Milwaukee M18 FUEL 4-1/2"-6" Variable Speed Grinder Paddle Switch with ONE-KEY 3672-20

The Milwaukee M18 FUEL 4-1/2"-6" Variable Speed Grinder with Paddle Switch and ONE-KEY (3672-20) delivers 13A corded power on the M18 cordless system, with up to 135 cuts per charge. The POWERSTATE Brushless Motor generates 3,000–9,000 RPM across 4 variable speed settings, providing maximum sustained power for the toughest grinding and cutting applications. RAPIDSTOP Brake stops most wheels in under 2 seconds. Electronic clutch provides kickback protection, and overload protection maximizes motor life. ONE-KEY wireless connectivity lets you customize, track, and manage the tool from your smartphone. Anti-vibration side handle reduces fatigue during extended use. Compatible with all M18 batteries. Tool only — battery and charger sold separately.

Key Features

• 13A Corded-Equivalent Power — Up to 135 cuts per charge on the M18 system
• POWERSTATE Brushless Motor — 3,000–9,000 RPM for the toughest grinding and cutting applications
• 4-Speed Variable Speed Control — Greater control across a range of applications
• RAPIDSTOP Brake — Stops most wheels in under 2 seconds for enhanced safety
• Electronic Clutch — Kickback protection for operator safety
• Overload Protection — Maximizes motor life under heavy loads
• ONE-KEY Compatible — Wirelessly customize, track, and manage the tool via smartphone
• REDLINK PLUS Intelligence — Unmatched performance, protection, and battery compatibility
• Anti-Vibration Side Handle — Reduces vibration for increased comfort during extended use
• 5/8"-11 Spindle — Compatible with common grinding accessories
• Paddle Switch — Ergonomic control for demanding applications
• Compatible with All M18 Batteries — Including REDLITHIUM FORGE XC8.0 for maximum runtime

Specifications

• Brand: Milwaukee
• Model: 3672-20
• Platform: M18 FUEL
• Disc Size: 4-1/2" to 6"
• Speed Range: 3,000–9,000 RPM (4 settings)
• Spindle: 5/8"-11
• Switch Type: Paddle Switch
• Motor: POWERSTATE Brushless
• Brake: RAPIDSTOP (<2 seconds)
• ONE-KEY: Yes
• Battery: M18 REDLITHIUM (sold separately)
• Includes: Tool only (no battery or charger)
• MPN: 3672-20

Frequently Asked Questions

Does this include a battery and charger?
No — the 3672-20 is a tool-only SKU. It is compatible with all Milwaukee M18 REDLITHIUM battery packs and chargers, sold separately. For maximum runtime, Milwaukee recommends pairing with the REDLITHIUM FORGE XC8.0 battery pack.

What is ONE-KEY and how does it work?
ONE-KEY is Milwaukee's digital platform that wirelessly connects compatible tools to a smartphone app via Bluetooth. With the grinder connected, you can customize speed settings, track tool location across job sites, and manage your tool inventory — all from your phone.

What does the RAPIDSTOP brake do?
The RAPIDSTOP brake brings the disc to a stop in under 2 seconds after releasing the paddle switch, significantly reducing the risk of accidental contact with a spinning disc and improving overall jobsite safety.

What disc sizes does this grinder accept?
The 3672-20 accepts 4-1/2" and 6" discs via its 5/8"-11 spindle, making it compatible with a wide range of standard grinding, cutting, and finishing accessories.