Flex Vs Makita Impact Driver Head-to-Head Review

Flex Vs Makita Impact Driver Head to Head Review

Today, we’re taking a closer look at the Flex FX1371 vs the Makita GDT01 impact driver in a head-to-head review. For Flex, it’s the first-generation 24V brushless model that turned heads with its performance claims and features a push-button quick release for the collet. For Makita, it’s the first offering on the high-performance 40V max XGT line.

Neither is the only impact driver for their respective lines. However, they’re both still the performance leaders for them, despite being the first models available.

We’re sharing what we know from testing and research, but the ultimate question is… which one is right for you? Are you going for the highest performance, lowest price, most compact, or something else? Whichever one is the winner in your book, let us know in the comments below!

Check out our best impact driver recommendations for the year!

Flex Vs Makita Impact Driver Specifications

Let’s start with what we can learn from the specifications. Note that because Flex uses a 24V system and Makita is at 40V, there’s not a perfect battery matchup. For Flex, we’re using the weight with a 5.0Ah battery (108Wh). For Makita, it’s the 2.5Ah pack (90Wh).

Flex FX1371Makita GDT01
Top Speeds1900/2700/4000 RPM1100/2100/3200/3700 RPM
Max Impact Rate4450 IPM4400 IPM
Max Torque2500 in-lbs1950 in-lbs
Head Length4.8 in4.8 in
Bare Weight2.8 lbs2.2 lbs
Weight w/Battery4.9 lbs3.7 lbs

Flex Vs Makita Impact Driver Feature Highlights

Flex FX1371

Flex Vs Makita Impact Driver
  • Brushless motor
  • 3 standard peeds
  • Self-tapping screw mode
  • Quick Eject collet

Makita GDT01

Flex Vs Makita Impact Driver
  • Brushless motor
  • 4 standard speeds
  • 2 tightening modes, 1 assist mode, 3 forward/reverse auto-stop modes
  • Dual head-mounted LEDs

Flex Vs Makita Impact Driver Test Results

There are three tests we put both impact drivers through to determine their comparative performance. The first is a medium-load test driving a 6-inch x 1/4-inch GRK Fasteners RSS screw into stacked OSB subfloor. The result is the average of three tests.

The second test is timed to see how far each model can drive a 10-inch x 1/2-inch lag screw into the same material in 30 seconds. The result is the average of how much of the screw remained proud in three tests—less is better.

The third test is to see how long it takes to break loose a nut that is set to 150 ft-lbs (1800 in-lbs). The result is the total time added together for 5 bolts.

Flex FX1371Makita GDT01
RSS Screw Average8.7 seconds12.8 seconds
Lag Screw Average3.1 inches3.5 inches
Nut-Busting Total3.2 seconds6.0 seconds

What if you have access to advanced batteries? We tested those, too! Flex has a Stacked Lithium pouch cell battery available. However, Makita does not currently have an upgrade (though its standard batteries are quite a bit more advanced than some).

Flex FX1371
w/6.0Ah Stacked Lithium
Makita GDT01
RSS Screw Average5.9 seconds12.8 seconds
Lag Screw Average0.7 inches3.5 inches
Nut-Busting Total2.3 seconds6.0 seconds

Flex Vs Makita Impact Driver Price

Flex FX1371Makita GDT01
Bare Tool$159.00$217.00
Standard Battery Kit$249.00 (2.5Ah and 5.0Ah)$429.00 (2 x 2.5Ah)
Advanced Battery Kit$279.00 (6.0Ah Stacked Lithium)Not Available
Warranty5 years (lifetime with registration)3 years
*Prices at the time of writing from Acme Tools

So who’s your winner? Let us know in the comments below—bonus points for telling us why!

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The issue I see with these overpowered Flex and Mil impact drivers is how many bits they break. The Makitas do to but no where near to the same extent. Until someone invents a stronger bit almost all of these have maxed out useful power.
Nut busting for example should be left to an impact wrench.


Why not use same size batteries? Or close to same size? Thank you


What about noise levels? I still use my battery drill to drive fasteners because I can not find out if any manufacturer has done anything to muffle the racket of “the infernal hand jackhammer.” Nothing is worse than working near someone using an impact driver.


I own some FLEX cordless tools and man they are really good! I have no doubt their impact driver is fantastic as well!

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