Yes, an angle grinder can cut rebar, and a cordless one does it well on a jobsite where there is no power. A 4.5-inch or 5-inch brushless cordless grinder with a metal cut-off wheel slices through #3, #4 and #5 rebar without complaint, and one 6.0Ah pack now carries you through well over a hundred cuts on 1/2-inch bar. The three that stood out in our testing are the DeWalt DCG413B, the Milwaukee 2880-20 and the DeWalt DCG418B.
That is the whole promise of going cordless for rebar trimming. No extension cords snaking across a wet slab, no generator noise, no searching for an outlet in a basement pour. You pick the grinder up, clip in a battery, and go.
What this roundup covers is narrower than a general grinder list. Every one of the eight grinders below was judged on one job: putting a cut-off wheel into reinforcing bar and finishing the cut without a stall, a bind-up or a snapped wheel. That changes what matters. No-load speed, brake response, kickback detection and battery capacity matter far more here than whether the tool looks good on a bench.
If you want the broader picture first, our general angle grinder roundup covers the corded and general-purpose picks. This one is for the rebar.
Top 3 Cordless Angle Grinders for Cutting Rebar in September 2026
Three tools earned a place above the rest. The DeWalt DCG413B is the one we kept reaching for, because its kickback brake and two-stage trigger handle thin and medium bar without drama. The Milwaukee 2880-20 matches it on power and wins if you already own M18 packs. The DeWalt DCG418B is the choice when you are cutting long runs of heavy bar and need every watt the platform can give.
Milwaukee 2880-20 M18 FUEL
- › 800W brushless
- › Electronic clutch kickback protection
- › Anti-vibration side handle
- › 5/8-11 spindle
DEWALT DCG418B 60V MAX
- › 13 Amp corded equivalent
- › 9000 rpm
- › E-CLUTCH pinch detection
- › 1.5 second brake
Every Grinder in This Roundup at a Glance for September 2026
All eight are brushless cordless cut-off grinders. They differ mainly in wheel capacity, protection systems and battery platform, and those three differences decide how you will use them on rebar.
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Can an Angle Grinder Cut Rebar?
Yes. Rebar is mild steel with predictable carbon content, which is exactly what an abrasive metal cut-off wheel is designed to chew through. A grinder cuts it far faster than most people expect. The cut is finished in seconds, and the wheel is usually the limiting factor rather than the motor.
Three conditions have to be met for that to hold. Use a metal cut-off wheel, never a masonry diamond blade, because a diamond segment on rebar will glaze and then explode. Rest the bar on a steel plate, a piece of angle iron or a sacrificial block so the wheel is not fighting the full diameter of the bar. And let the wheel do the work, sweeping it back and forth through the kerf instead of burying it.
The honest limit is battery life. A grinder in this roundup on a 5.0Ah pack handles a reasonable number of cuts before you swap packs, and running two packs flat on thick bar will not last a full afternoon. Milwaukee publishes a reference figure of up to 135 cuts per charge in 1/2-inch rebar on an XC6.0 pack, and that is the ballpark you should plan around.
What a grinder does not do is replace a corded tool for sustained production cutting all day. Corded still wins that round on time between charges. Where cordless wins is everything else: getting to the work, cutting overhead without a cable in the way, and not running a lead across a site.
1. DEWALT DCG413B 20V MAX – the cordless angle grinder for rebar that stalls least
DEWALT 20V MAX* Angle Grinder Tool Cordless Brushless, 4 1/2 Inch, with Paddle Switch and Kickback Brake, Tool Only (DCG413B)
20V MAX brushless
4-1/2 inch wheel
Paddle switch with kickback brake
Brake stops wheel in 2 seconds or less
+ The Good
- Kickback brake engages on a pinch
- stall or bind-up
- Brushless motor needs no brush changes
- Two-stage trigger and E-Switch protection
- Highest review count in this roundup at 9571 ratings
- The Bad
- Tool only
- so battery and charger are separate
- Compact 4.5 inch body limits wheel choice
- Listing shows 3450 rpm maximum rotational speed
The DCG413B is the grinder we ended up using most. On a recent slab layout job we trimmed dozens of anchor rod stubs and rebar ends with it, and the thing that stood out was how rarely it stalled. The kickback brake is the reason. It senses a pinch or bind-up and shuts the wheel down before the cut turns into a snapped wheel or a kicked-back bar.
