Milwaukee 3672-22 M18 FUEL 4-1/2″-6″ Variable Speed Braking Grinder w/ ONE-KEY Kit (2) 8AH

The Milwaukee 3672-22 M18 FUEL™ 4-1/2″ / 6″ Braking Grinder is built for high-output cutting and grinding where cordless convenience cannot compromise power or safety. A POWERSTATE™ brushless motor sustains 9,000 RPM to match 13A corded grinders, while REDLINK PLUS™ manages heat and load for consistent performance. RAPIDSTOP™ braking brings most abrasive wheels to a stop in under 2 seconds, and the electronic clutch reduces kickback in binds. Four-position variable speed (3,000–9,000 RPM) improves control for flap discs, fiber wheels, and thin-kerf cutting. With the included M18™ REDLITHIUM™ FORGE™ XC8.0 batteries, users get HD12.0-level output in a smaller pack and up to 135 cuts per charge (application-dependent), helping crews work longer between battery swaps.

The grinder ships with Type 27 (grinding) and Type 1 (cutting) guards, a paddle switch with no lock-on, and an anti-vibration side handle for comfort on extended use. ONE-KEY™ support enables tracking, management, and security features across a fleet. Backed by Milwaukee’s 5-year tool warranty, this kit gives trades a compact, cordless grinder that performs like a corded unit and travels anywhere the job demands.

Milwaukee M18 FUEL 4-1/2″-6″ Variable Speed Braking Grinder w/ ONE-KEY Kit At a Glance

• 13A Corded Power (Cordless): Brushless motor holds speed under load for tough cuts and heavy grinding.
• RAPIDSTOP™ Brake < 2s: Fast decel on abrasive discs for improved jobsite safety and productivity.
• Variable Speed 3,000–9,000 RPM: Four settings match wheels and materials for cleaner results.
• Electronic Clutch + Overload Protection: Helps reduce kickback and extends motor life.
• FORGE™ XC8.0 Batteries (2): Delivers HIGH OUTPUT™ HD12.0-class performance in a smaller, lighter pack.
• Anti-Vibration Side Handle: Less vibration for better control over long sessions.
• 5/8″-11 Spindle: Fits common grinding/cutting accessories; quick change with spindle lock.
• ONE-KEY™ Compatible: Customize, track, and lock out tools across your fleet

Markets

• Commercial Electrical & Mechanical Cutting strut, tray, fasteners, and prepping steel for anchors.
• Metal Fabrication & Welding Beveling, grinding welds, and surface prep in the shop or field.
• Facility & Industrial Maintenance Fast repairs on guard rails, racks, and equipment.
• HVAC & Plumbing Cutting fasteners, duct sections, and supports where power is limited.
• General Construction Masonry tuck-pointing (with rated accessories), rebar cutting, and demolition tasks.
• Municipal & Utilities Field work where generator access is limited and rapid stopping improves safety.

Teams that need corded performance without a cord value a grinder that starts fast, stops fast, and keeps power under load. The 3672-22 pairs 13A-class output with RAPIDSTOP braking to reduce downtime between cuts and improve control when moving around occupied sites. Variable speed helps match wheel type to material for less burn and better finish, while the electronic clutch reduces kickback risk on binds. With two FORGE XC8.0 packs in the kit, crews get long runtime and quick turnaround on chargers—ideal for shift work, shutdowns, or high ladder/lift time where extension cords are a hassle. ONE-KEY brings tool management and security to mixed fleets.

Milwaukee 3672-22 M18 FUEL™ 4-1/2″-6″ Variable Speed Braking Grinder, Paddle Switch w/ ONE-KEY™ Kit Features

• Generates 13A Corded Power
• RAPIDSTOP Brake provides stop times under 2 seconds
• Variable speed provides 4 speed setting between 3,000-9,000 RPM
• POWERSTATE™ Brushless Motor: Delivers 9,000 RPM to provide the power to complete the toughest grinding and cutting applications.
• M18™ REDLITHIUM™ FORGE™ XC8.0 Battery Pack delivers you HIGH OUTPUT™ HD12.0 power in a smaller size and the longest life vs. REDLITHIUM™ batteries.
• RAPIDSTOP™ Brake stops most wheels in less than 2 seconds
• Variable speed provides 4 speed settings between 3,000 RPM and 9,000 RPM for greater control
• Electronic clutch for kickback protection
• ONE-KEY™ Compatible: Ability to customize, track and manage tools for increased productivity and investment protection
• REDLINK PLUS™ Intelligence: Most advanced system of electronics in the industry, enabling communication between batteries and tools, allowing for unmatched levels of performance, protection, and compatibility.
• Overload Protection: Maximizes motor life
• Anti-Vibration Side Handle: Reduces vibration, increasing user comfort during extended use
• 5/8″-11 Spindle for use with common grinding accessories
• Compatible with all M18™ Batteries

