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Deal.ai › Flex › Impact Wrenches
Flex
Flex 24-volt Variable Speed Brushless 1/2-in Drive Cordless Impact Wrench FX1431-Z

Flex 24-volt Variable Speed Brushless 1/2-in Drive Cordless Impact Wrench FX1431-Z

4.9(229 ratings)

Best price now

$173.00at Lowe'sChecked 15 h ago

Compared across 4 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission. Price via Klarna.

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Price facts

  • Lowest price today: $173.00 at Lowe's (checked Nov 10, 2026).
  • Checked at 4 stores.

Our take on the Flex 24-volt Variable Speed Brushless 1/2-in Drive Cordless Impact Wrench FX1431-Z

The Flex FX1431-Z is a compact 24V brushless 1/2-inch impact wrench with a friction-ring square drive. It delivers 450 ft-lbs of nut-busting torque and 300 ft-lbs of fastening torque from a body that weighs about 2.6 lb, roughly 38 percent lighter than Flex's larger FX1451. Three speed settings, Bolt Auto Stop, Bolt Removal Mode and a five-level 360-degree LED set it apart from simpler one-speed compact wrenches. It suits auto mechanics and framers who want a light tool for lug nuts, suspension bolts and structural screws, but it ships as a bare tool, so you need Flex 24V batteries and a charger.

Best forAuto repair and tire workFraming and structural screwsOverhead and tight-space jobsOwners already on the Flex 24V battery platform
Pros
  • 450 ft-lbs nut-busting torque in a 2.6 lb body
  • Three speed settings plus variable-speed trigger
  • Bolt Auto Stop and Bolt Removal Mode protect threads
  • 360-degree LED with five brightness levels
  • Brushless motor with THERMA-TECH heat management
Cons
  • Bare tool: no battery or charger included
  • Compact body limits sustained heavy-duty use
  • Flex 24V batteries cost more than some rival platforms

Flex 24-volt Variable Speed Brushless 1/2-in Drive Cordless Impact Wrench FX1431-Z prices at every store

  • MercariPre-owned

    In stock

    $79.99Free shippingChecked 15 h ago
    Visit Mercari
  • Lowe'sNew

    In stock

    $173.00Free shippingChecked 15 h ago
    Visit Lowe's
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $173.62Free shippingChecked 15 h ago
    Visit Amazon
  • WalmartNew

    Out of stockSold by Wooferzone llcReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $109.88Free shippingChecked 15 h ago
    Visit Walmart

Store links may earn us a commission. Some prices via Klarna.

Flex 24-volt Variable Speed Brushless 1/2-in Drive Cordless Impact Wrench FX1431-Z price history

Lowest price we've seen: $173.00 on Nov 10 at Lowe's. Tracked across 2 stores since Nov 10.

What reviewers say

  • 4.9 / 5229 ratings

Owners rate it very highly, praising the power-to-weight ratio, the smooth trigger and the bolt modes. Most complaints center on it being a bare tool and on the cost of entering the Flex battery platform.

What people mention
  • PowerPraisedOwners say it breaks loose lug nuts and stubborn bolts that compact wrenches usually cannot.
  • WeightPraisedReviewers like the light body for overhead and tight-space work.
  • Bolt modesPraisedAuto Stop and Removal Mode are called useful for protecting threads.
  • Battery platformCriticisedBuyers complain that Flex batteries and chargers add significant cost.
  • Bare toolMixedSome are glad to buy tool-only; others find the missing battery and charger a drawback.

About the Flex 24-volt Variable Speed Brushless 1/2-in Drive Cordless Impact Wrench FX1431-Z

The FLEX 24V 1/2” Compact Impact Wrench packs big power into a compact size so you can power through the day with a lightweight, durable tool built to conquer hard-to-reach spaces. This compact cordless impact wrench is 38 percent lighter than its larger counterpart, FX1451, and an ideal tool for automotive and framing applications. This powerful 1/2-inch impact wrench delivers 300 foot-pounds of fastening torque and 450 foot-pounds of nut-busting torque for demanding jobs. When tightening or loosening bolts and lug nuts, Bolt Auto Stop Mode prevents over-tightening, breaking, or stripping the bolt while Bolt Removal Mode stops the tool when it senses the bolt is loosened. Screw Mode delivers faster speed for wood-driving applications like driving SDS screws into pine or LVL. Its 360-degree LED lights up dark areas with five adjustable brightness settings. The ergonomic design and soft-grip handle paired with a variable speed trigger deliver ideal balance, comfort, and total control. This compact impact wrench delivers the FLEX Advantage of unmatched battery power, runtime, and fast charging (battery and charger sold separately)

Specifications

Impact Function
YesSource
Multiple Gears
YesSource
Power Source
BatterySource
Brushless
YesSource

Questions and answers

Does the Flex FX1431-Z come with a battery?
No. It is a bare tool, so you need a Flex 24V battery and charger separately.
How does it compare with the Flex FX1451?
The FX1431-Z is about 38 percent lighter and more compact, with less torque. The FX1451 is the choice for the heaviest fastening.
What is the difference between fastening and nut-busting torque?
Fastening torque is 300 ft-lbs for tightening; nut-busting torque is 450 ft-lbs for breaking loose stuck bolts.
What drive size does it use?
It has a 1/2-inch square drive with a friction ring, so standard 1/2-inch impact sockets fit.
Can it drive structural screws?
Yes. Screw Mode raises speed for wood-driving tasks such as SDS screws into pine or LVL.
How long does a charge take?
Flex states about 35 minutes with its fast charger, and THERMA-TECH heat management extends runtime.
Where is the Flex 24-volt Variable Speed Brushless 1/2-in Drive Cordless Impact Wrench FX1431-Z cheapest?
At Lowe's, for $173.00, as of our latest check.
What do buyers say about the Flex 24-volt Variable Speed Brushless 1/2-in Drive Cordless Impact Wrench FX1431-Z?
Rated 4.9 out of 5 from 229 ratings.
Where can I buy the Flex 24-volt Variable Speed Brushless 1/2-in Drive Cordless Impact Wrench FX1431-Z?
4 stores we checked sell it, including Mercari, Amazon, Walmart, Lowe's.

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Torque Range
450 ft lbs (610 Nm) (Nut-Busting Torque)
Impacts Per Minute
3750
Speed Range
0-1,000/1,800/2,700 rpm
Driving Power
200% more power
Fastening Capacity
300 ft-lbs
Speed Control
Variable Speed, Yes (variable speed trigger)
Number Of Speed Settings
3
Motor Torque
450 ft-lbs
Motor Type
Brushless
Motor Speed Settings
3
Battery Voltage
24V
Battery Type
Stacked Lithium
Battery Capacity
3.5 Ah
Number Of Batteries Included
0
Battery Charge Time
35 minutes
Battery Run Time
25% longer runtime (with THERMA-TECH heat management)
Chuck / Drive Size
1/2 inch
Chuck / Drive Type
Square drive
Chuck / Drive Subtype
Friction Ring
Power Voltage
24V