FLEX

FLEX FX3171A-Z Grinder

Grinder
Battery
5.8 pounds
24 volts

4.7/ 5 on Amazon124Amazon ratings3.7ProductDome score

Better rated than 66%

Medium confidenceLast refreshed Aug 4, 2026Amazon data + ProductDome analysis · methodology

Best forYou want a cordless 24V grinder and do not need to stay near an outlet

Worth considering if cordless freedom at 24 volts and 10,000 RPM fits your grinding needs, though 5.8 pounds is on the heavier side for extended handheld use.

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ProductDome scorecard

How it ranks among the 150 grinders we track

3.7/ 5ProductDome scoreMedium confidence

Owner satisfaction · 56% of scorecategory median 4.6★4.7

4.7★ across 124 Amazon ratings, Bayesian-smoothed toward the category average.

Evidence strength · 17% of scorecategory median 256 ratings2.6

124 Amazon ratings, weighted on a log scale so huge counts don't drown everything.

Buyer demand · 11% of score0.0

Modest tracked demand last month.

Data quality · 11% of score3.8

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: medium - useful but incomplete evidence.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.

Overview

FLEX FX3171A-Z is a battery powered grinder running on 24 volts with a no-load speed of 10,000 RPM and an item weight of 5.8 pounds.

Cordless grinders trade the reach of a cord for battery dependence, and a 24 volt platform at 5.8 pounds sits toward the mid-power, mid-weight end of that category, useful for general fabrication work but not the lightest option available.

FLEX branded grinder
Battery powered, 24 volts
10,000 RPM speed
Item weight 5.8 pounds

Who it's for

Works for users wanting a cordless grinder for metalwork or fabrication away from an outlet. Less ideal for anyone prioritizing the lightest possible handheld weight.

Strengths and trade-offs

Drawn from this product's published specifications.

What stands out

Cordless 24V battery platform
10,000 RPM no-load speed

What to check first

5.8 pound weight adds fatigue over extended use
Battery capacity and runtime not specified

Performance notes

At 10,000 RPM, the disc speed sits in a typical range for angle grinders, and the 24 volt battery platform points to a mid-power cordless system. The 5.8 pound weight means more arm fatigue over long sessions compared to lighter cordless models.

Specifications

Brand	FLEX
Model	FX3171A-Z
Power Source	Battery
Item Weight	5.8 pounds
Voltage	24 volts
Speed	10000 rpm

How it compares

This product against the closest alternatives we track in grinders.

Product	Amazon rating	Ratings	ProductDome score
FLEX FX3171A-Z GrinderThis product	4.7 / 5	124	3.7 / 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

Frequently asked

Questions about the FLEX FX3171A-Z

Common buyer questions answered straight from the product spec data - no fluff, no "it depends".

Is the FLEX FX3171A-Z grinder corded or cordless?

Cordless, running on a 24 volt battery.

What is the no-load speed of the FLEX FX3171A-Z?

10,000 RPM.

How much does the FLEX FX3171A-Z grinder weigh?

5.8 pounds.