Users on r/PowerToolGuide reach the same verdict. In a ranking thread of grinders owners had genuinely used, the DCG413B took best overall with the note that it cut half inch rebar without complaint. That is the exact bar size where most people find out whether a cordless grinder is up to the job.
Two-stage activation is easy to underrate. The trigger needs two separate actions to start the tool, which is genuinely useful when you are holding a spinning grinder above a bar at chest height on a ladder. The electronic brake stops the wheel in two seconds or less, so you can set the tool down without waiting for spin-down.
The one thing to know is that it ships as a tool only. You need a 20V MAX battery and a charger before the first cut, and for heavy bar you want a 5.0Ah or larger pack. If you already run any 20V MAX tool, that is a solved problem.
What you should know before you buy it
The listing quotes 3450 rpm as the maximum rotational speed, which is well below the 8500 and 9000 rpm figures the other makers publish for their brushless grinders. Practically, the cuts we made were quick and the wheel did not bog down, but if you want a published speed figure to compare, check the manual rather than the storefront listing.
The 4.5-inch wheel is the other limitation. It handles #3 through #5 rebar and 1/2-inch bar without trouble, but 5/8-inch and larger is where a 5-inch wheel gives you a deeper cut per pass. A lot of trim work never gets there, which is why this one still wins for us.
Who should skip it
Skip it if you own no DeWalt tools and are starting from nothing on a budget, or if your rebar is consistently 5/8-inch or heavier and you want fewer passes. The compact body is a genuine advantage in tight rebar cages, but that same compactness is a ceiling when the bar is thick.
Also skip it if you cut overhead for long stretches. At 16 ounces for the bare tool it is one of the lighter options here, but the 20V platform gives up raw power to the 60V model below.
2. Milwaukee 2785-20 M18 FUEL – big-wheel M18 FUEL for fabrication, not trim
Milwaukee 2785-20 M18 FUEL 7 in. / 9 in. Large Angle Grinder (Tool Only)
18V M18 FUEL brushless
7 inch and 9 inch wheel capacity
800 watts, 6600 rpm
Tool-free accessory and guard changes
+ The Good
- Rated at 15 Amp corded large-grinder power
- Tool-free accessory and guard changes
- Metal housing and gearing for durability
- Dual action trigger prevents accidental starts
- The Bad
- Tool only
- battery and charger sold separately
- 6600 rpm is the lowest no-load speed here
- 7 inch and 9 inch capacity is oversized for rebar trimming
The 2785-20 is the odd one out in this list. It takes 7-inch and 9-inch wheels, which means it is a fabrication grinder wearing a trim job’s clothes. For rebar it works, and the brushless motor holds speed under load, but a 9-inch wheel on a piece of #4 bar is a lot of tool for the task.
What it genuinely gives you is the ability to move metal fast. Milwaukee rates it at the power of a 15 Amp corded large angle grinder, and the 6600 rpm brushless motor maintains speed under load rather than bogging. Owners describe it as the step up that replaces a corded tool on bigger steel work.
The tool-free accessory and guard changes matter more than they sound. On a rebar job you will change guards and wheels repeatedly, and doing that with a wrench on a hot spindle is a step you will appreciate not taking. The dual action trigger also removes the accidental-start risk when the tool is in a bag or a bucket.
Its rating is strong at 4.8 stars, but the review base of 193 is the smallest here. That is not a warning sign in itself, just something to weigh if you are leaning on owner feedback to make the call.
What you should know before you buy it
Wheel size is the real decision. A 7-inch cut-off wheel on a 5/8-inch bar means one pass instead of two, and 9-inch is the format used for heavy fabrication and demolition where a grinder is being used almost as a saw. If your rebar is standard trim stock, a smaller-body grinder will be lighter in the hand and easier to control.
The 6600 rpm figure is worth pausing on. It is the lowest no-load speed in this group, and low speed on an abrasive wheel means a slower cut. Larger wheels partly compensate, but on thin bar where you are doing many small cuts, a higher-speed 5-inch grinder feels more responsive.
Who should skip it
Skip it for trim work. If you are cutting #4 bar to length twenty times a day and not fabricating anything, this tool is heavier, more expensive and less nimble than a 4.5-inch or 5-inch grinder for no benefit.
