The Milwaukee M18 FUEL 9 inch cut off saw (model 2786-20) is a good buy if you already run M18 batteries and cut concrete, block or metal often across different job sites. If you only have one big slab to cut, renting a gas saw for the day usually makes more sense.
This cordless saw has the power to cut reinforced concrete and is up to 50% lighter than gas saws, so you can carry it to the job and hold it longer without wearing out your arms. [1] It also has ONE-KEY built in, which lets you connect the tool to your smartphone to track and manage it. [2]
Below you’ll find which concrete, masonry and metal jobs it handles well, the safety steps it needs, what it costs, and when a rental gas saw is the smarter call.
What the saw is and its key specs
The Milwaukee M18 FUEL 9 in. Cut-Off Saw is a cordless, battery-powered saw that spins a 9-inch abrasive or diamond wheel to cut through hard materials. It runs on the same M18 batteries as Milwaukee’s other 18-volt tools, so if you already own drills or impact drivers in that lineup, your packs fit this saw too. To go further, see Milwaukee M12 FUEL Compact Cut Off Tool: What It Cuts and Its Limits.
Blade size and speed
The saw takes a 9 in blade and runs at 6,600 RPM. [3] Blade diameter sets how deep you can cut in one pass, so a 9-inch wheel handles thicker pavers and block than a 4-1/2-inch grinder.
Spec | M18 FUEL 9 in. Cut-Off Saw |
|---|---|
Blade diameter | 9 in [3] |
Power source | M18 battery |
Smart features | ONE-KEY [2] |
The FUEL motor and M18 batteries
FUEL is Milwaukee’s label for its brushless tools in the M18 line. A brushless motor uses electronics in place of the carbon brushes found in older motors, which means less friction and fewer parts that wear out. Because this saw draws a lot of power through a cut, the size of the battery you clip on affects how long it keeps cutting. A larger pack gives you more cuts before you swap. For a closer look, read Milwaukee M18 FUEL Compact Router: What It Handles and Its Limits.
ONE-KEY connection
The saw has ONE-KEY built in, so you can connect it wirelessly to your smartphone to track and manage the tool. [2] For a homeowner, this mostly helps you keep a record of the tool. For a contractor with saws spread across several job sites, tracking makes it easier to see where each one is and who has it.
Bare tool or kit
You can buy the saw two ways. The bare tool, model 2786-20, comes without a battery or charger, which suits you if you already have high-capacity M18 packs. [2] The kit bundles the saw with a battery and charger, which makes more sense if this is your first M18 tool or your current packs are small.
Which concrete, masonry and metal jobs it handles well
The saw is built for hardscape and site work: reinforced concrete, pavers, block, brick and metal like rebar and pipe, as long as you match the wheel to the material. Milwaukee describes it as an extremely versatile solution for cutting a large variety of materials. [4]
Reinforced concrete
Milwaukee rates this saw for reinforced concrete, the kind of slab, step or wall with steel bar running through it. [1] Concrete with rebar inside is a mixed cut, so you meet concrete and steel in the same pass.
Typical jobs include notching a concrete step for a new railing post or cutting a doorway-sized relief in a garage slab. It also handles trimming a section of sidewalk before you break it out. Score shallow passes and deepen them rather than forcing a full-depth cut in one go.
Pavers, block and brick
Patio and wall projects are where a cordless cut-off saw earns its spot. When you lay a paver patio, you end up cutting dozens of pavers to fit curved borders and edges. With no cord, you can walk the saw out to the far corner of the yard and make each cut right where the piece goes.
For a garden wall or raised bed, you can trim concrete block or brick to length and cut half-units for the ends of each course. The 9-inch size gives you enough wheel to get through common block and paver thicknesses in one or two passes.
Rebar, pipe and other metal
Swap to a metal-cutting wheel and the same saw cuts rebar, steel pipe, angle iron and threaded rod. A masonry wheel loads up and wears fast on steel, so keep a separate wheel for each material.
Good examples are cutting rebar stubs flush after a pour or shortening a steel fence post. It also cuts through an old cast-iron or steel drain line during a remodel.
Work inside without engine exhaust
Because it runs on an M18 battery instead of a gas engine, the saw puts out no exhaust fumes. That makes it a practical choice for basements, garages and other enclosed spaces where you could not run a gas saw. Cutting a basement slab for a new drain or trimming block in a crawlspace are jobs where this matters most.
When renting a gas cut-off saw makes more sense
Renting a gas cut-off saw makes more sense when the job is big, continuous and one-off, like slicing a whole driveway slab or a long trench line. The cordless saw wins on weight and convenience for scattered cuts. A gas saw keeps running as long as you refuel it, which matters when you cut for hours.
Factor | M18 FUEL 9 in. cordless | Rented gas cut-off saw |
|---|---|---|
Runtime | Limited by battery charge | Runs as long as you have fuel |
Best fit | Short, frequent cuts across many jobs | Large slabs, long trenches, one-time projects |
The cordless saw is the easier tool to carry, set up and use for a few cuts. A rented gas saw costs you nothing to own and handles long stretches of continuous cutting. Your choice comes down to how much you cut and how often.
