces (wire wheel not included). Polishing metal surfaces (pad and bonnet not included). I hope this helps! Additionally, if you need further support, then a RIDGID Customer Experience Professional is here for you, Monday - Friday from 9 am to 6 pm (EST) when you call or text us at 1.866.539.1710 or through email or live chat when you visit us at https://register.ridgidpower.com/contact. And thank you again for your interest in the 18V Brushless Cordless 4.5 in. Angle Grinder Kit w/Grinding Disc, Cut-Off Wheel, 4.0 Ah Battery, and Charger. - Jewel

      by|Aug 17, 2023
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        Q:is the switch one better then the paddle one
        by|Jun 19, 2023
        3 Answers
        Answer This Question

        A:  Yes 

        by|Jun 20, 2023

          A:  I have the model with switch that you push up and it can lock.  So far has worked out great for everything I have used it for

          by|Jun 20, 2023

            A:  Hello, Steve - Thank you for your question. If there were any issues with the previous model then our engineering team would have corrected it. I hope this helps! Additionally, if you need further support, then a RIDGID Customer Experience Professional is here for you, Monday - Friday from 9 am to 6 pm (EST) when you call or text us at 1.866.539.1710 or through email or live chat when you visit us at https://register.ridgidpower.com/contact. And thank you again for your interest in the 18V Brushless Cordless 4.5 in. Angle Grinder Kit w/Grinding Disc, Cut-Off Wheel, 4.0 Ah Battery, and Charger. - Jewel

            by|Jun 24, 2023
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              Q:Lost my spanner wrench for the grinder, where can I purchase another one?
              by|May 12, 2023
              2 Answers
              Answer This Question

              A:  The version of the grinder that I have does not need a spanner wrench. You use an allen key to remove the spindle nut.

              by|May 17, 2023

                A:  Hello, Sami - Thank you for your question. You can purchase part number 634192002 from our parts suppliers Gardner Inc. by calling 877-634-5704. I hope this helps! Additionally, if you need further support, then a RIDGID Customer Experience Professional is here for you, Monday - Friday from 9 am to 6 pm (EST) when you call or text us at 1.866.539.1710 or through email or live chat when you visit us at https://register.ridgidpower.com/contact. And thank you again for your interest in the 18V Brushless Cordless 4-1/2 in. Slide Switch Angle Grinder (Tool Only). - Vini

                by|May 18, 2023
                  Showing 1-4 of 56
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                  Customer Reviews

