Makita Angle Grinder Kit GAG04M1 5 Inch Wheel Brushless (40V Max XGT 8500 RPM Electric Brake Variable Speed 4.0Ah Battery Metal Masonry Cutting)

Makita GAG04M1 40V Max XGT Brushless Cordless 4-1/2" / 5" Variable Speed Angle Grinder Kit

The Makita GAG04M1 40V Max XGT Brushless Cordless 4-1/2" / 5" Angle Grinder Kit delivers up to 8,500 RPM variable rotational speed and true corded-equivalent performance to cut structural rebar, grind steel weld seams, and score concrete surfaces up to 60% faster than previous battery platforms. Engineered with a five-stage variable speed dial (3,000 to 8,500 RPM) and a rapid electric brake that halts spinning abrasives in under 2 seconds, this high-output grinding tool maintains constant speed under extreme working loads. Equipped with Active Feedback-sensing Technology (AFT) anti-kickback control, an Auto-Start Wireless System (AWS) Bluetooth dust extractor link, a high-capacity 40V Max 4.0Ah battery, and an XGT rapid smart charger, it equips structural ironworkers, mechanical pipefitters, and concrete masons with heavy-duty cordless cutting and surface prep capability.

Best Used For:

• Structural Steel & Rebar Severing: Slicing through #5 (5/8-inch) reinforcing bar, structural steel angle iron, and thick-wall conduit at high cutting velocities up to 8,500 RPM.
• Concrete Surface Smoothing & Tuckpoint Cleanout: Operating 4-1/2-inch and 5-inch diamond cup wheels or tuckpoint blades with paired AWS wireless dust extraction for OSHA Table 1 compliance.
• Precision Weld Bead Blending & Deburring: Dialing down motor speed to 3,000–5,000 RPM for controlled flap disc sanding and polishing on stainless steel and aluminum pipe joints without surface scorching.

Key Performance & Safety Features

• Makita-Built Brushless Motor: Delivers corded-equivalent torque and up to 60% faster cutting speeds across demanding continuous metal fabrication.
• Rapid Electric Braking Mechanism: Electronically forces the grinding wheel or cut-off disc to a complete stop in 2 seconds or less upon switch release.
• 5-Speed Variable RPM Dial: Adjusts motor speed smoothly between 3,000 and 8,500 RPM to optimize cutting and finishing across diverse materials.
• Active Feedback-Sensing Technology (AFT): Shuts off motor power instantly if wheel rotation is suddenly forced to stop or binds in a deep kerf.
• Auto-Start Wireless System (AWS): Uses Bluetooth technology for wireless power-on and power-off synchronization with compatible jobsite dust extractors (transmitter sold separately).
• Extreme Protection Technology (XPT): Internal protective seals and removable wire mesh intake covers prevent conductive metal grinding dust and moisture from entering motor circuitry.

What's Included

• (1) Makita 40V Max XGT Brushless 4-1/2" / 5" Angle Grinder (GAG04)
• (1) Makita 40V Max XGT 4.0Ah Lithium-Ion Battery (BL4040)
• (1) Makita 40V Max XGT Rapid Optimum Charger (DC40RA)
• (1) 5" Inox Depressed Center Grinding Wheel
• (1) 5" Tool-Less Tool Guard Assembly
• (1) Vibration-Absorbing Side Handle
• (1) Lock Nut Wrench
• (1) Heavy-Duty Makita Contractor Tool Bag

Technical Specifications

Pro-Tip: When cutting thick-gauge structural rebar or steel pipe, allow the 40V Max brushless motor to maintain high RPM without applying heavy downward pressure; steady wheel feed prevents binding, engages optimal automatic torque delivery, and extends abrasive disc life.