Weight and handling
That means less fatigue when you trim pavers on your knees or notch a block wall at chest height. For a quick cut on a patio edge, you grab it and go with no mixing fuel or pull-starting.
Big slabs and long trenches
A job like cutting a 20-foot trench line through a concrete floor, or sectioning a full slab for removal, keeps the blade buried for long periods. Heavy continuous cutting drains batteries fast, and you end up stopping to swap packs or wait on chargers. A gas saw just keeps going, so it finishes these jobs with fewer interruptions.
Buying versus renting
If you need a saw for one weekend of demolition, renting usually beats buying. The kit costs $1,099.99 at one retailer, which is a lot to spend on a tool that then sits on a shelve. [3] Buying pays off when you cut concrete, block or metal regularly and already own M18 batteries; a single large project points to the rental counter.
Safety precautions for cutting concrete and metal
Cutting concrete and metal with a cut-off saw is safe when you control the dust, protect your eyes, ears and lungs, and keep the saw under control from the first second of the cut. The hazards differ by material: concrete throws fine dust, metal throws sparks, and both can cause kickback if the wheel binds.
Control concrete dust
Concrete, brick, block and pavers contain silica, and cutting them releases fine dust you can breathe deep into your lungs. Cut wet when you can: a steady water feed on the wheel keeps most of that dust on the ground. When water isn’t practical, for example indoors over finished flooring, use a dust shroud connected to a vacuum and work with good airflow.
Sweep up with a vacuum or wet methods afterward. Dry sweeping kicks the dust right back into the air.
Handle sparks from metal
Cutting rebar, pipe or angle iron sends a stream of hot sparks off the wheel. Before you start, clear sawdust, rags, fuel cans and dry leaves out of the spark path, and aim the spray away from yourself and anyone nearby. Keep a fire extinguisher within reach when you cut metal near anything that can burn.
Wear the right protection
You need three kinds of protection for every cut:
Safety glasses or goggles, plus a face shield for metal and overhead work
Hearing protection such as earmuffs or foam plugs
A respirator rated for fine dust when cutting masonry, even if you cut wet
Add sturdy gloves, long sleeves and boots. Skip loose clothing that could catch on the wheel.
Set up to prevent kickback
Kickback happens when the wheel pinches in the cut and the saw jumps back toward you. Stand with firm footing, out of the wheel’s direct line, and hold the saw with both hands.
Support the workpiece so the cut opens as you go. A paver resting on two blocks with the cut between them will pinch the wheel, so support it on the waste side so the offcut falls away. Keep the guard in place and adjusted to deflect debris toward the ground.
Pull the trigger and let the wheel reach full speed before it touches the material. Then feed it steadily without forcing it, and let the wheel stop completely before you set the saw down.
What it costs and whether it is worth buying
The kit version of this saw is listed at $1,099.99, so it makes the most sense if you already own M18 batteries and cut concrete, block or metal often enough to use it every month or two. [3] At that price, it is a working tool for regular jobs. For a single patio project, the math rarely works out.
What you pay for
The kit lists for $1,099.99 at one supplier. [3] That price buys the saw packaged with what you need to start cutting, so you are not shopping for extras on day one. The bare tool (model 2786-20) costs less up front, but it only makes sense if you already have M18 packs that can keep up with a 9-inch wheel.
Prices move with sales and bundle deals, so check the current price at a couple of retailers before you buy. Home improvement stores and contractor suppliers often price the kit and the bare tool differently.
What owners think
Retail ratings sit around 4 stars. On one big-box listing the bare tool averages 4.1 stars from 538 ratings. [4] A contractor-focused retailer shows 4.0 stars from 160 ratings. [1]
With that many reviews, you can read the 4-star average as mostly satisfied owners with some complaints. It is a solid tool, though not every buyer loved it. Sort the reviews by lowest rating and read those first. They show you the weak spots before you spend the money, such as runtime on long cuts or weight during overhead work.
Is it worth it for you?
The saw pays off when you already own several M18 batteries and a charger, and when you cut often across different job sites. A remodeler who trims block on Monday, cuts rebar on Wednesday and scores pavers on Friday gets value from grabbing a cordless saw instead of loading a gas saw or making a rental trip.
The case is weaker if you are new to the platform. Adding high-capacity batteries to the purchase pushes your total well past the kit price. If your cutting is limited to one weekend project, put that money toward the job itself.
Picking your next step
Buy the Milwaukee M18 FUEL 9-inch cut-off saw if you already run M18 batteries and cut concrete, block or metal often across different sites. Being up to 50% lighter than gas saws pays off when you carry it from a patio job to a basement wall in the same week, and you skip the fuel mixing. [1]
For a one-time job like cutting a large driveway slab, rent a gas saw instead. If you do buy, pair the saw with M18 high output batteries so demanding cuts in reinforced concrete don’t stall halfway through a pass. Your next step is to list your cutting jobs for the coming year before choosing between buying and renting.