Milwaukee M18 Fuel 3672 Grinder Review: Cordless Power That Replaces the Cord

Introduction

Cordless grinders have long been the compromise tool: convenient to carry, but rarely convincing when the job calls for sustained, heavy grinding. Milwaukee’s new M18 Fuel 3672 aims to end that trade-off, with the company claiming power equivalent to a 13 amp corded grinder in a fully cordless package. That is a significant claim, since most grinders you plug into the wall run 13 to 15 amps.

This review takes a close look at what comes in the box, how the tool is built, and how it behaves under load on real steel.

First Impressions and What’s in the Box

The 3672 ships as a bare tool, so there is no battery, charger, or grinding wheel included. In the box you get the grinder itself, a wheel guard, a side handle, and a wrench. The side handle can be mounted on either side of the head, and the wrench is what you will use to tighten or remove the nut holding your grinding disc or cut-off wheel.

One thing to plan for: no grinding wheel comes with the tool. That is arguably a good thing, because wheels should always be matched to the material you are working on. Grinding discs and cut-off wheels come in different widths and formulations, so buying the right wheel for steel, aluminum, or your specific job is worth doing deliberately.

Design and Key Features

The paddle switch sits at the bottom of the rear grip, paired with a thumb lock-out that prevents accidental activation. You have to intentionally push the lock-out forward before pulling the trigger, a sensible safety arrangement for a tool of this power level.

The guard is one of the nicer touches here. It installs one specific way, but once on, a small lever lets you rotate it freely and lock it in different positions without tools. That makes on-the-fly adjustments easy, whether you are protecting your hands, your workpiece, or redirecting sparks and debris.

Other details worth noting:

• Overmolded grip with some give, which appears to add a degree of vibration isolation during use.
• A spindle stop that locks the collet so you can loosen or tighten the disc nut with one hand on the wrench.
• One-Key compatibility, so you can track the tool from your phone if it wanders off around a job site.
• Rapid stop braking: the disc spins down briefly after you release the paddle, then the brake brings it to a complete stop. It is not instant, but it is quick.
• Four speed modes, selected by a mode button at the back of the tool. Mode 4 tops out around 9,000 RPM, while lower modes trade speed for control.

The wheel size range is another genuine versatility point: the tool accepts anything from 4-1/2 inch up to 6 inch wheels, so nearly any standard disc you need will fit.

Real-World Grinding Performance

On a piece of angle iron with a grinding disc, the 3672 does not disappoint. Bearing down on the tool did not stall it at all; it kept pushing right through the material. Swapping between mode 1 and mode 4 shows a clear difference in aggression, and the speed control makes it easy to dial in the right feel for the job.

Running a full 6 inch grinding wheel, the tool still felt much like using a corded grinder. There was no noticeable lack of power, which is the core promise here: corded-level performance without the cord, without dragging an extension cord across the shop, and without the risk of a damaged cord getting in the way of the work.

Who This Grinder Is Really For

This is a tool built for professionals. If you need to be free of the cord but still require serious power for heavy-duty grinding and cutting, the 3672 fits that brief. It ships with a guard that supports cut-off wheels as well, so it handles both cutting and grinding operations with the appropriate disc.

For occasional light household tasks, a smaller or less expensive grinder may be all you need. But for metal fabrication, construction, or anyone who regularly works away from wall power, the corded-replacement claim looks credible.

Pricing and Availability

The Milwaukee 3672 is available as a bare tool for $299, or as a kit for $599 that includes two batteries, a charger, and a bag. It can be found at Acme Tools, Home Depot, or wherever Milwaukee tools are sold.

Conclusion

The M18 Fuel 3672 backs up its headline claim with real-world behavior: no stalling under pressure, strong speed control across four modes, quick braking, and a well-thought-out guard system. For professionals who want corded-class grinding power without the cord, this is an easy tool to recommend.