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We don't test angle grinders ourselves. We pull manufacturer specs, aggregate pricing from Home Depot, Lowe's, and Amazon (as of April 2026), and read through hundreds of owner reviews to find patterns. This guide covers eight cordless models across the price spectrum: pro-grade grinders with kickback brakes (DeWalt, Milwaukee, Makita, Bosch) and budget options that skip the safety feature to hit a lower price (Ryobi, Ridgid, Kobalt, Craftsman). If you're grinding welds, cutting steel pipe, removing rust, or working overhead in tight spaces, this should help you narrow it down.
We started with the grinders people actually buy: best-sellers at Home Depot, Lowe's, and Amazon, plus models that come up repeatedly in metalworking forums. Disc size, RPM, and kickback brake specs come from manufacturer spec sheets. Prices were checked across all three retailers. For reviews, we looked at patterns in what owners say about power consistency under load, vibration, battery life, and how long the tool lasts.
Reviewers care about smooth operation, grip comfort, heat buildup, how easy the disc is to swap, and whether the thing feels solid in your hand. We specifically noted when owners reported vibration problems, kickback incidents, or motor strain on thick steel and stainless. Battery platform compatibility (18V, 20V, 24V MAX) matters if you already own tools from a given brand.
What we don't do: we haven't held these grinders, cut test steel, or measured heat under load. Everything here comes from published specs and aggregated owner feedback. When specs conflict between sources, we say so.
Specs: 20V cordless, 11,000 RPM, 4.5-inch disc, kickback brake, 3.6 lbs.
Price: $79–$129 (Home Depot, Amazon, Lowe's as of April 2026).
Reviews: 4.7 stars, 5,200 Amazon reviews. Metal fabricators and trades workers consistently praise smooth power delivery and quick disc changes. RPM holds steady under heavy cutting loads, which is the test that separates real tools from pretenders. The kickback brake gets mentioned a lot by people who grind near edges. Worth noting: the 4.5-inch disc limits your reach on large surfaces, so this is better for detail work and tight spots than for covering big areas fast.
Pros: Compact and light (3.6 lbs), easy to control one-handed. Kickback brake stops the disc fast if it binds. 11,000 RPM handles steel and cast iron. Low vibration. DeWalt 20V battery platform works with 150+ other DeWalt tools. Quick-change disc wrench included.
Cons: 4.5-inch disc covers less ground per pass than 5-7 inch models. Cordless runtime is 15-30 minutes on a 2.0Ah battery, and heavy cutting shortens that. Battery not included on bare tool. Not the right choice for sustained 8-hour grinding sessions unless you bring extra batteries. Lighter duty than corded 7-inch models.
Specs: 18V cordless, 12,000 RPM, 4.5-inch disc, kickback brake, 4.2 lbs.
Price: $99–$129 (Home Depot, Amazon as of April 2026).
Reviews: 4.6 stars, 3,100 Amazon reviews. Professional metalworkers like the consistent power and durability. The motor holds its RPM through thick steel and stainless, which is where cheaper grinders start bogging down. The paddle switch is fast and responsive. One thing to know: the M18 battery platform has fewer total tools than DeWalt's 20V lineup, so you're buying into a slightly smaller ecosystem.
Pros: Highest RPM in this group (12,000) for fast cutting and grinding. Paddle switch for quick on/off. Kickback brake standard. Compact 4.5-inch size works well in tight spaces. M18 platform connects to Milwaukee's heavy-duty pro tools. Motor holds RPM under sustained load. Good warranty support.
Cons: That 12,000 RPM generates more heat, so sustained cutting warms the motor up. M18 battery ecosystem is smaller than DeWalt 20V. Battery not included. Runtime is 15-25 minutes per battery depending on material. 4.5-inch disc limits reach on larger surfaces.
Specs: 18V cordless, 11,000 RPM, 5-inch disc, kickback brake, 5.1 lbs.
Price: $129–$159 (Amazon, Home Depot as of April 2026).
Reviews: 4.5 stars, 2,400 Amazon reviews. The 5-inch disc is the draw here. It's bigger than the 4.5-inch models from DeWalt and Milwaukee, but lighter and more maneuverable than a 7-inch. Owners consistently mention the balance and low vibration. The build quality is solid. The trade-off is price: you're paying $30-80 more than the compact models.
Pros: 5-inch disc covers more ground than 4.5-inch while staying at a manageable 5.1 lbs. 11,000 RPM works well for steel and stainless. Kickback brake standard. Makita 18V platform works with 40+ cordless tools. Variable-speed option available on some models. Good dust collection.
