DEWALT DCG405B 20V MAX XR Slide Switch Angle Grinder
- Wattage: 850 watts
- Maximum Rotational Speed: 9000 rps
- Power Source: Battery
- Material Type: Blend
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A light, 20 volt cordless grinder with 850 watts of motor power, worth considering if you already own DeWalt 20V batteries, since the listing does not confirm one is included.
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ASIN: B084643WXSModel: DCG405BCategory: Power Grinders
Overview
The DeWalt DCG405B is a 20 volt battery powered angle grinder rated at 850 watts of motor power and a top speed around 9000 rpm. At 3.8 pounds bare, it is light enough for extended one-handed grinding or cutting work.
DeWalt's 20V MAX cordless platform is the frame this grinder sits in, though the listing does not confirm disc diameter or included accessories, only power figures. Buyers coming from a corded grinder should expect competitive output on paper, with actual runtime depending on the battery pack, which the bare tool style model number DCG405B suggests is not included.
- 20 volt battery powered
- 850 watt motor power
- About 9000 rpm top speed
- 3.8 pound tool weight
Who it's for
Tradespeople already on DeWalt's 20V battery system, who want a light cordless grinder for cutting and light grinding tasks on site, are the target buyer. Anyone needing sustained heavy grinding all day may prefer a corded tool with no runtime limit.
Pros and cons
- Light at 3.8 pounds
- Cordless convenience on the 20V platform
- 850 watt motor output
- Battery and charger not confirmed included
- Disc size not specified in listing
- Cordless runtime limited versus corded tools
Performance notes
850 watts of motor power paired with a roughly 9000 rpm top speed is enough for cutting wheels and light grinding discs. Cordless torque under sustained load will still trail a corded grinder of similar wattage, and runtime depends entirely on the battery pack used.
Specifications
| Brand | DeWalt |
|---|---|
| Model | DCG405B |
| Dimensions & fit | |
| Item Weight | 3.8 poundshigher than 52% of 107 power grinders |
| Item Dimensions L X W X H | 12.9 × 6.3 × 4.9 inches |
| Capacity & performance | |
| Maximum Rotational Speed | 9000 rps |
| Power & efficiency | |
| Wattage | 850 wattshigher than 59% of 55 power grinders |
| Power Source | Battery |
| Voltage | 20 voltslower than 65% of 103 power grinders |
| Construction & materials | |
| Material Type | Blend |
| Color | Multi |
| Included components | |
| Unit Count | 1 |
| Included Components | (1) DCG405 20V MAX* Grinder; (1) Side Handle; Hex Key; (1) Inner And Outer Flange; (1) 4.5 In. Type 27 Guard |
| Other details | |
| Style Name | Classic |
| Item Type Name | Grinder |
Closest rivals on specs
RYOBI PCL445B 18V Cordless Angle Grinder 4-1/2 Inch- Voltage 20 vs 18 volts (+11%)
Makita XDG01Z 18V LXT Cordless Die Grinder 1/4 Inch- Voltage 20 vs 18 volts (+11%)
Cordless Angle Grinder for Milwaukee M18 Battery 4-1/2 Inch- Voltage 20 vs 18 volts (+11%)
Frequently asked questions
Does the DeWalt DCG405B include a battery?
The listing does not confirm this. The B suffix on DeWalt bare tool model numbers typically means battery and charger are sold separately.
What is the top speed of the DCG405B grinder?
It is rated at roughly 9000 rpm.
How much does the DCG405B weigh?
3.8 pounds for the bare tool.