The Makita XAG21ZU is an 18V LXT brushless 4-1/2 in. / 5 in. paddle-switch grinder combining three safety and convenience features: a dead-man paddle switch with no lock-on, an electric brake that stops the wheel in 2 seconds or less, and AWS (Auto-Start Wireless System) for automatic Bluetooth-activated dust extraction. Variable speed (3,000 to 8,500 RPM) and Automatic Speed Change technology complete a feature set aimed at demanding professionals. Tool only — battery and charger sold separately.
What makes the XAG21ZU different from the XAG11Z?
Both are 18V LXT brushless paddle-switch grinders with electric brakes. The XAG21ZU adds AWS (Auto-Start Wireless System), which uses Bluetooth to automatically start and stop a compatible Makita dust extractor in sync with the grinder trigger. It is the top-of-line 18V LXT paddle-switch option for dust-controlled environments.
Is the XAG21ZU suitable for silica-dust-controlled environments (OSHA Table 1)?
Yes, when paired with a compatible AWS-enabled Makita dust extractor, the XAG21ZU is designed to meet OSHA Table 1 engineering control requirements for wet or vacuum-shrouded grinding on concrete. Verify that the extractor meets the required air volume and filtration class for your specific application.
Does the variable speed on the XAG21ZU go as low as 3,000 RPM?
Yes, the speed dial on the XAG21ZU adjusts from 3,000 to 8,500 RPM, allowing speed matching to different accessories and materials. Lower settings are useful for polishing, stripping, and some specialty abrasives that specify a maximum RPM below 8,500.
Can the XAG21ZU be used without a dust extractor?
Yes. AWS is entirely optional — the XAG21ZU operates as a standard paddle-switch grinder with or without a connected dust extractor. AWS simply adds the automated start/stop convenience when a compatible extractor is present.
What is the advantage of the paddle switch over the slide switch on the XAG17ZU?
The paddle switch requires constant grip pressure to keep the tool running and has no lock-on, making it a dead-man-style switch. If the operator loses control or lets go of the grinder, the tool immediately stops. The XAG17ZU's slide switch with lock-on allows the tool to run without sustained finger pressure, which is more convenient for prolonged use but represents a different safety profile.
# Makita 18V LXT Brushless 4-1/2 in. / 5 in. Paddle Switch Cut-Off/Angle Grinder with Electric Brake and AWS (Tool Only) **Model:** `XAG21ZU` **Brand:** Makita **Category:** Angle Grinder > The Makita XAG21ZU is an 18V LXT brushless 4-1/2 in. / 5 in. paddle-switch grinder combining three safety and convenience features: a dead-man paddle switch with no lock-on, an electric brake that stops the wheel in 2 seconds or less, and AWS (Auto-Start Wireless System) for automatic Bluetooth-activated dust extraction. Variable speed (3,000 to 8,500 RPM) and Automatic Speed Change technology complete a feature set aimed at demanding professionals. Tool only — battery and charger sold separately. ## Specifications | Attribute | Value | |---|---| | Product Type | Angle Grinder | | Voltage | 18 | | Platform | LXT | | Disc Diameter In | 4.5 | | No Load Rpm | 3000-8500 | | Spindle Thread | 5/8 in.-11 | | Brushless | Yes | | Tool Only | Yes | | Battery Included | No | | Charger Included | No | | Weight (lbs) | 5.7 | | Warranty | 3-year limited | ## What's Included - angle grinder - wheel guard - side handle Source: https://www.jaspecs.com/makita/angle-grinder/xag21zu-makita-18v-lxt-brushless-4-1-2-in-angle-grinder-tool-only/