Milwaukee 2780-20 M18 Fuel 4-1/2″ / 5″ Grinder w/ Paddle Switch – Tool Only

Milwaukee 2780-20 4-1/2" / 5" Grinder Paddle Switch
Milwaukee 2766-20 M18 FUEL High Torque 1/2" Impact Wrench with Pin Detent - Tool Only
Milwaukee 2780-20 4-1/2" / 5" Grinder Paddle Switch
(5 customer reviews)

Discontinued and replaced with 2880-20

UOM: EA SKU: 2780-20 Categories: , , , , , , , , , UPC: 045242309429


Milwaukee 2780-20 M18 Fuel 4-1/2" / 5" Grinder w/ Paddle Switch, No-Lock (Tool Only)

  • World's first cordless grinder to deliver the performance of a corded tool
  • Uses the same gearing system, metal housing,  guards, flanges and anti-vibration side handles as Milwaukee's high performance corded grinders
  • Electronic clutch prevents bind-up and extends tool life
  • Up to 10X longer motor life means a significantly lower cost of ownership
  • POWERSTATE brushless motor delivers over 80% more power under load, 60% more peak torque and 200% more run-time
  • REDLINK PLUS intelligence system optimizes performance and protects from overloading, over-discharging, and overheating
  • REDLITHIUM battery pack delivers up to 20% more power, up to 2X more run-time, and over 2X more recharges
  • Thin body design for optimized balance
  • Anti-vibration side handle
  • 100% tool-free accessory changes and guard installations and adjustments
  • Length: 15"
  • Weight: 5.8 lbs
  • Speed: 8,500 RPM
  • Arbor size: 5/8"
  • Tool warranty: 5 years


  • Tool only (batteries and charger sold separately)
  • Flange nuts
  • Wheel guard
  • Spanner wrench

Additional information

Weight 6 lbs
Brand Name

18V Power Tools

5 reviews for Milwaukee 2780-20 M18 Fuel 4-1/2″ / 5″ Grinder w/ Paddle Switch – Tool Only

  1. Kim Sepkowski

    Awesome tool and the convenience of being battery operated is the ultimate for use on the Hobby Farm.
    The only issue is it is advertised as 4 1/2 /5 inch. Cannot seem to find the 4 1/2 inch guard option that is advertised….

  2. Jasper Moser

    Great for field repairs or quick jobs around the shop. Not as powerful as a quality corded grinder but they are close. I have 2, one with a cutoff disc and one with a flap disc all the time. I use them weekly

  3. Rod Hadath

    A must have for a farmer. Powerful, no cord, easy for any field jobs

  4. Rick Hyne

    I was doing some demolition work cutting rebar on a JLG and needed a safer tool other than a gas operated cutoff saw. This tool fit the bill. It took a little longer, and went through disks, but the battery stayed strong and that depends on how much leverage you are applying.

  5. Robert A. Gagnon

    Great tool, as powerful as my plugged unit

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