10 min read
Last verified September 15, 2026
Picking between DeWalt's 20V MAX and 60V MAX angle grinders is a battery decision first. FLEXVOLT packs run tools on both platforms, so the questions that actually settle it are which packs you'll own and whether your work needs wheels bigger than 4-1/2 in. If it doesn't, 20V MAX covers the job.
Bottom line
Choose 20V MAX if your grinding stays at 4-1/2 in. or 5 in. and you already own 20V packs. Choose 60V MAX if you need a 6 in. or 7 in. wheel, and buy FLEXVOLT packs, which switch voltage automatically and run both platforms. Wheel capacity decides this, not the number on the battery.
What do the 20V and 60V labels actually mean?
They're peak ratings, not working ones. DeWalt states that 20V MAX maximum initial battery voltage, measured without a workload, is 20 volts, with a nominal voltage of 18. A FLEXVOLT pack in a 60V MAX tool reaches a maximum initial 60 volts, nominal 54. So the honest framing is 18 volts nominal against 54, and the difference shows up in how much wheel the tool can carry.
| Platform | Max initial voltage, no load (V) | Nominal voltage (V) | Packs that run it | Grinder wheel capacity in our lineup |
|---|---|---|---|---|
| 20V MAX | 20 | 18 | 20V MAX packs or FLEXVOLT | 4-1/2 in. to 5 in. |
| 60V MAX | 60 | 54 | FLEXVOLT only | 4-1/2 in. to 7 in. |
One label trap sits in the listings themselves. The DCG416B reads as a 20V MAX FLEXVOLT grinder while its catalog platform field says DeWalt 20V MAX, so the word FLEXVOLT in a grinder title doesn't make it a 60V tool. Our 60V grinders also appear under two platform labels, DeWalt 60V MAX and DeWalt 60V MAX FLEXVOLT, so filter on either when you shop.
Will one battery run both platforms?
A FLEXVOLT pack will; a 20V MAX-only pack won't. DeWalt's own wording is direct: FLEXVOLT batteries "automatically switch voltages when you change your tools," powering both 20V MAX and 60V MAX tools. That applies to FLEXVOLT-branded packs only, so the standard 20V packs in your bag today run your 20V grinder and nothing on the 60V side.
That crossover runs one direction, which is worth planning around. A FLEXVOLT pack bought for a 60V grinder also feeds your 20V MAX drill, impact, and light. A 5.0Ah 20V pack bought for the drill does nothing for a 60V grinder. If you expect to own even one 60V tool, its pack becomes the one you reach for across the rest of the kit.
Does stepping up to 60V make the wheel spin faster?
No. DeWalt rates the 60V MAX DCG418 at a no-load speed of 9,000 RPM from its 13 amp motor, and our catalog lists the 20V MAX DCG408B at 9,000 RPM as well. Both platforms land on the same no-load figure, so RPM isn't the spec that separates them. Voltage buys power under load and larger wheel capacity instead.
Inside the 60V line, power does move with the pack. DeWalt rates the DCG418 with a DCB609 FLEXVOLT battery at up to 30% more power than the DCG414 with a DCB606 battery, which makes the pack part of the spec rather than an accessory. Pick the pack capacity with the tool, not after it.
How big a wheel does each platform take?
Wheel capacity is where the two platforms genuinely part ways. On 20V MAX, the DeWalt DCG408B 20V MAX Brushless 4-1/2 in. Grinder takes a 4-1/2-inch wheel, and the DCG410VSB covers 4-1/2-inch to 5-inch wheels.
On 60V MAX, the DCG418 is a 4-1/2-inch to 6-inch grinder, and the DeWalt DCG440B 60V MAX 7 in. Grinder with DCB609 battery takes a 7-inch wheel. Among the 20V MAX grinders we list, 5-inch is the top of the range.
