Milwaukee 2780-20 vs DeWalt DCG413: Cordless Angle Grinders Compared
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Angle grinders are the most dangerous cordless tool you'll own, so the safety features matter as much as the specs. The Milwaukee 2780-20 and DeWalt DCG413 both run 4-1/2 to 5-inch discs on brushless motors. Both have electronic brakes. The difference is in how they protect you when things go wrong.
Quick Verdict
The Milwaukee 2780-20 is the safer grinder with its RAPIDSTOP dual brake and paddle switch lock-off. For professional use where you're grinding every day, the safety margin is worth the extra $10 and 0.2 lb. The DeWalt DCG413 is faster, lighter, and cheaper, which makes it the better pick for occasional metal work and DIY projects where the kickback brake provides enough protection.
RAPIDSTOP and paddle lock-off provide the best safety package. When you run a grinder 8 hours a day, that matters.
9,000 RPM cuts metal faster. The kickback brake still protects you if the disc binds.
Lighter and faster for detail work that doesn't involve the same kickback risk as metal cutting.
Dual brake + lock-off paddle = less chance of a runaway disc if you lose grip.
Specs at a Glance
| Spec | Milwaukee 2780-20 | DeWalt DCG413 |
|---|---|---|
| Disc Size | 4-1/2 in to 5 in | 4-1/2 in to 5 in |
| No-Load Speed | 8,500 RPM | 9,000 RPM |
| Spindle Thread | 5/8-11 in | 5/8-11 in |
| Battery Platform | 18V (M18) | 20V MAX |
| Weight (bare) | 4.6 lb (bare) | 4.4 lb (bare) |
| Brake Type | Electronic + mechanical | Electronic brake |
| Guard Adjustment | Tool-free adjustable | Tool-free adjustable (one-touch) |
Milwaukee 2780-20
Price: $159 (Home Depot)
Pros
- RAPIDSTOP brake halts the disc in under 2 seconds after releasing the trigger
- Paddle switch with lock-off prevents the grinder from starting accidentally in your bag
- Overload protection shuts the motor down before it burns out under heavy load
Cons
- 8,500 RPM is slower than the DeWalt, noticeable on metal cutting
- 4.6 lb bare is on the heavier side for extended one-handed grinding
- Lock-off paddle requires a deliberate two-step activation that takes getting used to
DeWalt DCG413
Price: $149 (Home Depot)
Pros
- 9,000 RPM cuts through rebar and angle iron faster than the Milwaukee
- 4.4 lb is light enough for extended one-handed use on metal prep
- Kickback brake activates automatically if the disc binds in a cut
Cons
- No mechanical brake backup, relies entirely on electronic braking
- Trigger lock-on can be accidentally engaged, though it releases easily
- Electronic brake takes slightly longer to stop the disc than Milwaukee's RAPIDSTOP
Best For
Professional metalwork (daily use)
Milwaukee 2780-20
RAPIDSTOP and paddle lock-off provide the best safety package. When you run a grinder 8 hours a day, that matters.
Cutting rebar and angle iron
DeWalt DCG413
9,000 RPM cuts metal faster. The kickback brake still protects you if the disc binds.
Tile edge grinding and mortar removal
DeWalt DCG413
Lighter and faster for detail work that doesn't involve the same kickback risk as metal cutting.
Safety-critical environments (confined spaces, overhead)
Milwaukee 2780-20
Dual brake + lock-off paddle = less chance of a runaway disc if you lose grip.
Frequently Asked Questions
What's the difference between a kickback brake and a disc brake?
A kickback brake detects when the disc suddenly stalls or changes direction (binding in material) and shuts the motor down. A disc brake stops the disc from spinning after you release the trigger. The Milwaukee has both. The DeWalt has a kickback brake and an electronic disc brake.
Can I use a 6-inch disc on either of these?
No. Both are rated for 4-1/2 to 5-inch discs only. Running an oversized disc exceeds the guard coverage and RPM rating, which is a serious injury risk.
Do I need a grinder for tile cutting?
A wet tile saw is better for straight cuts. An angle grinder with a diamond blade is what you need for notches, L-cuts, and outlet cutouts where a tile saw can't reach.
How long does a battery last while grinding?
Grinding is one of the most power-hungry tasks for cordless tools. On a 5.0Ah battery, expect 15 to 25 minutes of continuous grinding depending on material and pressure. Bring spare batteries.