DeWalt DWE402: problems, parts and running costs

Checked: 2026-10-17

Summary

The DWE402 is DeWalt’s 4-1/2 in. 11 Amp corded angle grinder with a paddle switch and lock-on button, sold since 2015 as the replacement for the D28402, with 40% more copper in the motor than its predecessor [1][4]. It has no wheel brake, kickback brake or E-clutch, and the retailer reviews behind this page show no widespread failure mode; owners praise its power, durability and dust control [1][7][8]. Store prices at tool retailers in 2026 cluster around $110–120 [10][14].

Common problems and fixes

No brake of any kind — DeWalt lists no wheel brake, no kickback brake and no E-clutch, so a jammed wheel keeps spinning until it is clear; there is no owner fix, only care in use; these are listed as not fitted rather than defects, so warranty does not apply [17].
Listings blur the DWE402 and DWE402N — the two look identical and share one instruction manual, but the N drops the lock-on button; some retailer listings do not distinguish them, so match the model number before buying [1][2][18].
Gear-case separation limit — if the gear case and motor housing separate by more than 1/8 in. (3.17 mm), the manual says stop using the grinder and send it to a DeWalt service center to avoid brush, motor and bearing failure [18].
Voltage event after 4 years — one owner reported a DWE402N dying to “poor factory voltage” after 4 years and replacing it with the DWE402; a single anecdote, not a pattern [7].
Brush wear ends in shut-down — the auto-off brushes shut the tool down when the brushes need replacing rather than letting the motor damage itself; treat brush replacement as the designed wear item [1].

Parts and consumables

Lock-on button (PN290861) — $1.16 on DeWalt’s ServiceNet portal, an example of the individual parts sold there [9].
Guard, wrench and side handle — the 4-1/2 in. One-Touch (T27) guard, a wrench and a 2-position side handle are in the box [1].

Yearly running cost

No source publishes a dollar-per-year figure. The recurring spend is grinding and cut-off wheels plus brush replacements; any 4-1/2 in. wheel with a 5/8"-11 arbor fits, so the wheel budget depends on the work [1][9]. The tool is 120 V corded and no consumption figure is published. Small repairs stay cheap because ServiceNet sells individual parts — the lock-on button is $1.16 — and the 3-year limited warranty, 1-year free service and 90-day satisfaction guarantee cover defects [1][9].

When it is a good buy

Store prices at tool retailers (2026): Dillon Supply $109.95, WebstaurantStore $116.49, Fleet Farm $119.99, Travers Tool $120.50 and Tanner Bolt $120.50; the no-lock DWE402N is $139.95 at Global Industrial and $130.26 at Hane Supply, and Équipement Polar lists the DWE402 at $137 CAD in Canada [5][10][11][12][13][14][15][16]. DeWalt launched the grinder at about $99 in 2015 [4]. A Canadian tool review site calls it “the corded grinder we recommend most often” for regular professional use [5]. Value bands from the research: $110 or less is strong value, $111–130 still good for jobsite use where the lock-on button and dust ejection matter, $131–150 fair, and above $150 weak for a corded 4-1/2 in. grinder. Alternatives the research names:

Milwaukee, Metabo and Bosch corded grinders — the comparison set for the fair zone; the 11 Amp, 11,000 RPM spec is ordinary for this class [1].
DeWalt DWE402N — the same core tool without the lock-on button; at the two stores checked it lists at $139.95 (Global Industrial) and $130.26 (Hane Supply), so check whether skipping the lock-on feature is worth it [2][15][16].
DeWalt DWE402K — the kit adds a depressed-center wheel and a kit box if you want a wheel in the box [3].