The DEWALT DWE402 is the angle grinder I use whenever I need to grind, cut, or polish anything metal. After 18 months of regular use, the grinder has cut rebar for landscape edging, ground welds smooth on a small steel gate I built, removed rust from cast iron, cut Hardiebacker for tile installs, and chamfered concrete edges on a small patio repair. Through all of it, the motor has not slowed, the paddle switch has not stuck, and the keyless guard still adjusts in seconds.
Why you should trust this review
I run a small commercial remodel crew with occasional fabrication work in the shop. I bought the DWE402 at retail to replace a 12-year-old Bosch grinder whose paddle switch finally stuck open (a safety concern). The DEWALT has been my primary grinder for 18 months. None of the testing was sponsored by DEWALT.
How we tested the DWE402
- Cut 1/2 inch rebar in continuous succession (10 cuts) with a thin Diablo metal cutoff wheel.
- Ground welds on a small steel gate (about 8 linear feet of weld bead) with a 60-grit flap disc.
- Removed paint and rust from a 4 ft by 8 ft sheet of barn-door steel with a wire cup brush.
- Cut Hardiebacker for tile installation with a diamond cutoff wheel.
- Compared cut speed against a Milwaukee 2880-20 cordless on identical 1/2 inch rebar cuts.
- Tested guard rotation 50 times to verify the keyless mechanism does not loosen.
- See our methodology page for the standard procedure.
Who should buy the DEWALT DWE402?
Buy this grinder if you are a fabricator, metalworker, or general contractor doing regular grinding or cutoff work in a shop or location with outlet access. Buy it if you want the safer paddle switch (vs slide or thumb switches). Buy it if your existing grinder has worn out and you want a reliable replacement.
Skip this grinder if you specifically need cordless (the Milwaukee 2880 cordless is the right cordless pick), if your work is occasional weekend DIY (the Hercules at half the price works for occasional use), or if you need maximum power (the DWE4011 5-inch grinder is more capable for big cuts).
Power under load
The 11-amp motor maintains 11000 RPM under most cutting loads. On 1/2 inch rebar cutoff, the wheel slows perceptibly only under aggressive feed, recovering quickly when feed pressure is reduced. On 60-grit flap disc grinding of weld bead, the motor stays at near-no-load speed. For practical purposes, the DWE402 has enough power for any task in the 4-1/2 inch wheel class.
Paddle switch with lock-off
The paddle switch is the safety upgrade modern grinders should have. Engagement requires intentional pressure, and the lock-off button must be pushed in to start the grinder. If the user lets go of the grinder under load, the wheel stops. After 18 months, my paddle switch still works smoothly without sticking, which is the failure mode that took out my old Bosch grinder.
Wheel guard
The keyless tool-free guard rotates to 270 degrees and locks at any position. Adjustment takes less than 5 seconds. The guard has not loosened or rotated under cutting load in 18 months. Compared to wrench-required guards, the keyless system saves real time across many wheel changes.
Build quality
After 18 months of regular use, the grinder shows no functional issues. The aluminum gear case has held up to drops onto concrete. The brushes are user-replaceable; I have not yet had to replace them. The 3-year warranty covers most of what could fail.
Vibration
Vibration is moderate, typical for the corded 4-1/2 inch grinder class. After 30 minutes of continuous grinding, my hand shows the vibration. For all-day grinding I use vibration-damping gloves. The grinder is not in the same class as expensive low-vibration models from Metabo or Hilti, but for the price the comfort is acceptable.
Verdict context
Against the Milwaukee 2880-20 M18 FUEL cordless and budget alternatives, the DWE402 is the corded standard at the value price point. It does the job, it is safe, it lasts. Recommended.
DEWALT DWE402 4-1/2 Inch 11-Amp Paddle Switch Angle Grinder vs. the competition
| Product | Our rating | Power | Switch | Guard | Price | Verdict |
|---|---|---|---|---|---|---|
| DEWALT DWE402 | ★★★★★ 4.5 | 11 amp | Paddle | Tool-free | $89 | Top Pick Corded |
| Milwaukee 2880-20 M18 FUEL | ★★★★★ 4.6 | Brushless M18 | Paddle | Tool-free | $219 | Top Pick Cordless |
| Makita 9557PBX1 | ★★★★★ 4.5 | 7.5 amp | Paddle | Tool-free | $99 | Recommended |
| Hercules 4-1/2 Inch Grinder | ★★★★☆ 3.7 | 8.5 amp | Slider | Wrench | $49 | Skip for Pro Use |
Full specifications
| Power | 11 amp / 120V AC |
| No-load RPM | 11000 RPM |
| Wheel size | 4-1/2 inch |
| Spindle | 5/8 inch by 11 |
| Switch | Paddle with lock-off |
| Guard | Keyless tool-free |
| Length | 10.6 inches |
| Weight | 5.7 lb |
| Cord length | 8 ft |
| Warranty | 3 year limited |
Should you buy the DEWALT DWE402 4-1/2 Inch 11-Amp Paddle Switch Angle Grinder?
The DWE402 is the corded angle grinder most metalworkers, fabricators, and remodelers should buy. The 11-amp motor delivers 11000 RPM with consistent power under load, the paddle switch with lock-off is the safer modern grip pattern, and the keyless wheel guard adjusts in seconds. Build quality is rugged enough to survive long-term abuse.
Frequently asked questions
Is the DEWALT DWE402 worth $89 in 2026?+
Yes for shop use, jobsite metal fabrication, and DIY projects. The DWE402 is one of the most reliable corded grinders in the 4-1/2 inch class. After 18 months of regular use mine has not had any failures. For occasional weekend use, the Hercules at $49 is a viable budget pick.
DWE402 vs Milwaukee 2880-20 cordless: which grinder should I buy?+
If you have outlets where you grind, choose the corded DWE402 (cheaper, never runs out of battery, no thermal cutoff under sustained use). If you need to grind on a jobsite without convenient power, choose the Milwaukee cordless. Many fabricators own both.
How loud is the DWE402?+
Loud, like all angle grinders. Approximately 96-98 dB under load on metal cutoff work. Hearing protection is required for sustained use. The motor noise is the same as the wheel-on-metal noise; both contribute.
Should I worry about the side handle threads?+
Slightly. The aluminum threads in the body strip if you over-torque the side handle. Hand-tight is enough; do not use a wrench. If you strip the threads, the grinder still works without the side handle, but two-handed operation is recommended for safety.
📅 Update log
- May 9, 2026Refreshed May pricing.
- Oct 30, 2024Initial review published after 18 months of fabrication use.
