Milwaukee 2780-20 M18 FUEL Lithium-Ion 4-1/2 in./5 in. Paddle Switch Grinder (Tool Only)

Milwaukee Model: miln2780-20
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Milwaukee 2780-20 M18 FUEL Lithium-Ion 4-1/2 in./5 in. Paddle Switch Grinder (Tool Only) Milwaukee Model: miln2780-20
price for vip customer


Product Features & specs :

M18 FUEL Lithium-Ion Paddle Switch Grinder performs like a corded grinder


World’s first cordless grinder with corded performance (battery and charger sold separately)

M18 FUEL Lithium-Ion Paddle Switch Grinder provides more run-time per charge


POWERSTATE Brushless Motor provides more run-time per charge (battery and charger sold separately)

M18 FUEL Lithium-Ion Paddle Switch Grinder has the same durability as corded grinders


Same metal housing and gearing system as legendary high performance corded grinders (battery and charger sold separately)

Milwaukee 2780-20 M18 FUEL Lithium-Ion 4-1/2 in./5 in. Paddle Switch Grinder (Tool Only)

The Milwaukee 2780-20 M18 FUEL 4-1/2 in - 5 in. Grinder with No-Lock Paddle Switch is the industry's first cordless grinder with the power to tackle heavy-duty grinding applications. This brushless grinder delivers 8500 RPM to tackle fade-free grinding, surface prep and cut-off jobs. A slim ergonomic handle and large paddle switch ensure comfort with or without gloves, and the shock absorbing handle reduces vibration. The no-lock switch is fully OSHA compliant and ensures a dropped grinder won't continue spinning. A tool-free guard helps users make quick adjustments while the 5/8 in. - 11 arbor accepts common cut-off wheels, grinding discs and wire cups. Legendary Milwaukee durability is found throughout, as this grinder uses many of the same components found in our durable corded units.
  • POWERSTATE brushless motor delivers 8500 RPM of grinding and cutting speed and the power of a corded grinder
  • Utilizes the same metal housing and gearing system as Milwaukee high performance corded grinders for ultimate durability
  • REDLINK PLUS Intelligence optimizes performance and monitors tool to prevent damage from overload conditions
  • Large no-lock paddle ensures comfort during long grinding and cutting applications and is fully OSHA compliant
  • Tool-free guard adjusts with ease
  • The world's first cordless grinder that delivers the performance of a corded grinder
  • Compatible with all M18 REDLITHIUM batteries
What’s Included:
  • M18 FUEL 4-1/2 in. - 5 in. Grinder with No-Lock Paddle Switch - 2780-20
  • (1) 5 in. Type 27 Guard
  • Flange Nuts
  • (1) Spanner Wrench
  • Battery and charger sold separately
Power Source
Bluetooth Compatibility
Motor Type
UL Safety
Wheel Diameter
5 in
No-Load Speed (RPM)
Spindle Thread
5/8 in - 11 in
CSA Safety
Switch Settings
Wifi compatibility
Batteries Included
Variable Speed
Switch Type
No-Lock Paddle
Battery Type
Case Included
Arbor Size
5/8 in - 11 in
Charger Included
ETL Safety
Battery System
15 in.
3.27 in.
8.58 in.
5.8 lbs.
Warranty Term
5 Year

Reviews :

