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Internet # 323219087

Model # 2939-20

Store SKU # 1008801895

M18 FUEL 18V Lithium-Ion Brushless Cordless 1/4 in. Braking Die Grinder Slide Switch (Tool-Only)

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  • The cordless Variable Speed Die Grinder has more power & run-time
  • This die grinder tool features REDLINK PLUS™ Intelligence
  • Can remove up to 12" of weld bead on (1) M18 5.0ah XC Battery
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Product Details

About This Product

The MILWAUKEE® M18 FUEL™ Braking Die Grinder, Slide Switch, allows users to step up from their corded solutions by delivering 11A Corded Power, and the ability to remove up to 12" of weld bead on (1) M18™ 5.0ah XC Battery. Equipped with RAPIDSTOP™ technology that Provides Braking in under 2 seconds, the M18 FUEL™ Braking Die Grinder, Slide Switch, Provides Enhanced Safety while maximizing work done. The POWERSTATE™ brushless motor delivers 27,000 RPM and maximum power to allow users to maintain grinding power while in the tightest of spaces. This cordless braking die grinder tool delivers up to 2" Accessory Compatibility for material removal and surface prep applications. Milwaukee Die Grinder features REDLINK PLUS™ Intelligence, the most advanced system of Cordless Power tool electronics for maximum performance and longest tool life.


  • Milwaukee POWERSTATE™ Brushless Motor provides more power, more run-time, and longer life
  • REDLINK PLUS™ Intelligence: Most advanced system of electronics in the industry, enabling communication between batteries and tools, allowing for unmatched levels of performance, protection, and compatibility.
  • M18™ REDLITHIUM ™ XC5.0 battery pack (not included) delivers up to 12" of weld bead removed
  • Generating 11A Corded Power, The M18 FUEL™ Braking Die Grinder gives users the power they need to replace Corded Solutions
  • RAPIDSTOP™ Brake stops cutting and sanding accessories in under 2 seconds.
  • Spindle Lock, One Wrench Accessory Change
  • Slide Switch, Designed to Reduce User Fatigue
  • Fits all 1/4" Shank Accessories
  • 27,000 RPM Brushless Motor is designed to deliver corded performance with 2" Accessory Sanding and Cutting Wheel Compatibility
  • Compatible with all M18™ Batteries
  • Includes: M18 FUEL Die Grinder
  • M18 FUEL Die Grinder
  • Includes: M18 FUEL Die Grinder
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  • Click here for more information on Electronic Recycling Programs
  • Return Policy

Product Information

Internet # 323219087

Model # 2939-20

Store SKU # 1008801895

Additional Resources

Shop All Milwaukee


Dimensions: H 3.268 in, W 3.11 in, D 15.5 in


Product Depth (in.)

15.5 in

Product Height (in.)

3.268 in

Product Width (in.)

3.11 in

Wheel Diameter (in.)

2 in


Amperage (A)

0 A

Batteries Included


Battery Amp Hours

No Battery

Battery Power Type

Lithium Ion

Battery Size


Battery Voltage (V)


Charger Included

Charger Not Included

Color Family




Cordless Tool Type

Die Grinder



Electronic Speed Control


Grinder Switch Type

Sliding Switch



Maximum Speed (RPM)

27000 RPM

Motor Type


Number of Total Batteries Included


Power Tool Features

No Additional Features

Primary Collet Size


Product Weight (lb.)

2.89 lb



Tools Product Type

Power Tool

Variable Speed


Warranty / Certifications

Certifications and Listings

UL Listed

Manufacturer Warranty

5 Year Limited Warranty

Questions & Answers

Q:I know it comes with a 1/4" collet but can it fit a 1/2" collet if bought separately?
by|Feb 27, 2024
1 Answer
Answer This Question

A:  Hello! It has a Primary Collet Size 1/4 and fits all 1/4" Shank Accessories. - Milwaukee Tool Social Team

by|Feb 29, 2024
    by|Dec 14, 2023
    2 Answers
    Answer This Question

    A:  I don't own one of these but because it's the switch style instead of the paddle style I would say it's not variable speed.

    by|Dec 17, 2023

      A:  I just bought the paddle style and it is variable speed. 5 speeds

      by|Mar 3, 2024
        Q:Does it come with a collet?
        by|Aug 26, 2023
        1 Answer
        Answer This Question