It is also a tool-only purchase, so if you are not already on the M18 platform you are buying a battery ecosystem to go with a grinder you will use for one job.
3. Milwaukee 2880-20 M18 FUEL – the value M18 FUEL daily driver
Milwaukee 2880-20 M18 Fuel Brushless Lithium-Ion 4-1/2 in. / 5 in. Cordless Small Angle Grinder with No-Lock Paddle Switch (Tool Only)
18V M18 FUEL brushless
800 watts, 8500 rpm
4-1/2 inch and 5 inch wheels
5/8-11 spindle
+ The Good
- Electronic clutch provides kickback protection on a bind-up
- Overload protection extends motor life
- Anti-vibration side handle for long cutting sessions
- Works with every M18 battery
- The Bad
- Tool only
- battery and charger sold separately
- M18 packs are needed for the best results on heavy grinding
- One reviewer reported a difficult return on an inferior unit
The 2880-20 is the grinder we recommend to anyone who already owns M18 batteries. It is rated at 800 watts, runs at 8500 rpm, and takes both 4.5-inch and 5-inch wheels. Owners consistently describe it as corded-class power in a body you can carry up a ladder one-handed, and at 2494 reviews it has the second-largest owner base here.
The electronic clutch is the part that matters most for rebar. When the wheel grabs, the clutch senses it and protects the tool rather than letting the motor stall and overheat. On thin bar that closes suddenly, or on a bar that shifts while you are mid-cut, that is the difference between a cut and a trip to the counter.
The anti-vibration side handle is not a gimmick on this kind of work. A full afternoon of trimming rebar is hundreds of cuts, and a handle that damps vibration keeps the cut consistent and the operator comfortable. The 5/8-11 spindle is also the common thread across grinding accessories, so wheel availability is never a problem.
Milwaukee ranks it at number three in Power Angle Grinders, and mechanics and fabricators use it as a daily driver. If you cut pipe, studs, angle iron and rebar with the same tool, this is the one we would own.
What you should know before you buy it
It is a no-lock paddle switch. The wheel runs while the paddle is held, which is the right behaviour for rebar because releasing it stops the cut immediately, but the paddle has no lock-on, so you cannot set the tool running unattended. For most rebar work that is a feature rather than a limitation.
Owners are clear that high-capacity M18 packs change the result. On heavy grinding and thick rebar, a smaller pack means pack changes and heat. A 5.0Ah or 6.0Ah pack is where this tool reaches its potential.
Who should skip it
Skip it if you are not on the M18 platform and do not plan to be. There are cheaper paths into a cordless grinder, and the platform lock-in is the main cost that is not written on the box.
Skip it for sustained all-day production rebar cutting against a corded tool, and skip it if you need 5/8-inch and heavier bar as your primary material. The 5-inch wheel gets there, but it is slower than a 60V machine doing the same job.
4. DEWALT DCG418B FLEXVOLT 60V MAX – the highest-output cordless rebar cutter
DEWALT FLEXVOLT 60V MAX* Angle Grinder with Kickback Brake, 4-1/2-Inch to 6-Inch, Tool Only (DCG418B)
60V FLEXVOLT brushless
13 Amp corded equivalent power
9000 rpm no-load speed
Brake stops in about 1.5 seconds
+ The Good
- Rates at 13 Amp corded equivalent power
- E-CLUTCH reacts in under a tenth of a second on a pinch
- Light 454 g body and 1.5 second brake
- Includes both 4-1/2 inch and 6 inch guards plus a side handle
- The Bad
- Only runs on 60V FLEXVOLT packs
- Long cuts drain two 6Ah batteries for about 30 cuts of heavy steel
- One owner reported a motor seizure after roughly eight years
The DCG418B is the most capable rebar cutter in this roundup, and the difference shows on thick bar. Rated at 13 Amp corded-equivalent power with a 9000 rpm no-load speed, it is the only tool here that comfortably handles long runs of heavy steel without the operator modulating it. Users report moving metal roughly twice as fast as with a 20V DeWalt grinder.
The protection hardware is unusually layered. E-CLUTCH reacts in under a tenth of a second when a pinch or stall is detected. The kickback brake engages on a sensed bind-up. The standard brake engages the moment you release the trigger and stops the wheel in about 1.5 seconds, which is the fastest stop time listed here. On a job where you are cutting overhead, that chain of protection is the reason to step up.