4.8 / 5.0
533 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Would you recommend this product?
Yes (41)
Easy To Use (38)
Powerful (36)
Ergonomic Design (32)
Value (10)
Heavy (1)
Short Run Time (if applicable) (1)
Best Uses
Frequent Use (12)
Small Projects (11)
Jobsite (10)
Home Repair (9)
Excellent Tool, Excellent Quality!
Great for cutting or grinding, I primarily use it for quick precise wood carvings. Great tool, but it will eat up batteries
August 23, 2020
Originally posted at
Super Grinder/ Cut Off Tool
All my tools are Milwaukee 12 and 18 volt so when I had the opportunity to purchase the 2780 I did. I have used it a couple of times since purchasing it and like every other Milwaukee tool I have, it is great. Love the power it has. The paddle switch is awesome
August 22, 2020
Originally posted at
This tool works as hard as I do.
This is actually the 3rd one I've bought. The 1st one I bought had many, many, many miles on it before it finally quit (5 years later .
These M18 FUEL models do an amazing amount of work in truly the harshest conditions. I've had mine in the rain (many times), extreme cold conditions, extreme heat conditions (S.W. Missouri & NW Arkansas weather) and I think I can truly say it doesn't seem to affect the life of the tool.
These tools work as hard I do.
August 9, 2020
Originally posted at
I love me some red tools
I love the quick adjustable guard it is very user friendly and the paddle switch
August 8, 2020
Originally posted at
Out performs competition!
If your in the market for battery powered tools Milwaukee is top of the line. I Used to have Dewalt but Milwaukee out preforms the market with high performance tools, for any job.
August 8, 2020
Originally posted at
Best tool ive bought in years.
I am so happy this thing cuts locks, steel, sheet metal on demand and powerful. One of my favorite tools
August 8, 2020
Originally posted at
Good grinder
This is my second one. First one lasted about 3 years getting used ever day and dropped on occasion.
August 8, 2020
Originally posted at
Best thing ever.
I came from a M18 brushed grinder. And no I have the brushless one. All I can say is the power difference is unreal.
August 2, 2020
Originally posted at
Great for cast iron pipe
I was doing demo of an entire cast iron waste system in a crawlspace and carbide blades were taking too long. I have a corded grinder but didn't want to deal with dragging cords underneath and I was trying to move quickly in this job. Got a thin diamond blade and completely demoed that system with one 4.0 battery in no time. Didn't bind and had the guts to cut through the cast with ease.
August 1, 2020
Originally posted at
m18 grinder
Very powerful tool, use it to cut and grind, as good as to use regular corded one.
July 25, 2020
Originally posted at

Q & A :

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Browse 11 questions Browse 11 questions and 13 answers
Is this compatable with the HD9.0 battery?
Jimmy S on May 29, 2019
BEST ANSWER: It is compatible with any M18 Milwaukee battery. The heavier 9.0 battery could make it a "handful," affecting the balance of the grinder.
Will this work with a normal 18v battery or does it have to be the XC 4.0
Ross on Dec 23, 2014
BEST ANSWER: The grinder will work with any M18 series battery
Does this come with a wheel?
This guy on Jun 2, 2020
BEST ANSWER: No, tool only with this model.
if these are so good how come they have recondition ones already ?
A shopper on Sep 29, 2018
BEST ANSWER: Your question will be best answered by the manufacturer, who can provide you with the accurate information. The number to reach the technician directly is 1-800-729-3878 or online at
Does it come with a case or bag?
A shopper on Aug 17, 2018
BEST ANSWER: The item will not include any case or bag.
You said milwaukee has a 5 year warranty i bought my milwaukee grinder 8 months ago it stopped working can I send it to y'all warehouse and get a replacement or how will that work? thank you
chino on Sep 13, 2017
BEST ANSWER: Milwaukee warranties will need to be handled through the manufacturer directly. They can be reached at 800-729-3878. From there you will be referenced to a service center in your area
What is the warranty on this item?
waylon on Dec 10, 2015
BEST ANSWER: Milwaukee offers a 5 year warranty on this tool.
I bought this tool to use on a log home sanding large pillar logs.

Where can I find/buy the accessories to do the job? Sanding disks, backing pad, spindle, disc nut, etc??
Thanks for the help
Rod on Sep 16, 2014
BEST ANSWER: Please contact the manufacturer direct at 1-800-729-3878 for a service/parts center in your area.
where can I find the flange nut kit for the milwaukee 18volt cordless grinder?
A shopper on Apr 20, 2018