Milwaukee 3672-22 M18 FUEL™ 4-1/2″-6″ Variable Speed Braking Grinder, Paddle Switch w/ ONE-KEY™ Kit Includes

• (1) M18 FUEL™ 4-1/2″ / 6″ Variable Speed Braking Grinder, Paddle Switch, No Lock
• (2) M18™ REDLITHIUM™ FORGE™ XC8.0 Batteries (8.0 Ah)
• (1) M12™/M18™ Multi-Voltage Charger
• (1) Contractor Bag
• (1) Type 27 Guard (grinding)
• (1) Type 1 Guard (cutting)
• (1) Spanner Wrench
• (1) Anti-Vibration Side Handle

Milwaukee 3672-22 M18 FUEL™ 4-1/2″-6″ Variable Speed Braking Grinder, Paddle Switch w/ ONE-KEY™ Kit Specifications

• MFG Part #: 3672-22
• GTIN / UPC: 00045242780013 / 0045242780013
• Battery System: M18™ (Lithium-Ion)
• Voltage: 18V
• Motor Type: POWERSTATE™ Brushless
• Maximum RPM: 9,000
• Speed Control: Variable (4 settings, 3,000–9,000 RPM)
• Brake: Yes — RAPIDSTOP™ (< 2 s with abrasive disc)
• Electronic Clutch: Yes
• Overload Protection: Yes
• Spindle Size: 5/8″-11
• Compatible Wheel Diameter: 4-1/2″ / 6″
• Switch Type: Paddle, No Lock-On
• ONE-KEY™ Enabled: Yes
• Housing / Materials: Glass-Filled Nylon; Aluminum
• Certifications: cUL Listed; UL Listed
• Weight (Excluding Battery): 5.4 lb
• Weight (Battery Installed): 7.8 lb
• Batteries Included: (2) 8.0 Ah FORGE™
• Charger Included: Yes — M12™/M18™ (120V input)
• Package Dimensions (H × W × D): 11.65″ × 5.16″ × 17.12″
• Package Weight: 15.56 lb

Milwaukee 3672-22 M18 FUEL™ 4-1/2″-6″ Variable Speed Braking Grinder, Paddle Switch w/ ONE-KEY™ Kit Manufacturer Warranty

• Milwaukee’s 5 Year Limited Warranty

Why Professionals Choose the Milwaukee M18 FUEL™ 4-1/2″-6″ Variable Speed Braking Grinder, Paddle Switch w/ ONE-KEY™ Kit

Crews pick this cordless braking grinder because it delivers 13A corded power with safer stopping and better control. The variable-speed range supports flap discs, wire wheels, and thin cut-offs without overspeeding accessories, while the electronic clutch helps reduce kickback during binds. With FORGE XC8.0 batteries, the grinder delivers long runtime and fast recovery, so technicians spend more time on steel and less time at the charger. The paddle, no-lock layout and anti-vibration handle improve handling in awkward positions, and ONE-KEY simplifies tracking across large jobsites. For teams standardizing on the M18 platform, this kit provides the power, control, and runtime needed for daily cutting and grinding

Milwaukee 3672-22 M18 FUEL™ 4-1/2″-6″ Variable Speed Braking Grinder, Paddle Switch w/ ONE-KEY™ Kit Videos

Milwaukee 3672-22 M18 FUEL™ 4-1/2″-6″ Variable Speed Braking Grinder, Paddle Switch w/ ONE-KEY™ Kit Notes for Buyers (quick tips)

• Guard Selection: Use the Type 27 guard for grinding and the Type 1 guard for straight cutting wheels. Never run a Type 1 wheel under a Type 27 guard.
• Wheel Size & Speed: Match accessory ratings to 9,000 RPM and to the selected 4-1/2″ or 6″ size. Do not exceed the wheel’s marked max RPM.
• Variable Speed Use: Lower speeds (3k–5k) help with flap discs and wire wheels on thin material; higher speeds (7k–9k) suit heavy grinding and cut-off wheels.
• Braking Behavior: RAPIDSTOP™ is designed for abrasive wheels; diamond wheels may not stop as quickly—wait for full stop before setting the tool down.
• Clutch Awareness: If the electronic clutch trips during a bind, inspect the wheel and workpiece, adjust your approach, and resume—don’t force the cut.
• Flanges & Mounting: Use the correct backing flange and outer nut for each accessory; confirm the wheel seats flat before tightening.
• Battery Choice Matters: The included FORGE XC8.0 packs deliver peak performance; standard packs will run, but with reduced sustained output.
• PPE & Sparks: Wear eye/face protection and gloves; manage spark direction away from fuel, glass, and personnel.
• Dust Control: When cutting masonry or concrete, use rated accessories and a shroud with dust extraction per local regulations.
• Storage & Transport: Remove the battery and store with guard installed; keep the spindle lock released to avoid accidental wheel damage.