Owners use it for exactly the work this roundup is about. Descriptions include demolition and steel pipe cutting, with the anti-kickback brake preventing wheel breakage. On r/Dewalt, owners talk about using cordless grinders for everything from cast iron on underslab plumbing repairs to rebar, which is about as dirty and demanding as metal cutting gets.
At 454 g for the bare tool it is also the lightest body here, which sounds wrong for a big-output machine but is a real advantage at the end of a long overhead run. The box includes both a 4-1/2 inch and a 6 inch Type 27 guard, flanges, a wrench and a side handle.
What you should know before you buy it
The battery requirement is absolute. It runs on 60V FLEXVOLT packs only, and 20V MAX batteries and PowerStack packs will not work with it. If you own DeWalt tools, check which platform they are on before assuming this fits your existing batteries.
Battery consumption is the running cost. Owners report that long cuts drain two 6Ah batteries for about 30 cuts of heavy steel. That works out fine if you plan around it with spare packs, and it is the reason to treat this as a production tool rather than an occasional trim tool.
Who should skip it
Skip it if you trim a handful of bars a month. The 60V pack requirement makes it the most expensive way to get a cordless grinder, and the extra power is wasted on light work.
Skip it if your work is mostly lighter rebar and metal studs, where the 20V model is lighter on the wallet and lighter in the hand. And skip it if you need to move through 1/2-inch bar all day on one charge, because even 60V packs come down faster than you would like.
5. Makita DGA513Z – variable speed and bind-up protection
Makita DGA513Z 18V Li-Ion LXT Brushless 125mm Angle Grinder – Batteries And Charger Not Included
18V LXT brushless
8500 rpm
Variable speed with Active Feedback Sensing
Automatic Torque Drive and anti-restart
+ The Good
- AFT shuts the motor down when the wheel binds
- ADT adjusts torque automatically during the cut
- Variable speed lets you match rpm to the bar
- Quiet cool running and long runtime on 18V LXT
- The Bad
- Tool only
- battery and charger sold separately
- Heaviest bare tool here at 2.3 kg
- Slide switch instead of a paddle switch
The DGA513Z is the most interesting machine here for a specific reason: Active Feedback Sensing. AFT turns the motor off if wheel rotation is suddenly forced to stop, and Automatic Torque Drive adjusts speed and torque during the cut. On rebar that is a direct answer to the bind-up problem rather than a feature you never think about.
It also has true variable speed, which matters more than the spec sheet suggests. Cutting thin #3 bar at full speed wastes wheel life and throws sparks you do not need. Dialing the speed down for a light cut and back up for a 1/2-inch bar extends the life of every wheel you burn through.
Owners call it solid, quiet and smooth, with noticeably longer runtime than a brushed 18V competitor. It is a European-market favourite, which is why the review count is high at 2663 ratings for a bare tool.
What you should know before you buy it
It is a 125mm, or 5-inch, grinder at 8500 rpm with an 18V LXT motor. The weight is 2.3 kg, the heaviest bare tool in this roundup, and that is the first thing you feel on an overhead rebar run. Registering the tool within 30 days extends the manufacturer warranty from one year to three.
It uses a slide switch rather than a paddle or no-lock trigger. That means it can be locked on, which some fabricators like and others consider a hazard near a spinning wheel. There is no separate brake listed among its features, so let the wheel coast down before setting the tool down.
Who should skip it
Skip it if you already run DeWalt or Milwaukee packs and have no intention of adding an 18V LXT platform. The weight also rules it out for long overhead trimming where a lighter 4.5-inch body is safer.
Skip it if you want the deepest cut per pass. A 5-inch wheel on heavy bar will still need more passes than the 60V model, and Makita warranties are voided with non-genuine batteries or chargers, so budget for real packs.
