Corded angle grinders deliver continuous 11-amp power while cordless versions offer portability at 20V to 60V.
Choosing between a corded and cordless angle grinder comes down to one question: where will you work? A corded model like the DEWALT DWE402K runs at 11,000 RPM for as long as you hold the trigger, with no battery to die mid-cut. Cordless grinders free you from the outlet but tie you to a battery platform and its charging schedule. For garage work, metal fabrication, or any job where you’ll grind for more than a few minutes at a stretch, corded wins on stamina alone. If you’re cutting tile on a roof, trimming rebar in a ditch, or working anywhere without power nearby, cordless is the only option that actually works.
What’s Different Under The Guard
The core difference is power delivery. Corded grinders plug into your wall and draw steady current — the DWE402K pulls 11 amps, and the larger DWE43116 pulls 13 amps, both spinning at 11,000 RPM. That power never fades, so a corded grinder keeps the same cutting speed on the last pass as the first.
Cordless grinders swap amperage for voltage and battery chemistry. DEWALT offers four separate platforms — 20V MAX, ATOMIC 20V MAX, 60V MAX FLEXVOLT, and 54V XR FLEXVOLT — and they are not interchangeable.
Brushless motors matter in cordless tools. Models like the DCG408B use brushless motors that run cooler and last longer than the brushed DCG412B, which matters when battery life is your ceiling.
Battery Or Outlet: The Real Trade-Offs
Corded grinders win on runtime and weigh less — no battery pack hanging off the handle — and cost less to maintain since you never replace batteries. Their cord can snag, and their reach is limited by your extension cord. Cordless grinders win on mobility and safety. No cord means no tripping hazards and no accidental unplugging. But most cordless listings are tool only — the DCG412B, DCG408B, DCG402B, and DCG410VSB ship without a battery or charger. Factor that cost into your decision. The DCG410VSB runs 9,000 RPM with variable speed, and the DCG418B adds a kickback brake that stops the wheel fast when the tool bucks.
OSHA’s angle grinder guidance covers both types equally: eye and face protection, gloves, natural fiber clothing, an apron, and respiratory protection where debris flies. PPE is not optional on either platform.
Accessory Fit: Check The Arbor Before You Buy
Wheels and discs must match your grinder’s arbor. Most 4-1/2-inch models use a 5/8-in. arbor. A disc that doesn’t fit the arbor is useless — and forcing it is dangerous. Match the wheel’s rating to the grinder’s RPM. A wheel rated below 11,000 RPM on a grinder spinning that fast can shatter.
| Key Spec | Corded (DWE402K / DWE43116) | Cordless (DCG418B / DCG460X2) |
|---|---|---|
| Power source | Electric cord, AC/DC | 20V–60V battery |
| Motor output | 11–13 amps | Up to 13 A equivalent |
| No-load speed | 11,000 RPM fixed | 9,000 RPM (variable on DCG410VSB) |
| Runtime | Unlimited while plugged | Limited by battery capacity |
| Weight | Lighter without battery | 4.85–6.6 lb with battery |
| Safety features | Dust ejection on select models | Kickback brake, electronic clutch, soft start |
| Best for | Continuous grinding, fabrication, shop use | Portable jobs, tight spaces, no outlet nearby |
If you’re ready to buy and want a shop-tested pick, our roundup of the best corded grinders for heavy use compares the top models side by side. For portability, look at DEWALT’s 60V MAX line with its protection features.
Which One Should You Actually Buy
Buy corded if you grind daily, work near an outlet, or cut thick steel regularly. The 13-amp DWE43116 gives you the most headroom, and the 11-amp DWE402K covers most shop tasks. Buy cordless if you work on job sites, do quick cuts, or need to reach places without power.
Two mistakes sink most buyers. First, confusing a tool-only listing with a full kit — many cordless grinders arrive with no battery or charger, adding $100–$200 to the real price. Second, buying into the wrong voltage platform. If you already own 20V MAX tools, a 20V MAX grinder shares your batteries; if you’re starting fresh, the 60V MAX line offers the best performance with the protection features corded users expect.
FAQs
Are cordless angle grinders as powerful as corded ones?
A corded grinder sustains full power indefinitely, while a cordless unit’s output drops as the battery drains. For occasional cuts and portability, cordless power is plenty. For continuous heavy grinding, the corded tool still wins.
Can I use the same discs on corded and cordless grinders?
Usually, yes, as long as the arbor size matches. Most 4-1/2-inch grinders accept a 5/8-in. arbor, so discs transfer between them. Always check the wheel’s maximum rated RPM against your grinder’s no-load speed. Using a disc rated below your grinder’s speed risks shattering the wheel at high rotation.
Why do cordless grinders cost more than corded ones?
The battery and charger add real cost. A tool-only cordless grinder is often priced close to a corded kit, but you still need batteries and a charger, which can double your outlay. Corded grinders also lack the electronics, brushless motors, and protection circuitry that drive up cordless prices.
References & Sources
- OSHA. “Angle Grinder Toolbox Talk.” Details required PPE including eye/face protection, gloves, and respiratory protection.
- DEWALT. “DCG408B 20V MAX Brushless Cordless 4-1/2″ Paddle-Switch Grinder.” Documents cordless operation and tool-only configuration.
- DEWALT Global. “DCG460X2-QW 54V XR FLEXVOLT 230mm Angle Grinder.” Documents the first 230mm cordless grinder with electronic brake and kickback brake.