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Model#: MIL-2780-21P
Condition: New

Milwaukee Cordless M18 FUEL 4-1/2" & 5" Grinder 9.0Ah 2780-21P Kit

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Details & Specifications


Milwaukee Cordless M18 FUEL 4-1/2" & 5" Grinder 9.0Ah 2780-21P Kit

The world’s first cordless grinder delivers the power of a corded grinder with up to 2X more run time and up to 10X longer motor life. The M18 FUEL™ 4-1/2" / 5" 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 grinder features REDLINK PLUS™ Intelligence, the most advanced system of cordless power tool electronics, for maximum performance.  The 18-volt lithium-ion grinder’s thin body design gives it optimized balance to rest easily in your hands. Tool-free accessory changes and guard adjustments mean less downtime during work. The grinder is built with the same tool body, gearing system and anti-vibration side handle as Milwaukee’s legendary high-performance corded grinders for maximum durability on the job. Grinding wheel sold separately.


  • 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™ XC5.0 Battery Pack (not included) provides superior pack construction, electronics, and performance to deliver 2X more run-time and more work over pack life

  • POWER TO GRIND: World’s first cordless grinder with corded performance.

  • DURABILITY: Same metal housing & gearing system as legendary high performance corded grinders

  • 100% tool free: Make all accessory changes and guard adjustments without a wrench for increased productivity

  • Paddle-switch design: Provides increased comfort and ease-of-use when operating in various positions



Length 15"
Voltage 18V
Weight 5.8 lbs
Power Source Cordless
Arbor Size 5/8"-11
Switch Type Paddle No-Lock
Speed 8,500 RPM
Trigger Lock No
Vibration Reduction Yes
Tool Free Guard Yes


(1) M18 FUEL™ 4-1/2" / 5" Grinder, Paddle Switch No-Lock (2780-20)
(1) M18™ REDLITHIUM™ HIGH DEMAND™ 9.0 Battery Pack (48-11-1890)
(1) M18™ & M12™ Charger
(1) Wheel Guard
(1) Spanner Wrench
(1) Flange Nut


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