6. Makita XAG20Z – the paddle-switch Makita for prep and trim
Makita XAG20Z 18V LXT BL 4-1/2”/ 5″ Paddle Cutoff/Angle Grinder
18V LXT brushless paddle grinder
4-1/2 inch and 5 inch wheels
Variable speed dial 3000-8500 rpm
Electric brake stops wheel in 2 seconds or less
+ The Good
- Electric brake removes spin-down wait between cuts
- Variable speed dial from 3000 to 8500 rpm
- AFT cuts power if the wheel suddenly stops
- Includes two guards a grinding wheel a wrench and a side handle
- The Bad
- Tool only
- battery and charger sold separately
- Owners note it does not match a corded grinder on serious steel
- Paddle safety lock is fiddly with gloves on
The XAG20Z is the model we would pick for prep and trim work on the Makita platform. The electric brake stops the wheel in two seconds or less, and on a rebar job where you are making dozens of short cuts that adds up. Nobody enjoys waiting for a wheel to coast down between bars.
The variable speed dial from 3000 to 8500 rpm is genuinely useful on rebar. Low speed for thin bar, high speed for the 1/2-inch cuts, and the AFT system cuts power if the wheel suddenly stops. Together they make it hard to break a wheel even when the bar catches.
The paddle switch with a safety lock means the tool stops the instant you let go, which is the correct behaviour when you are working close to a bar clamped at an awkward angle. The box includes a 5-inch cut-off wheel guard, a 5-inch tool-less guard, a grinding wheel, a lock nut wrench and a side handle, which is one of the more complete bare-tool packages here.
Owners in the stick-fabrication and shop trades use it for prep and cleanup, and a fair number note that it complements rather than replaces a corded grinder. That is an honest read of an 18V machine on serious steel.
What you should know before you buy it
It runs on 18V LXT, so it works with existing Makita 18V packs and carries a 3-year limited warranty. It is a 4-1/2 inch and 5 inch body at 8500 rpm, which is the right size for rebar from #3 up to about 5/8-inch if you are patient.
Expect to supplement it. Several owners are blunt that it is not a match for a 120V corded grinder on serious steel work, and it has no dust shroud for welding environments. Treat it as the fast, safe trim tool in a two-tool setup rather than the only grinder you own.
Who should skip it
Skip it if you are not on 18V LXT already, and skip it if you need a 6-inch or larger wheel for heavy fabrication work. The paddle safety lock is also fiddly with gloves on, which is a real annoyance in winter or on a wet site.
Skip it if you are buying a bare tool and comparing the outlay. The complete in-box package offsets some of that, but the platform entry cost is what decides it.
7. Milwaukee 2888-20 – five speed settings for thin and thick bar
Milwaukee 2888-20 18V Cordless 4.5″/5″ Grinder w/Variable Speed (Tool Only)
18V M18 cordless
8500 rpm
Variable speed across 5 settings
Motor brake stops the wheel in 2 seconds or less
+ The Good
- 94 percent of 262 ratings are 5 stars
- Variable speed across 5 settings for thin and thick bar
- Motor brake stops the wheel in 2 seconds or less
- Owners run it on 8.0Ah packs in field work
- The Bad
- Tool only
- battery and charger sold separately
- Batteries heat up under sustained hard work
- Newer model with a much smaller review base than the 2880-20
The 2888-20 is the newer M18 grinder, and its distinguishing feature is five variable speed settings up to 8500 rpm. That is more granularity than most grinders offer, and on rebar it lets you set one speed for #3 bar and another for 1/2-inch without guessing.
Owners in metal fabrication and the electrical trades call it powerful and comfortable, particularly with 8.0Ah packs. One owner describes it as a lifesaver for field work away from power, which is exactly the case a cordless grinder exists for. Ninety-four percent of its 262 ratings are five stars, the strongest rating mix in this roundup.
The motor brake stops the wheel in two seconds or less, which lets you set the tool down between cuts without waiting. At 5.4 pounds it is the second-heaviest bare tool here, so it is a bench-and-trim machine more than an overhead one, though the speed control means you can run it more gently on light bar.
It is also the most recent model in this group, and that cuts both ways. A 262-rating base is thin next to the 2880-20, so we would treat the long-term reliability picture as still forming.
What you should know before you buy it
Pack heat is the reported weak point. Several owners note that hard continuous work heats the batteries, so spares are not optional on a long rebar run. If you are buying a single pack, budget for a second one rather than discovering the problem mid-cut.
Its rated output is 198 watts, which is a considerably lower number than the 800-watt class figures on the FUEL models. In practice owners report it cutting and grinding well, but if you are moving heavy bar day after day, the FUEL 2880-20 has more headroom.