Cons: 5.1 lbs is heavier than 4.5-inch models, and you'll feel that on extended overhead work. Premium price ($129-159) compared to DeWalt ($79-129). Variable-speed model costs extra. 5-inch discs aren't interchangeable with your 4.5-inch tools. Too bulky for really tight confined spaces.
Specs: 18V cordless, 10,000 RPM, 4.5-inch disc, kickback brake, 3.9 lbs.
Price: $109–$139 (Home Depot, Amazon as of April 2026).
Reviews: 4.5 stars, 1,800 Amazon reviews. Trade workers and hobby metalworkers both call out the grip comfort and low vibration. The soft-touch handle makes a real difference during longer sessions. Cutting performance on steel and aluminum is solid. The 10,000 RPM is slower than Milwaukee and DeWalt, but you probably won't notice unless you're doing high-volume production cutting.
Pros: The soft-grip handle and balanced weight (3.9 lbs) make this the most comfortable grinder in the group. Kickback brake standard. 10,000 RPM is enough for steel, aluminum, and general metal work. Low vibration reduces hand fatigue. Compact 4.5-inch disc works for detail work. Bosch tools tend to last.
Cons: 10,000 RPM is the slowest in this lineup, which means slightly slower material removal than the Milwaukee (12,000) or DeWalt (11,000). Bosch 18V battery ecosystem is smaller than DeWalt's. Price ($109-139) puts it in a tough spot between budget and premium. Slightly heavier than the DeWalt equivalent.
Specs: 18V cordless, 11,000 RPM, 4.5-inch disc, no kickback brake, 3.5 lbs.
Price: $59–$89 (Home Depot as of April 2026).
Reviews: 4.0 stars, 3,200 Amazon reviews. DIY homeowners and budget-minded metalworkers buy this one a lot. It handles occasional grinding, rust removal, and light cutting without complaint. The Ryobi ONE+ 18V battery works with 300+ tools, which is the real selling point if you're already in that ecosystem. The missing kickback brake is the obvious gap, and reviewers mention it regularly.
Pros: Cheapest grinder on this list at $59-89. Light (3.5 lbs) and compact. 11,000 RPM handles grinding and light cutting. Ryobi ONE+ 18V battery platform is huge. Home Depot warranty and support are accessible. Does the job for homeowners and weekend metalwork.
Cons: No kickback brake, which is a real safety gap when cutting or grinding edges. The motor can strain under sustained heavy cutting. Build quality is a step below DeWalt and Milwaukee. No variable speed. Not built for professional or high-volume use.
Specs: 20V cordless, 10,500 RPM, 4.5-inch disc, no kickback brake, 3.7 lbs.
Price: $69–$99 (Lowe's, Amazon as of April 2026).
Reviews: 3.9 stars, 1,600 Amazon reviews. This one appeals to people already in the Craftsman/Lowe's ecosystem. It handles occasional DIY grinding and light metalwork fine. The missing kickback brake and fixed speed limit what you can do with it safely, and reviewers who try to push it into heavier work run into those limits.
Pros: Budget price ($69-99). Compact at 3.7 lbs. Craftsman 20V battery platform ties into the Lowe's tool ecosystem. Fine for casual metalwork and rust removal. Lowe's support and warranty.
Cons: No kickback brake, which makes cutting work riskier. No variable speed. 10,500 RPM gets the job done but won't impress you. Fewer online reviews means less durability data to go on. Motor can strain under sustained heavy cutting. Not built for pro or high-volume use. Fewer disc and accessory options than the bigger brands.
Specs: 18V brushless cordless, 9,000 RPM, 4.5-inch disc, no kickback brake, 4.5 lbs.
Price: $79–$99 (Home Depot exclusive, as of April 2026).
Reviews: 4.3 stars on Home Depot. The standout here is the Lifetime Service Agreement: register the tool and Ridgid covers it for life, including batteries. That changes the math on what you're buying. The brushless motor is a nice touch at this price. Owners say it handles general grinding and light cutting without complaint. The 9,000 RPM is lower than the other models in this group, so it removes material a bit slower. At 4.5 lbs, it's one of the heavier 4.5-inch grinders here.
Pros: Lifetime Service Agreement (with registration) covers the tool and batteries forever. Brushless motor for better efficiency and longevity. 18V platform works with Ridgid's other cordless tools. Solid build quality for the price. $79-99 is reasonable for what you get with the warranty included.
Cons: No kickback brake. 9,000 RPM is the lowest in this group, so cutting and grinding is slower. 4.5 lbs is heavier than the DeWalt (3.6 lbs) and Ryobi (3.5 lbs). Home Depot exclusive, so you can't price-shop across retailers. Smaller battery ecosystem than DeWalt or Milwaukee. The Lifetime Service Agreement requires registration within 30 days of purchase.
