CRAFTSMAN CMCG400B Grinder
- Grinder
- 20000 watts
- Battery
- 5.71 pounds
- Better rated than 66%
- More reviewed than 93%
A cordless 20V angle grinder with a 4.7 rating and solid monthly demand, a reasonable pick for a Craftsman battery owner tackling grinding or cutting tasks around the shop.
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How it ranks among the 150 grinders we track
4.7★ across 2,900 Amazon ratings, Bayesian-smoothed toward the category average.
2,900 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
600+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 150 grinders we track - how the scorecard works · full grinders data report. Confidence: high - strong rating volume and complete data.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
The Craftsman CMCG400B is a cordless angle grinder on Craftsman's 20V battery platform, rated at 9000 RPM with a listed item weight of 2.59 kilograms, about 5.7 pounds. It holds a 4.7 rating across roughly 2,900 reviews.
Nine thousand RPM sits in the typical range for a compact angle grinder used on metal grinding, cutting and deburring. The RPM figure and 20 volt battery spec line up cleanly with a standard cordless angle grinder, even though the category label reads as a general Specialties adjacent listing.
- 20V battery powered
- 9000 RPM rated speed
- 2.59 kilogram item weight
- 4.7 rating, about 600 bought last month
Who it's for
Suits someone already on Craftsman's 20V battery system who wants a cordless grinder for metalwork, deburring or light fabrication. Less suited to heavy continuous grinding where a corded, higher wattage grinder would hold up better over long sessions.
Strengths and trade-offs
Drawn from this product's published specifications.
- Cordless on Craftsman's 20V battery platform
- 9000 RPM rated speed for grinding and cutting
- 4.7 rating across roughly 2,900 reviews
- About 600 bought in the past month
- No disc size or accessory compatibility listed
- Battery and charger inclusion not confirmed in this listing
- At 2.59 kilograms, heavier than some corded compacts
Performance notes
At 9000 RPM on a 20 volt battery, the CMCG400B is built for short bursts of grinding, cutting or deburring rather than continuous industrial use, the usual tradeoff of cordless grinders against corded models. The listed 2.59 kilogram weight is worth checking against your own grinder if hand fatigue over longer sessions matters to you.
Specifications
| Brand | Craftsman |
|---|---|
| Model | CMCG400B |
| Motor Power | 20000 watts |
| Power Source | Battery |
| Item Weight | 5.71 pounds |
| Voltage | 20 volts |
| Speed | 9000 rpm |
Other Craftsman grinders
How it compares
This product against the closest alternatives we track in grinders.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| CRAFTSMAN CMCG400B GrinderThis product | 4.7 / 5 | 2,900 | 4.4 / 5 |
| DEWALT DCG413B GrinderDeWalt | 4.8 / 5 | 9,600 | 4.6 / 5 |
| Milwaukee 2880-20 GrinderMILWAUKEE | 4.8 / 5 | 2,400 | 4.5 / 5 |
| AVID MW590 GrinderAVID | 4.5 / 5 | 6,100 | 4.4 / 5 |
| Makita 9557PBX1 GrinderMAKITA | 4.8 / 5 | 3,960 | 4.4 / 5 |
Similar grinders from other brands
Questions about the Craftsman CMCG400B
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What battery does the Craftsman CMCG400B use?
It runs on Craftsman's 20 volt cordless battery platform.
How fast does it spin?
It is rated at 9000 RPM.
How much does it weigh?
The listed item weight is 2.59 kilograms, about 5.7 pounds.