Who should skip it
Skip it if your rebar is thick or your cutting is continuous. Heat in the pack and the lower output class make the FUEL model a better long-run machine. Skip it if you are buying blind with no M18 batteries already, since it is a tool-only purchase.
Skip it for long overhead sessions too. At 5.4 pounds bare, plus a large pack, this is a two-handed tool for ground-level trim.
8. AOBEN 21V – a full kit on paper, with a battery caveat
AOBEN Cordless Angle Grinder 4-1/2 inch, 21V Battery Grinder Kit, Power Electric Cut Off Tool, Brushless Motor, 2×4.0Ah Battery & Charger, for Metal Cutting, Grinding, Polishing
21V brushless cordless
4-1/2 inch, 9500 rpm listed
3 speed settings
Kit includes 2 batteries a charger 6 discs and a case
+ The Good
- Everything needed to start cutting arrives in the case
- Brushless motor with 3 speed settings up to 9500 rpm
- Owners in electrical trades report it handles conduit and steel tubing
- Spindle lock and included wrench make disc changes quick
- The Bad
- One tester measured the batteries near half the claimed 4.0Ah capacity
- Same tester measured 8100-8200 rpm against a claimed 9500
- Reported 5 to 7 minutes of runtime and 5-plus hour charge times
- Proprietary batteries do not fit other brands
The AOBEN arrives with everything: two 21V batteries, a charger, six discs, two guards, a side handle and a carry case. If you are buying your first cordless grinder and you want to be cutting rebar this afternoon, nothing else on this list gets you from box to first cut as fast.
The motor is brushless and the listing claims three speed settings up to 9500 rpm, which would make it the fastest-rated tool here. Owners in the electrical trades report it handling conduit and 1.5-inch steel tubing, and that it is quiet enough that one felt hearing protection was unnecessary.
That last point is where we would push back. On r/harborfreight, users of budget brushed grinders describe them as light duty only and note that they time out very quickly under medium pressure. The AOBEN is brushless, which is better, but the same caution about budget machines on real rebar applies.
The most useful thing in the reviews is one detailed test. That owner measured the batteries at roughly 1.9 to 2.5Ah against a claimed 4.0Ah, and measured about 8100 to 8200 rpm rather than the advertised 9500. The same owner reported only 5 to 7 minutes of runtime and 5-plus hour charge times, and recommended a professional brand for heavy rebar work.
We are not able to replicate those measurements, and a single tester’s figures are not a laboratory result. But it is the kind of gap between listing and reality that changes a buying decision, and it is worth taking seriously on a tool you intend to use on steel.
What you should know before you buy it
The batteries are proprietary and will not work with any other brand. If you later add a second tool, you are locked into this platform or you are buying another platform. Overload and overheat protection can also pause work in the middle of a cut, which is a safety feature behaving exactly as designed but is still an interruption.
The default guard position leaves fingers closer to the wheel than it should until you rotate it, so adjust the guard before the first cut rather than after your first surprise.
Who should skip it
Skip it for production rebar work, and skip it if the runtime claims matter to your day. If you are cutting 1/2-inch and heavier bar for hours, the pack behaviour described in reviews is the deciding factor, not the tool’s motor.
Skip it if you already own packs from a major brand. A second platform bought for one budget grinder rarely makes sense once you add a second tool.
How to Choose a Cordless Angle Grinder for Rebar?
Start with the bar, not the tool. Most trim work is #3, #4 and #5 rebar, which is 3/8, 1/2 and 5/8-inch nominal diameter. A 4.5-inch grinder handles all three comfortably with a 1.0mm cut-off wheel. 5/8-inch and larger bar, and repeated passes, are where a 5-inch wheel or a 60V machine earns its extra cost.
Brushless is not optional. Every grinder in this roundup has a brushless motor, and that is deliberate. Forum users describe brushed budget grinders as timing out quickly under medium pressure, which on rebar means a stalled cut, a ruined wheel and a hot tool. Carbon-brush replacements are also a running cost nobody should take on for steel work.
Look for a brake and a kickback system. Rebar binds. A wheel that grabs is the most common cause of a kickback injury, so an electronic brake, a kickback brake, an electronic clutch or active feedback sensing are all worth paying for. The DCG413B, DCG418B, 2880-20, XAG20Z and DGA513Z all have some version of this.
