The Milwaukee 3485-20 M12 FUEL 1/4" Right Angle Die Grinder is a cordless right angle die grinder built for service mechanics and metalworking pros who need compact access without giving up real cutting and sanding performance. This is a right angle die grinder designed for grinding, deburring, cleaning, polishing, and light cutting in tight spaces. Model Number: 3485-20.

What makes this tool matter is that it is built to replace the hassle of pneumatic grinders for a lot of everyday shop work. Milwaukee rates it at 0.4 HP output with a brushless motor and 20,000 RPM top speed, and specifically calls out performance with 2 inch cutting wheels and 3 inch sanding accessories. On the job, that means you can clean up welds, smooth edges, prep surfaces, or cut in spots where hoses and compressors usually get in the way.

The control package is a big part of the appeal here. You get 4-mode RPM control plus a responsive variable-speed trigger, so you are not locked into one speed for every task. That matters when you move from aggressive material removal to more careful cleanup work. It gives you better feel on metal edges, fasteners, and tight detail work where too much speed can ruin the finish or burn through a small part.

The right angle layout is the other reason people buy a tool like this. The compact head improves access around engine bays, under dashboards, inside equipment housings, and around welded assemblies where a straight die grinder can be harder to position. Milwaukee also pairs that layout with a barrel-style grip and ergonomic handle shape, which helps with control during longer grinding or polishing sessions.

Milwaukee also addressed the little things that matter in real use. The spindle lock allows one-wrench accessory changes, which is quicker and less annoying than fighting with a two-wrench setup. A shadowless LED work light helps when you are working in darker corners or inside machinery where overhead light never seems to land where you need it.

On the platform side, this tool runs on the Milwaukee M12 battery system and fits 1/4 inch shank accessories. That gives existing M12 users an easy way to add a compact cordless die grinder without jumping to another battery line. It is sold as a bare tool, so it makes the most sense for users who already have M12 batteries and a charger on hand.

Who should buy it? If you are a professional service mechanic, fab shop user, maintenance tech, HVAC installer, or metalworking contractor who needs a compact cordless grinder for cleanup and access work, this is the right kind of tool. If your work is mostly heavy, continuous grinding all day, a larger grinder may still make more sense. But for mobility, control, and working where air tools are a pain, this one is built for the job.

A Real Upgrade from Air for Access Work

The Milwaukee 3485-20 M12 FUEL 1/4" Right Angle Die Grinder makes a strong case for leaving the hose behind when your work is all about access, control, and quick cleanup.

• Who it's for: Mechanics, fab guys, maintenance techs, and M12 users who need a compact die grinder for deburring, sanding, polishing, and light cutoff work.
• Why it stands out: The right angle layout, 4-mode control, brushless power, and one-wrench spindle lock make it more practical than a lot of cordless grinders that feel like cut-down versions of bigger tools.
• Worth knowing: This is a bare tool, so plan on supplying your own M12 battery and charger. It is strongest as a precision and access grinder, not a replacement for every heavy grinder in the shop.

• What type of tool is this? This is a cordless right angle die grinder designed for grinding, deburring, cleaning, polishing, and light cutting.
• What battery system does it use? It runs on the Milwaukee M12 battery platform.
• What accessory shank size does it accept? It fits 1/4 inch shank accessories.
• What is the top speed? Milwaukee lists this model at 20,000 RPM.
• Is ONE-KEY enabled? No, Milwaukee lists this model as not ONE-KEY enabled.