 DeWalt DCG408B 20V MAX Brushless Cordless 4 1/2 in. Paddle-Switch Grinder (Tool Only)$119.00
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 DeWalt DCG440B 60V MAX* 7 in. Grinder w/ FREE DCB609 20V/60V MAX 9.0AH Battery$317.69
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|---|---|---|
| Battery platform | 20V MAX | 60V MAX, FLEXVOLT pack required |
| Wheel capacity | 4-1/2-inch | 7-inch |
| Motor | Brushless | Brushless |
| Battery in the listing | Tool only | DCB609 20V/60V MAX 9.0Ah included |
| Better suited for | 4-1/2-inch grinding and cut-off on an existing 20V kit | Work that calls for a 7-inch wheel |
The DCG408B is the grinder buyers here order more often than any other in the category, and on the 60V side the DCG440B outsells the 4-1/2 in. to 6 in. DCG418B. Those two picks sit at opposite ends of the same decision: small-wheel work stays on 20V, and the reason people cross to 60V is usually a bigger wheel.
Does the kickback brake differ between the platforms?
It's shared, not a platform split. DeWalt describes a kickback brake that engages when a pinch, stall, or bind-up event is sensed, with the electronic brake engaging at maximum force to stop the wheel, reduce movement of the grinder, and shut the grinder off. On the 20V side, DeWalt states the DCG413's brake stops the wheel in 2 seconds or less on average, a figure the manufacturer gives as an average. The same system description covers kickback-brake models on both platforms, so it won't decide the purchase either way.
What's in the box, and which pack comes with it?
Kit contents move your real outlay more than the tool spec does. DeWalt lists the DCG418X1 kit with a DCB609 FLEXVOLT 9.0Ah battery, a 4-1/2 in. (115mm) Type 27 guard, a 6 in. (150mm) Type 27 guard, a charger, and a kit bag. Both guards ship in that box, which is how one tool covers both wheel sizes as DeWalt supplies it.
The 60V grinder bundles we list pair the tool with a FLEXVOLT pack: the DCG440B listing includes a DCB609 9.0Ah, and the DCG418B bare-tool listing includes a DCB606 6.0Ah. The 20V kit we list pairs the DCG410VSB with a DCB205-2C 5Ah battery kit. Tool-only versions exist on both platforms for anyone who already owns packs.
Which platform fits your work?
Pick on wheel size first, pack family second, price tier last. If your grinding lives at 4-1/2-inch wheels and you own 20V packs, 20V MAX is the cheaper answer and keeps one battery family in the bag.
If you're cutting or grinding with 6-inch or 7-inch wheels, 60V MAX is the only side of the lineup that reaches, and its FLEXVOLT pack backfills your 20V tools.
We sell every DeWalt grinder named here, so treat these picks as what matches the job rather than what carries the biggest number. Returns run a little higher across the 60V cordless tools we ship than across the 20V ones, which argues for stepping up when wheel capacity calls for it instead of buying the bigger platform as insurance.
- Best for 4-1/2 in. grinding and cut-off on an existing 20V kit: DeWalt DCG408B Brushless 4-1/2 in. tool at 9,000 RPM on the 20V MAX packs you already own.
- Best for Variable speed and 5 in. wheels without leaving 20V: DeWalt DCG410VSB 4-1/2 in. to 5 in. capacity with variable speed, still on 20V MAX XR packs.
- Best for Dedicated 4-1/2 in. cut-off work at the lowest buy-in: DeWalt DCG412B Entry-tier 4-1/2 in. cut-off tool on the 20V MAX platform.
- Best for Work that needs a 7 in. wheel: DeWalt DCG440B with DCB609 battery 7 in. capacity on 60V MAX, and the included DCB609 FLEXVOLT pack also runs 20V MAX tools.
- Best for One pack family across both platforms: FLEXVOLT packs (DCB606 or DCB609) FLEXVOLT switches voltage automatically, so the same battery powers 20V MAX and 60V MAX tools.
Key Takeaways
- FLEXVOLT packs run both 20V MAX and 60V MAX tools; standard 20V MAX packs run 20V tools only.