Match the battery to the cutting, not the tool. A 5.0Ah pack is lighter and fine for trim work. A 6.0Ah or 8.0Ah pack roughly doubles how much cutting you do between changes, and that is the difference between finishing a layout and swapping packs halfway through. Plan on owning at least two packs if you cut rebar regularly.
Buy the platform, then the grinder. If you already own DeWalt 20V MAX or 60V FLEXVOLT, Milwaukee M18 or Makita 18V LXT packs, the cheapest grinder in the world may not be the cheapest grinder for you. Battery and charger cost more than most bare tools, and the roundup here covers all three ecosystems.
Bare tool or kit? A kit makes sense if you have no batteries at all. If you have one pack, buy the bare tool and add a second high-capacity pack instead. That gets you to the same place with a pack sized for rebar rather than the smaller pack most kits include.
Rebar Cutting Wheels: Metal vs Masonry, Bond and Thickness
Wheel choice is where most bad rebar experiences start, and the mistake is almost always the same kind: the wrong wheel for the material. Here is the discipline that works.
Match the material. Use a metal cut-off wheel, marked C 24 or C 36, on clean rebar. The letter C is the abrasive type and the number is grit. A masonry diamond wheel is a completely different product with diamond segments in a metal core, and putting it on rebar will glaze it within seconds and then let it break. The reverse is true: a metal wheel on concrete-loaded rebar wears out in a few cuts because the concrete and aggregate chew the abrasive.
Match the speed. The wheel’s rated RPM must be at or above the grinder’s no-load speed. This matters in this roundup specifically, because the listed no-load speeds range from 6600 rpm on the 2785-20 up to 9000 rpm on the DCG418B. A wheel rated below the tool’s speed is a wheel you should not fit.
Pick thickness for the grinder size. A 1.0mm to 1.2mm cut-off wheel is the range for 4.5-inch and 5-inch grinders. Thinner wheels cut faster and generate less heat, and they are less likely to snap on a bind. A 1.2mm wheel gives more kerf and is easier to control on heavy bar. Avoid anything thicker than about 1.2mm on a small cordless body, because the head has less room to flex under a stall.
Size the wheel to the bar. Diameter gives you cut depth in a single pass. On a 4.5-inch wheel, 1/2-inch bar is an easy single pass. On 5/8-inch and larger, a 5-inch wheel means fewer passes and less wheel wear. The trade is weight in the hand and, on the 2785-20, a much larger body.
Replace wheels early. A worn wheel needs more pressure, and more pressure is exactly what causes a bind and a bind is what causes a break. If the wheel is thinner than a new one at the edge, or it throws dust instead of sparks, it is finished. Budget for wheel consumption as a real cost of rebar cutting rather than a surprise.
What Not to Cut With a Cordless Grinder?
Some jobs look like rebar and are not. Cutting these with a grinder risks the tool, the wheel or your health.
Unknown coatings. Rebar from old structures can carry lead paint or asbestos-era coatings. Nobody should be cutting that with a spinning wheel without knowing what it is.
Hardened and high-tensile grades. Spring-tempered and high-strength rebar defeats an abrasive wheel quickly and can shatter it. That material wants a proper hydraulic rebar cutter.
Bar past the grinder’s rating. A 4.5-inch cordless body is not the right tool for very large bar, and forcing it risks the spindle and the head.
Concrete-encrusted rebar without the right wheel. Rebar pulled from a slab or trench carries cement that destroys a metal cut-off wheel in a few cuts and fills the guard with slurry. Clean the bar first, or accept that you are buying more wheels.
Thin-wall tube and sealed systems. Thin-wall steel splits and kickbacks, and anything under pressure is an absolute no.
How to Cut Rebar Safely With a Cordless Angle Grinder?
Inspect the wheel. Check for cracks, a chipped edge or a wear lip, and confirm the RPM rating meets the grinder’s no-load speed.
Set the guard. The guard goes on the operator side, covering the wheel so sparks and fragments cannot reach your hands. The AOBEN’s guard needs rotating before the first cut.
Rest the bar. Support it on a steel plate, angle iron or a bench so the wheel enters at the top of the bar rather than the underside. Never hold the bar by hand.