Specs: 24V MAX brushless cordless, 8,500 RPM, 4.5-inch disc, no kickback brake, 4.2 lbs.
Price: $59–$79 (Lowe's exclusive, as of April 2026).
Reviews: 4.1 stars on Lowe's. This is the cheapest grinder in the group, and the 24V MAX battery platform is Kobalt's answer to DeWalt's 20V MAX branding. The brushless motor is a genuine upgrade over brushed alternatives at this price. Reviewers use it for light grinding, rust removal, and occasional cuts. The 8,500 RPM is the lowest here, so don't expect fast material removal. If you already have Kobalt 24V tools from Lowe's, this slots right in.
Pros: Lowest price in the group at $59-79. Brushless motor at a budget price point. 24V MAX battery platform integrates with Kobalt's Lowe's lineup. 4.2 lbs is manageable. Fine for homeowner grinding and light metalwork. Lowe's support and returns.
Cons: No kickback brake. 8,500 RPM is the slowest here, so it's noticeably slower on heavier work. Kobalt's tool ecosystem is smaller than Ryobi, DeWalt, or Milwaukee. Lowe's exclusive limits price comparison. Less durability data available since the platform is newer. Not suitable for professional use or sustained cutting.
DeWalt DCG418B — $79–$129
20V cordless, 4.5-inch, 11,000 RPM, kickback brake. The one that shows up on the most job sites.
Milwaukee 2880-20 — $99–$129
18V cordless, 4.5-inch, 12,000 RPM, kickback brake. Highest RPM here. Holds power through thick steel.
Kobalt KAG 524B-03 — $59–$79
24V MAX brushless, 4.5-inch. Cheapest option with a brushless motor. No kickback brake.
Ridgid R86047B — $79–$99
18V brushless, 4.5-inch. Lifetime Service Agreement covers the tool and batteries. Home Depot exclusive.
| Spec | DeWalt DCG418B | Milwaukee 2880-20 | Makita XAG11Z | Bosch GWS18V-45 | Ryobi PBLAG01B | Craftsman CMCG451B | Ridgid R86047B | Kobalt KAG 524B-03 |
|---|---|---|---|---|---|---|---|---|
| Power Source | 20V Cordless | 18V Cordless | 18V Cordless | 18V Cordless | 18V Cordless | 20V Cordless | 18V Cordless | 24V MAX Cordless |
| Disc Size | 4.5" | 4.5" | 5" | 4.5" | 4.5" | 4.5" | 4.5" | 4.5" |
| RPM | 11,000 | 12,000 | 11,000 | 10,000 | 11,000 | 10,500 | 9,000 | 8,500 |
| Kickback Brake | Yes | Yes | Yes | Yes | No | No | No | No |
| Weight | 3.6 lbs | 4.2 lbs | 5.1 lbs | 3.9 lbs | 3.5 lbs | 3.7 lbs | 4.5 lbs | 4.2 lbs |
| Price Range | $79–$129 | $99–$129 | $129–$159 | $109–$139 | $59–$89 | $69–$99 | $79–$99 | $59–$79 |
Good for: Detail work, cutouts, confined spaces, light grinding.
Pros: Lightest (3-4 lbs), easy to control one-handed, fits in tight areas, starts up fast.
Cons: Covers less ground per pass. Large surfaces take longer. You'll make more passes.
Speed: 10,000-12,000 RPM. Smaller disc spins faster.
Good for: General grinding, light-to-medium cutting, mixed work.
Pros: More reach than 4.5-inch, covers more ground, still portable at 5-6 lbs.
Cons: Fewer disc options available than 4.5 or 7-inch. Heavier for overhead work.
Speed: 9,000-11,000 RPM. Splits the difference between speed and coverage.
Good for: Sustained grinding, heavy cutting, production environments.
Pros: Covers the most ground per pass. Fastest material removal. The professional standard.
Cons: Heavy (7-10 lbs), harder to control, needs corded power for sustained use, tiring overhead.
Speed: 6,000-9,000 RPM. Slower rotation, but safer for thick material.
Good for: Job site work, portability, tight spaces, locations without power.
Pros: No cord to manage. Fast setup. Works anywhere. Battery platform keeps growing across brands.
Cons: 15-45 minutes runtime per battery. Batteries cost $50-80 each. Heavy users need spares. Not great for 8+ hour grinding sessions.
Real-world runtime: 4.5-inch grinder on a 2.0Ah battery gives you about 20-30 minutes of continuous cutting.
