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

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) Model: miln2780-20
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Product Features & specs :

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

Delivering the power to tackle all small grinding and cutting jobs, the M18 FUEL 4-1/2 in. - 5 in. Grinder with No-Lock Paddle Switch (2780-20) is a reliable tool on the jobsite. Favored by mechanical contractors, metal workers and pipe fitters, this cordless angle grinder packs all the puch of a corded grinder without the hassle. Powered by Milwaukee's POWERSTATE brushless motor and paired with a REDLITHIUM Lithium-Ion battery (sold separately), this brushless grinder offers 8500 RPM of grinding, cutting and surface prep speed. The large no-lock paddle aids in user comfort while keeeping users safe and ensuring OSHA compliance. The cordless grinder features a common 5/8 in. - 11 arbor, ensuring compatibility with common accessories including grinding discs, cut-off wheels and wire wheels. Built using many components from its corded counterparts, this cordless angle grinder boasts all the durability users expect from Milwaukee.
  • 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
UL Safety
Wheel Diameter
5 in
No-Load Speed (RPM)
CSA Safety
Switch Settings
Wifi compatibility
Batteries Included
Battery Type
Case Included
Bluetooth Compatibility
Motor Type
Spindle Thread
5/8 in - 11 in
Variable Speed
Switch Type
No-Lock Paddle
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
493 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)
Still the best around!!
I Use this product in my plant. From equipment installs To daily repairs. Still the best around!!
June 27, 2020
Originally posted at
Only milwaukee nothings better
easy to use powerful and durable. Nothing works better.
June 24, 2020
Originally posted at
Best on the market
I use this grinder in a number of ways and it has never let me or my coworkers down
June 23, 2020
Originally posted at
Good addition to my other M18 tools
Very handy grinder. I was tired of the extension cords I use when welding large projects. It's nice to not be connected with a cord.
June 22, 2020
Originally posted at
I will buy another one when this one in worn out
Cutting tile and cement board with out cords is a plus in winter and super convenient
June 21, 2020
Originally posted at
Great grinder
Bought to clean up an old trailer. Worked as it should. Plenty of power and its smooth as silk.
June 21, 2020
Originally posted at
Love the paddle switch
This grinder works awesome. Glad I bought it. I bought just the tool. At ace hardware they had an online deal buy the grinder get a free battery.
June 20, 2020
Originally posted at
Amazing power
This grinder has chewed through everything I've thrown at it. I go looking for reasons to pull it out I'd recommend this one to the tool kit
June 20, 2020
Originally posted at
I would and will buy another one
I use this for welding and fabrication around the farm and to fix things around the house when needed
June 20, 2020
Originally posted at
I would buy it again
Great for cutting and use in fabrication of projects
June 14, 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