        A:  The M18 FUEL™ Braking Die Grinder, Slide Switch comes with a collet nut that fits all 1/4" shank accessories. - Milwaukee Tool, Social Team

        by|Oct 21, 2023
          Showing 1-3 of 3

          Customer Reviews

          4.5 out of 5

          • 4.5 out of 47 reviews
          • 91% recommend this product
          Filter by:
          Showing 1-10 of 47 reviews
          Excellent grinder, does not bog
          I have 2 other, smaller M12 die grinders that I normally use when space is at a premium. For bigger jobs - like when dealing with thick metal or welds - I lug out the M18! It does not bog down like the smaller die grinders and maintains speed even when working on steel using carbide bits. The braking feature is pretty good, however it doesn't stop rotation instantly though - it takes about a second for the bit to come to a complete stop. Still pretty good though. Ergonomically it's pretty comfortable to use, even with gloves. The grinder is pretty well balanced during use and both my hands fit on it just fine. No comment on battery life, though I have used some of the smaller M18 packs for several minutes and they've held up just fine. If I had to pick a negative it's that the button for the locking mechanism is a bit too inset. Would be nice if it stuck out just a few more millimeters which would make it easier to manipulate with gloves on.
          • Recommended
          A bit weighty, but excellent.
          I needed a die grinder to wallow out gate hinge holes for larger replacement bolts. The only die grinder I had is air powered and I could not get to my project. This M18 battery powered Milwaukee did the trick. I like not being tethered to an air line or an extension cord. It means I can now grab it and go to a job with no extra hoses or cords. Noise wise, it sounds like my air grinder but noticeably quieter. Obviously the noise level is going to change when under load and depending on what material you are working with. I wear a men’s large glove and this fits my hand well. It is too big for my wife’s size small hands to hold one handed with secure control. The slide switch is easily reached and controlled with just my thumb. The tool is quite nose heavy without a battery. I used a XC 5.0 and it moved the center of gravity back to the handle. It was quite balanced in my hand, but also fairly heavy. The nose is rubberized like the handle, and it is large enough to grab and use for extra control, while keeping my hand safely back from the area being worked. With the battery on the back, this will not stand on end. I personally would never set it that way anyway. It is 15 1/2” long without a battery, so I’d be begging to knock it over. It has an 11/16” collet wrench with it. The lock button is well located and large enough to use comfortably. It would be nice if there was on tool storage for the wrench. I feel like it is going to be easy to misplace. Power wise, it worked just as well as my air driven one. This is far more convenient. Since it is part of the M18 lineup, I have backup batteries if I need them to complete a project. And it is brushless, so it should have extra run time over a brushed die grinder. Overall I am very happy with it.
          • Recommended
          Die Grinder 3/8ths compact 5 star review great pro
          Awesome tool great value very powerful, very sturdy
          • Verified Purchase
          • Recommended
          Powerful!! It’ll eat batteries like no other, but who are we kidding; if you bought this tool you probably have more than one battery.
          • Verified Purchase
          • Recommended
          Great portable die grinder
          I have lots of uses for a die grinder. I have used a pneumatic grinder for years. the problem with the pneumatic one is that large air compressor. That is fine if I am working in my shop but it means that I have to bring everything I am working on into the shop. That is not always easy. In addition you have to contend with an air hose which can get in the way. This grinder seems to be at least as powerful as the pneumatic one and is completely portable. I was pleased that it was offered as a "tool only" buy since I already have a bunch of Milwaukee M18 batteries. It is described as a tool that brakes as soon as you turn it off. It does stop quickly but I don't think it is any quicker than my pneumatic die grinder. All and all this is a very nice addition to my shop full of Milwaukee M18 tools.
          • Recommended
          • Verified Purchase
          • Verified Purchase
          Extreme duty tools for extreme lines of types work
          Absolutely awesome tools I would highly recommend to anyone
          • Verified Purchase
          • Verified Purchase
          I also bought grinding wheels recommended on the grinder page. No way to mount I came by the store and sent chat to Milwaukee. No solution as of now. I may return tool
          Response from Milwaukee ToolMar 15, 2024
          Hi Lesley, we appreciate you taking the time to leave a review on your M18 FUEL die grinder. If you need further assistance, feel free to reach out to us at social.media@milwaukeetool.com. Thank you - Milwaukee Tool Social Team
          • Verified Purchase
          Showing 1-10 of 47 reviews