Milwaukee 2781-20 M18 FUEL Lithium-Ion 4-1/2 in. - 5 in. Slide Switch Grinder with Lock-On (Tool Only)

Milwaukee Model: miln2781-20
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Milwaukee 2781-20 M18 FUEL Lithium-Ion 4-1/2 in. - 5 in. Slide Switch Grinder with Lock-On (Tool Only) Milwaukee Model: miln2781-20
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Product Features & specs :

Milwaukee 2781-20 M18 FUEL Lithium-Ion 4-1/2 in. - 5 in. Slide Switch Grinder with Lock-On (Tool Only)

The M18 FUEL 4-1/2 in. / 5 in. Slide Switch Grinder supplies maximum sustained power to complete the toughest grinding, surface preparation and cutting applications. The POWERSTATE Brushless Motor provides up to 10X longer motor life and lower cost of ownership. The M18 REDLITHIUM XC4.0 Battery Pack (Sold Seperately) delivers up to 4X more run time and 20% more power. The grinder features REDLINK PLUS Intelligence, the most advanced system of cordless power tool electronics, for maximum performance.
  • POWER TO GRIND means the World's first cordless grinder with corded performance
  • Same metal housing and gearing system as legendary high performance corded grinders
  • Thin body design and anti-vibration handle provides optimized balance to rest easily in your hands
  • Tool-free accessory changes and guard adjustments mean less downtime during work
  • POWERSTATE Brushless Motor delivers maximum power and up to 10X longer motor life
  • REDLINK PLUS Intelligence provides optimized performance, electronic clutch, and overload protection using total system communication between tool, battery and charger
  • REDLITHIUM XC 4.0 Battery Pack (Sold Separately) provides superior pack construction, electronics, and performance to deliver 2X more run-time and more work over pack life
What’s Included:
  • M18 FUEL 4-1/2 in. - 5 in. Slide Switch Grinder with Lock-On (Tool Only) -2781-20
  • Wheel Guard
  • Flange Nuts
  • Spanner Wrench
  • Tool Only - Batteries and Charger Sold Separately
Power Source
UL Safety
Switch Settings
Wifi compatibility
Batteries Included
Battery Type
Bluetooth Compatibility
Motor Type
Spindle Thread
5/8 in - 11 in
Switch Type
Arbor Size
5/8 in - 11 in
Charger Included
Wheel Diameter
4-1/2 in / 5 in
No-Load Speed (RPM)
CSA Safety
Case Included
Variable Speed
ETL Safety
Battery System
15 in.
3.27 in.
8.58 in.
5.8 lbs.
Warranty Term
5 Year

Reviews :

4.8 / 5.0
141 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Would you recommend this product?
Yes (12)
Easy To Use (8)
Powerful (8)
Ergonomic Design (7)
Battery Longevity (if applicable) (1)
Best Uses
Heavy Duty Requirements (1)
I would buy Multiple
The tool is lightweight easy to maneuver comfortable grip I like the strength of the spin
July 19, 2020
Originally posted at
This thing is AMAZING!!!
I work on a farm so I use this grinder for a lot of different jobs and it gets them done every time.
July 4, 2020
Originally posted at
Definitely a must have!
Great tool lots of torque. Comfortable in the hand when up in a bucket truck.
June 22, 2020
Originally posted at
I would rebuy this tool
We use this grinder often works great, needs good battery
June 21, 2020
Originally posted at
10 times better than the paddle switch
This grinder is as powerful as a corded one and can be run in tight spaces without constantly holding the switch. Very easy to use with gloves too compared to the paddle switch
June 21, 2020
Originally posted at
Very nice with a big battery
More than enough power to cut bricks and steel. It’s perfect for someone like me. I am an electrician but I do carpentry work for fix and flips. I work on my own, family and friends vehicles and I use this for those stripped bolts. It saves me that 5 minutes every time.
June 20, 2020
Originally posted at
Cuts deeper and quicker !!
Ive used this product to cut thick and thin steel ! Have put it against another brand and the other brand stopped while this one kept going !! Very handy little tool to have portable with no power cord or air ! I find myself using it all over the place for little things I would never have done without it ! Great value for the price !!
June 9, 2020
Originally posted at
The best of the best
literally the best battery powered grinder there is. Plenty of power whether cutting, grinding, or sanding. Long battery life even with only a 5.0 battery.
May 31, 2020
Originally posted at
good grinder like the weight and ease of use
used only one time so far and it was easy to set up and use
May 24, 2020
Originally posted at
Great quality and feel
Good battery life and have had no problems cutting or grinding various items
May 23, 2020
Originally posted at

Q & A :

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Browse 2 questions Browse 2 questions and 5 answers
How long can be used before recharge in production no stop ?
Edwin on Apr 19, 2016
BEST ANSWER: That is a very difficult question to answer, runtime depends on many variables. Without knowing whats being done with the grinder, continous runtime could be anywhere from 30 minutes to a couple hours with the 4Ah battery. Keep in mind, charge time is relatively short, with a couple of batteries you can get alot accomplished with little
Can you interchange the types of Milwaukee batteries with chargers and tools?
Frank on Oct 19, 2015
BEST ANSWER: All Milwaukee 18 volt lithium ion tools and batteries are compatible,so yes everything is interchangeable.