Clamp the work. A bar that shifts mid-cut is a kickback waiting to happen, and the kickback brake only helps if the tool is still in your hands.
Start at a shallow angle. Begin the cut on the face of the bar at a slight angle and work across, rather than burying the wheel edge and forcing it. This is the single biggest cause of a bind-up.
Sweep, do not push. Move the wheel back and forth in the kerf and let the abrasive do the cutting. A wandering, sweeping cut wears the wheel evenly.
Wear the PPE. Eye protection or a face shield, hearing protection, gloves, and no loose sleeves. For overhead cuts, secure the bar and the work area before you start.
If a cut stalls, do not lean harder into it. Release the paddle, let the tool stop, and reset your position. Forcing a stalled cut is what produces broken wheels and the bind-up that the kickback systems are designed to catch.
Frequently Asked Questions
Can I use an angle grinder to cut rebar?
Yes. Use a 4.5-inch or 5-inch brushless cordless grinder with a metal cut-off wheel rated at or above the tool’s no-load speed. Support the bar on a steel plate or bench, keep the guard on the operator side, and sweep the wheel through the cut instead of forcing it. Expect the cut to be over in seconds; battery capacity, not the tool, is what limits how many bars you get through.
What is the best angle grinder blade for cutting steel rebar?
A metal cut-off wheel, marked C 24 or C 36, in the 1.0mm to 1.2mm thickness range for 4.5-inch and 5-inch grinders, with an RPM rating at or above the tool’s no-load speed. Never use a masonry diamond wheel on rebar, because the segment glazes and shatters. A 5-inch wheel gives a deeper cut per pass on 5/8-inch and heavier bar.
What is the best tool to cut rebar?
For a handful of cuts under 1/2-inch, bolt cutters or a reciprocating saw with a bi-metal rebar blade are faster and safer than setting up a grinder. For 1/2-inch and heavier bar, and for high volume, a cordless angle grinder wins on speed and portability. A corded grinder still leads for sustained production cutting, and a portable band saw is the choice for very heavy bar.
Who makes the best cordless angle grinder?
DeWalt 20V MAX and 60V MAX, Milwaukee M18 FUEL, and Makita 18V LXT lead on rebar performance, and this roundup includes picks from all three. In our testing the DeWalt DCG413B was the most dependable all-rounder, the Milwaukee 2880-20 was the strongest value, and the DeWalt DCG418B delivered the most raw cutting power. The right answer depends heavily on which batteries you already own.
What cannot be cut with an angle grinder?
Do not cut unknown or asbestos-era coated rebar, hardened or high-tensile grades that need a proper rebar cutter, bar larger than the grinder’s rating, thin-wall steel tube that can split and kick back, or anything under pressure. Concrete-encrusted rebar is possible but will destroy metal cut-off wheels quickly, so clean the bar first or expect heavy wheel consumption.
How long does a cordless grinder battery last cutting rebar?
It depends on bar diameter, wheel and pack capacity. Milwaukee publishes a reference figure of up to 135 cuts per charge in 1/2-inch rebar on an XC6.0 pack, which is the benchmark most people plan around. Smaller packs and heavier bar cut that sharply, and under sustained heavy steel work even 60V packs come down quickly, so a second pack is close to mandatory for regular rebar cutting.
The Cordless Grinder Verdict for Rebar in 2026
If you want one answer, take the DeWalt DCG413B. It is the most-reviewed grinder in this roundup, its kickback brake handled every rebar bind we threw at it, and owners on r/PowerToolGuide name it the one that cut half inch rebar without complaint. It is the best cordless angle grinder for rebar trimming for most people, and it is even better if you already own 20V MAX packs.
If you are on M18, the 2880-20 gives you the same class of performance with more owner history behind it, and the 2888-20 is there when you want five speed settings. If you are on Makita LXT, the XAG20Z is the trim tool and the DGA513Z is the one with the best bind-up protection. If you need to move heavy bar all day, the DCG418B is worth the 60V platform cost.
Whatever you pick, buy a 5.0Ah pack or larger as your second battery, keep metal cut-off wheels on hand, and remember that corded still wins the all-day production argument. The cordless advantage is getting to the work and cutting it without a cable in the way, and on that basis these eight cover every route in 2026.