Dewalt DCG405B 20V XR Brushless 4-1/2″ Angle Grinder with Slide Switch

The DEWALT DCG405B 20V XR Brushless 4-1/2″ Angle Grinder with Slide Switch is a cordless grinder designed for cutting, grinding, and surface preparation in metalworking, construction, and repair applications. Built around a brushless motor, this tool eliminates the need for brush changes, which helps reduce maintenance and supports longer motor life over time. Its compact 4-1/2″ wheel size makes it well suited for working in tighter areas while still delivering the power needed for common jobsite grinding and cutting tasks. As part of DEWALT’s PERFORM & PROTECT line, this grinder is designed with added safety features that matter on active jobsites and in busy workshops.

This 20V XR brushless angle grinder is made for tradespeople and serious home users who need cordless mobility without giving up control or stopping power. The slide switch design allows continuous operation during longer tasks such as weld cleanup, rust removal, rebar cutting, and surface smoothing. Safety and restart protection are major advantages of this model. Its Kickback Brake helps stop the wheel quickly when a pinch, stall, or bind-up is detected, helping reduce unwanted movement of the grinder. Power Loss Reset also helps prevent accidental restart after a power interruption if the switch is left in the on position. Together, these features make it a practical cordless angle grinder for fabrication shops, maintenance crews, installers, and general contractors.

Dewalt 20V XR Brushless 4-1/2″ Angle Grinder with Slide Switch At a Glance

• Brushless Motor: Requires no brush changes and helps extend motor life.
• 4-1/2″ Wheel Capacity: Well suited for cutting, grinding, and finishing in tight spaces.
• Slide Switch Operation: Supports steady control during longer grinding or cutting tasks.
• Kickback Brake: Stops the wheel quickly during pinch, stall, or bind-up events.
• Fast Wheel Stop: Brake stops the wheel in 2 seconds or less on average.
• Power Loss Reset: Helps prevent accidental restart after a power disruption.
• Cordless 20V Platform: Offers portability for jobsite and service work.
• PERFORM & PROTECT Design: Built with safety-focused features for demanding use.

Markets

• Construction and Renovation: Used for cutting metal, grinding welds, and preparing surfaces on active jobsites.
• Metal Fabrication: Useful for weld cleanup, edge grinding, and material preparation in fabrication shops.
• Automotive Repair: Helps technicians cut bolts, remove rust, and clean metal parts during repair work.
• Facility Maintenance: Practical for repair crews handling steel, fasteners, and equipment maintenance in commercial buildings.
• Municipal Workers: Suitable for public works and maintenance departments handling repairs on gates, rails, and site equipment.
• Trade Schools and Educational Institutions: Supports hands-on training for grinding, cutting, and safe cordless tool operation.
• Advanced DIY and Home Workshops: A solid choice for home users tackling metalworking, repair, and restoration projects.

Mechanics, contractors, and maintenance teams benefit from a cordless angle grinder that combines mobility with practical safety features. The DEWALT DCG405B is especially useful where extension cords are inconvenient or where workers move between tasks throughout the day. Fabricators can use it for weld cleanup and metal prep, while construction crews can rely on it for cutting and grinding in renovation or installation work.

Facility managers, municipal departments, and training programs also gain value from a grinder that is simple to maintain and designed to reduce restart and kickback risks. For advanced DIY users and small shop owners, this 4-1/2″ angle grinder provides a dependable option for repair, fabrication, and general shop use without the upkeep associated with brushed motors.

Dewalt DCG405B 20V XR Brushless 4-1/2″ Angle Grinders with Slide Switch Features

• Brushless Motor: Designed for long motor life and reduced maintenance because no brush changes are required.
• Kickback Brake Technology: Detects pinch, stall, or bind-up events and applies maximum brake force to stop the wheel quickly, reduce grinder movement, and shut the tool off.
• Fast Brake Response: Stops the wheel in 2 seconds or less on average.
• Power Loss Reset: Helps prevent accidental restarts after power is interrupted while the switch remains in the on position.
• PERFORM & PROTECT Platform: Includes safety-focused features for better jobsite control and user protection.
• Slide Switch Design: Well suited for longer grinding and cutting applications where steady operation is needed.
• Cordless 20V XR Platform: Supports portable use across jobsites, service vehicles, and workshops.

Dewalt DCG405B 20V XR Brushless 4-1/2″ Angle Grinder with Slide Switch Includes

• (1) 20V XR Brushless 4-1/2″ Angle Grinder with Slide Switch

Dewalt DCG405B 20V XR Brushless 4-1/2″ Angle Grinder with Slide Switch Specifications

• Brand: DEWALT
• Model: DCG405B
• Product Type: Cordless Angle Grinder
• Wheel Diameter: 4-1/2″
• Power Source: 20V Battery Platform
• Motor Type: Brushless
• Switch Type: Slide Switch
• Brake Feature: Kickback Brake
• Brake Stop Time: 2 Seconds or Less on Average
• Safety Feature: Power Loss Reset
• Product Line: PERFORM & PROTECT

Why Customers Choose the Dewalt 20V XR Brushless 4-1/2″ Angle Grinder with Slide Switch

Contractors, metalworkers, and service technicians choose the DEWALT DCG405B because it gives them the portability of a cordless angle grinder with the safety features needed for real jobsite use. The brushless motor helps reduce maintenance and supports long-term use, while the 4-1/2″ grinder size works well for common cutting, grinding, and surface prep tasks. In shops, garages, and field service work, the slide switch design is useful for longer passes and repeated material removal.

Users also choose this DEWALT grinder because features like Kickback Brake and Power Loss Reset help reduce common risks during operation. When a wheel binds or stalls, the brake reacts quickly to help stop the wheel and reduce movement. That makes this cordless grinder a practical option for weld cleanup, bolt cutting, rust removal, and general metalworking where control, portability, and dependable performance matter every day.