                  4.3 out of 5
                  (714)
                  • 4.3
                    out of 714 reviews
                  • 70% recommend this product
                  Filter by:
                  Showing 1-10 of 714 reviews
                  My flap disk grinder w/brass handle
                  I had to buy a MAX Output 18v battery. All of my older batteries would not last but less than a minute. Now run just fine for my welding projects.
                  by
                  • Verified Purchase
                  • Recommended
                  2 found this review helpful
                  This is a decent grinder with the exception of the on and off switch. Its seems flimsy and likely...
                  This is a decent grinder with the exception of the on and off switch. Its seems flimsy and likely to break. Switch design needs to change. Contact me for a better design.
                  by
                    5 found this review helpful
                    Not Up to the Job and Bested by a $25 Corded Grinder
                    I purchased this 18v 4.5 inch Grinder and $12 diamond blade to cut an old 6 inch pipe. I went through both my full high capacity batteries and the pipe was winning. I proceeded to take out my old $25 corded 4 inch grinder with a $2 blade and 100 feet of extension cord. My old grinder and cheap blade made short work of the task. I attempted to return online, but was given an error code. I recommend buying a corded tool if possible even if you need to use a generator to power it in a remote location.
                    by
                      13 found this review helpful
                      Been doing some renovations lately and adding some new tools to the arsenal. Had heard good thing...
                      Been doing some renovations lately and adding some new tools to the arsenal. Had heard good things about the Ridgid brand and the Lifetime Service Agreement as well. This is now the 6th Ridgid tool I have bought in the last several months and I have been impressed with all of them: build quality, features, tool performance and value proposition. This grinder and a JobMax multi-tool were part of an Octane promotion and was free with the purchase of two drivers and two batteries. Just started using the grinder, but really happy with my purchase and the knowledge that the LSA is there if needed going forward. Definitely recommend!
                      by
                      • Verified Purchase
                      • Recommended
                      3 found this review helpful
                      Ethics disclosure: Ridgid was kind enough to send out this grinder ahead of release for testing a...
                      Ethics disclosure: Ridgid was kind enough to send out this grinder ahead of release for testing and review. However, I am not paid and I am under no obligation to give a positive review. the thoughts expressed are my own opinion based on factors such as price, performance, ergonomics, and value. Let me start with ergonomics. This grinder has a much better feel in the hand compared to the previous model, thanks to a much slimmer main grip and more rubber overmolding around the gripping area. Over extended grinding and wire wheeling jobs you'll enjoy the extra comfort. Power is quite impressive and is far better than the previous model. It has plenty of power to cut full depth in solid steel, cut rebar with ease, flat stock, angle iron, round stock, and small pipe. Runtime is decent for the power output and you can expect between 13-20 minutes of grinding time on a 9ah Octane battery applying medium to heavy pressure. Runtime when cutting rebar is excellent and you can expect somewhere around 110-120 cuts through 1/2" rebar on a 9ah Octane Battery. Performance when using flap discs, as well as wire wheels is also also excellent and has plenty of power for both applications. Concrete cutting performance is great as well and this grinder cuts through cinder block like butter when equipped with an abrasive concrete cutting disc. Overall this new grinder is an excellent upgrade from the previous model in power and ergonomics. At the same pricing as the previous model, it's also a great value and it probably has the best power per dollar on the market. I highly recommend this grinder to anyone who does some serious metal working and needs the flexibility of cordless and power of corded.
                      by
                        • Recommended
                        5 found this review helpful
                        This grinder is just an awesome tool to have. I do a lot of wood carving, and this is the only gr...
                        This grinder is just an awesome tool to have. I do a lot of wood carving, and this is the only grinder I reach for when starting a job. The first thing that stands out when using this grinder is the OCTANE power. I can cut, grind or carve through anything without the loss of power as the smart batteries constantly supplies what it needs. Not only is it extremely powerful, the comfort of this in the hands is amazing. It allows for a solid grip in the tool because of the textured handle, and I don't have to worry about it slipping. It also conforms around the palm very nicely. Another awesome feature that is simple, but appreciated is how easy it is to adjust the guard. I am constantly working at different angles, so to be able to push a button and adjust the guard position in seconds is awesome for me. One other thing I really like is the the lock button, and how easy it is to use when you tighten/loosen the disk I really love this grinder, and it the only one I use now. Even carving with a King Arthur's chain wheel is awesome. Definitely give this a try!
                        by
                          • Recommended
                          9 found this review helpful
                          A grinder is not something I use often in my shop but when I need one, this has been a great tool...
                          A grinder is not something I use often in my shop but when I need one, this has been a great tool to have. I mostly use mine to cut metal or cut tile backing board. The new grinder has a removable filter cover so you can clean out the dust and small particulate that builds up at the base of the handle. Battery run time was always an issue with the older grinder but the new Octane platform has far exceeded my expectations when doing comparisons. Great product!
                          by
                            • Recommended
                            7 found this review helpful
                            This is a solid angle grinder. It has an overload protection LED that flashes to let you know to...
                            This is a solid angle grinder. It has an overload protection LED that flashes to let you know to ease up on the tool. I've only had this happen while using a flap disk to do some power carving in wood. However, I was putting tons of pressure on the tool to see what it'd take to have the overload come on. Using a grinding disk, cut-off wheel, and wire wheel never made the over load LED come on. The tool is well balanced and has lots of power. I'd recommend this product without hesitation.
                            by
                              • Recommended
                              4 found this review helpful
                              Makes Quick work of 4 amp battery
                              This thing eats batteries like they’re 25 cent chicken wings on nickel beer night
                              by
                              Response from RIDGIDNov 6, 2023
                              Hello, John - We are sorry to hear that you aren't getting the runtime you were hoping for! Would you mind sending us an email at Reviews@RIDGIDmail.com? We would like to learn more so we can try to improve your experience. ridgidtti
                                Good grinder. Needs good batteries
                                Works great. I like the tool free lock ring. I find the trigger to be a little too close to the working end. Would be better if it were a little further back. Would also be good if it had a spot to screw in the handle on top too, not just on the sides. But, it hasn't failed me yet so thats the main thing.
                                by
                                  • Recommended
                                  Showing 1-10 of 714 reviews

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                                  Power Tool Features

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                                  Amperage (A)

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                                  Voltage (V)

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