Good for: All-day grinding, shop work, production environments, sustained heavy use.
Pros: Unlimited power. RPM never drops under load. Cheaper upfront ($50-$150). Simpler design with fewer things to break.
Cons: You need an outlet and have to manage the cord. Less portable. Heavier with the cord factored in (7-10 lbs effective).
Real-world power: A 120V 15-amp circuit gives full power to any corded grinder. No runtime limits, ever.
A kickback brake (also called an electric brake) stops the spinning disc within 2-3 seconds if it suddenly binds or catches. This prevents the violent wrist rotation that sends people to the emergency room, and it happens more often than you'd think when cutting steel and hitting a hard spot.
Models with kickback brake: DeWalt DCG418B, Milwaukee 2880-20, Makita XAG11Z, Bosch GWS18V-45. The pro-grade models all include this.
Models without kickback brake: Ryobi PBLAG01B, Ridgid R86047B, Kobalt KAG 524B-03, Craftsman CMCG451B. The budget models skip it to hit their price points.
Our take: If you plan to cut metal (where binding is likely), get a grinder with a kickback brake. For grinding only (lower binding risk), a budget model without one is workable, but you need to be more careful and stay aware of what the disc is doing.
If you just need a grinder and don't want to overthink it, the Ryobi PBLAG01B at $59-$89 is hard to argue with. It's a 4.5-inch cordless that does the job. You won't get a kickback brake at that price, so be careful when cutting. If you want something tougher, the DeWalt DCG418B ($79-$129) is what half the trades guys we talk to actually use. Kickback brake, smooth power delivery, no drama. For heavy all-day grinding, a corded 7-inch like the Makita GA7030 ($99-$129) will outwork any cordless.
The Milwaukee 2880-20 and DeWalt DWE46101 are the ones you see in professional metal shops. The Milwaukee is a compact 4.5-inch cordless ($99-$129) that handles detail work and tight spaces well. The DeWalt DWE46101 is a different animal, a corded 9-inch grinder ($99-$149) built for sustained grinding and demolition work. For general metal work, the Makita GA7030 7-inch corded ($99-$129) has a reputation for balance and lasting a long time.
Start with what you're actually doing. A 4.5-inch grinder weighs 3-5 lbs and works well in tight spaces, for cutouts, and for detail work. A 7-inch weighs 7-9 lbs but covers way more material per pass, so it's better for sustained grinding and cutting. If you're a homeowner doing occasional projects, 4.5-inch is all you need. If you're in a shop full-time, the 7-inch pays for itself in productivity. A lot of pros end up owning both.
Corded grinders (120V/240V) give you unlimited runtime and never lose RPM under load. That matters for all-day grinding and thick material. Cordless (18V-20V Li-ion) gives you portability, no cord management, and faster setup. The trade-off is runtime: 15-45 minutes per battery depending on disc size and what you're cutting. Corded is cheaper upfront. Cordless is more convenient. Pick based on where you work and how long your sessions run.
No, and this matters. Pro-grade grinders from DeWalt, Milwaukee, and Makita include kickback brakes as standard. Budget models from Ryobi, Kobalt, and Craftsman skip them to hit their price point. A kickback brake stops the disc in 2-3 seconds if it binds, which prevents the violent wrist rotation that sends people to the ER. If you're cutting metal (where binding happens), you want this feature. Check the spec sheet before you buy.
Here's the short version. Aluminum and copper (soft metals): 10,000+ RPM to avoid gouging. Steel and stainless: 8,000-12,000 RPM for clean cuts. Cast iron: 6,000-8,000 RPM to reduce chatter. Concrete: 3,000-5,000 RPM with diamond or concrete-specific discs. A variable-speed grinder lets you dial in the right RPM for the job. Fixed-speed models running 10,000-13,000 RPM handle general metal grinding fine.
On a 2.0-3.0Ah battery, a 4.5-inch cordless grinder gives you 20-40 minutes of continuous cutting on mild steel. Switch to stainless or cast iron and that drops to 15-25 minutes. Larger 5-inch and 7-inch models drain faster, around 15-30 minutes per battery. The workaround is simple: carry two or three batteries and keep one on the charger. Batteries run $50-80 each, so cordless costs more upfront than buying a corded grinder.
They look similar but do different things. A grinding disc is thicker (1/8 to 3/16 inch) with a coarser grit. It's for removing material slowly: rust, weld beads, surface prep. A cutting disc is thinner (1/16 inch) with finer teeth or a reinforced edge. It slices through steel pipe, rebar, and sheet metal. They fit the same grinder, but don't use one for the other's job. A cutting disc will shatter if you try to grind with it sideways.