- Nominal voltage is 18 on 20V MAX and 54 on FLEXVOLT. The MAX figures are no-load peaks measured without a workload.
- No-load speed doesn't separate the platforms: DeWalt rates the 60V DCG418 at 9,000 RPM, and our catalog lists the 20V DCG408B at 9,000 RPM.
- Wheel capacity does separate them: 4-1/2 in. to 5 in. across the 20V grinders we list, up to 7 in. on 60V MAX with the DCG440B.
- Kickback brake and shutdown behavior show up on models across both platforms, so it won't break the tie.
- Read the platform field on a listing. A FLEXVOLT mention in a grinder title doesn't always mean a 60V tool.
Can I run a 60V MAX grinder on my 20V MAX batteries?
Only if those packs are FLEXVOLT. DeWalt's FLEXVOLT batteries use patented technology that automatically switches voltages when you change tools, so one pack powers both 20V MAX and 60V MAX tools. A standard 20V MAX-only pack has no 60V mode and won't start a 60V MAX grinder. Buying into 60V means buying at least one FLEXVOLT pack.
Does a 60V grinder spin faster than a 20V one?
No. DeWalt rates the 60V MAX DCG418 at a no-load speed of 9,000 RPM from its 13 amp motor, and our catalog lists the 20V MAX DCG408B at 9,000 RPM too. Higher voltage shows up as power available under load and in larger wheel capacity, not in a faster spindle. Match the wheel size to the work, then pick the platform.
Why does DeWalt say 20V on the pack and 18V in the specs?
They describe the same battery. DeWalt states that 20V MAX maximum initial battery voltage, measured without a workload, is 20 volts, and that nominal voltage is 18. FLEXVOLT follows the same pattern: 60 volts maximum initial, 54 nominal. So a 20V MAX pack and an 18V rating aren't two products, and neither number tells you what wheel the tool takes.
Is a grinder labeled FLEXVOLT always a 60V tool?
No. Our catalog lists the DCG416B as a 20V MAX FLEXVOLT grinder while its battery platform field reads DeWalt 20V MAX, so that title wording doesn't make it a 60V tool. Check the platform field before ordering. Our 60V grinders also sit under two labels, DeWalt 60V MAX and DeWalt 60V MAX FLEXVOLT, so search both when you filter.
What wheel sizes do the 20V and 60V grinders take?
The 20V MAX grinders we list run 4-1/2 in. to 5 in.: the DCG408B is a 4-1/2 in. tool, and the DCG410VSB covers 4-1/2 in. to 5 in. On 60V MAX, the DCG418 is a 4-1/2 in. to 6 in. grinder and the DCG440B takes a 7 in. wheel. Wheel capacity, not voltage, usually decides the buy.
How quickly does the brake stop the wheel?
DeWalt states that the DCG413 20V MAX XR grinder's brake stops the wheel in 2 seconds or less on average. The company also describes a kickback brake that engages when a pinch, stall, or bind-up event is sensed, engaging the electronic brake at maximum force to stop the wheel, reduce grinder movement, and shut the grinder off. Both platforms carry that system.
What comes in the DCG418X1 60V kit?
DeWalt lists the DCG418X1 kit with a DCB609 FLEXVOLT 9.0Ah battery, a 4-1/2 in. (115mm) Type 27 guard, a 6 in. (150mm) Type 27 guard, a charger, and a kit bag. Both guards ship together, which is how the tool covers both wheel sizes as supplied. Tool-only versions skip the pack for anyone who already owns FLEXVOLT batteries.
Which grinder makes sense as a first cordless grinder?
A 4-1/2 in. 20V MAX paddle-switch tool. The DCG408B is the grinder buyers here order more often than any other in this category, it's brushless at 9,000 RPM, and it runs the same 20V packs as the rest of a 20V kit. Move to 60V MAX when a 6 in. or 7 in. wheel forces the change.