Flex FX1472-Z Review

Some fasteners seem to have been installed by someone who believed they would never need to be removed again. The crank pulley bolt on a diesel engine, the rust-fused lug nuts on a commercial truck, the seized suspension pin on a tractor, the corroded flange bolts on industrial machinery — these are not jobs for a standard impact wrench. They demand extreme breakaway torque, the kind measured in thousands of Newton-metres rather than hundreds. A high-torque impact wrench in the 1500 foot-pound class is a different breed of tool entirely. It uses a heavy-duty hammer-and-anvil mechanism driven by a high-output brushless motor and fed by stacked lithium cells that can deliver the instantaneous current needed to generate massive rotational impact force. These tools live in truck tyre shops, heavy equipment bays, agricultural workshops, and industrial maintenance facilities — anywhere that large-diameter, high-torque fasteners are the daily norm. They turn a job that might require a metre-long breaker bar, a cheater pipe, and two people into a single-handed operation that takes seconds.

Flex is a professional power tool brand that has positioned itself aggressively in the high-performance cordless segment, competing directly with Milwaukee's FUEL line and DeWalt's XR FlexVolt range. The FX1472-Z is Flex's flagship high-torque impact wrench: a 24-volt brushless tool rated at 1500 foot-pounds (approximately 2033 Nm) of maximum breakaway torque when paired with the recommended 6.0 Ah stacked lithium battery. Stacked lithium cells — a newer battery technology that packs more power density and delivers higher current than traditional cylindrical 18650 or 21700 cells — are central to achieving this torque figure from a cordless platform. The tool features two automatic control modes: Bolt Auto-Stop, which prevents overtightening and fastener damage during assembly, and Bolt Removal mode, which stops the impact mechanism once the fastener is loose, preventing the bolt from being flung off. A vibration-dampening system isolates the user from the impact shocks, reducing fatigue during prolonged use.

This review examines the Flex FX1472-Z across the criteria that define a professional high-torque impact wrench: actual breakaway performance on heavily torqued and corroded fasteners, the effectiveness of the automatic control modes, battery runtime with stacked lithium packs, vibration dampening during extended use, and build quality relative to its premium price point. Note that this is a tool-only purchase — battery and charger are sold separately — and the full torque specification is achieved only with Flex's 6.0 Ah or larger stacked lithium batteries. At over €300 for the bare tool, this is an investment-grade purchase for professional users who routinely encounter fasteners that lesser impact wrenches cannot shift.

The Flex FX1472-Z is a cordless 24-volt brushless high-torque impact wrench with a 1/2-inch square drive, rated at a staggering 1500 foot-pounds (approximately 2033 Nm) of maximum breakaway torque when used with Flex's 6.0 Ah or larger stacked lithium battery. This places it in the absolute top tier of cordless impact wrenches — competitive with the most powerful models from Milwaukee and DeWalt and exceeding the capabilities of all but the largest pneumatic impact guns. The brushless motor is electronically controlled to optimise power delivery and efficiency, and the tool is built around a heavy-duty hammer-and-anvil impact mechanism designed to survive repeated peak-force impacts without premature wear. The 1/2-inch anvil uses a friction ring or detent pin (depending on variant) to retain sockets during high-torque operation.

Two intelligent control modes set the FX1472-Z apart from simpler high-torque wrenches. Bolt Auto-Stop mode monitors the impact pattern and automatically ceases when the fastener reaches a pre-determined tightness — preventing the overtightening that can strip threads, shear bolt heads, or warp brake discs when an impact wrench is used carelessly during assembly. Bolt Removal mode works in the opposite direction: once the fastener breaks free and begins to spin, the tool stops impacting and slows the anvil, preventing the loosened nut or bolt from being ejected at high speed — a common nuisance and occasional hazard when removing fasteners with a standard impact wrench. These modes are selected via a button on the tool body, alongside a standard variable-speed trigger for manual control. A multi-LED work light array provides shadow-free illumination of the work area, particularly useful when working under vehicles or inside machinery housings.

The vibration dampening system is a significant ergonomic feature. High-torque impact wrenches transmit substantial impact shock through the handle into the user's hands and arms; over the course of a working day, this cumulative vibration leads to fatigue, reduced control, and long-term risk of hand-arm vibration syndrome (HAVS). Flex has incorporated dampers into the handle assembly that absorb a meaningful portion of the impact energy before it reaches the user. While not eliminating vibration entirely — no impact wrench can — the reduction is noticeable during extended use and contributes to more precise control during both loosening and tightening. At 3.47 kg bare (approximately 4.2 kg with a 6.0 Ah stacked battery), the tool has the substantial heft expected of a heavy-duty impact wrench, and the rubberised grip and balanced weight distribution help keep it manageable.

The FX1472-Z is sold as a tool-only unit: no battery, no charger, no sockets, no case. This is standard for professional-grade cordless tools at this level — the assumption is that the buyer already owns Flex 24V batteries and a charger, or will purchase them separately. The recommended battery for achieving the full 1500 ft-lb rating is the 6.0 Ah stacked lithium pack; using smaller-capacity batteries reduces the maximum torque output. Flex tools are compatible across the brand's 24V platform, so batteries purchased for this wrench also power Flex circular saws, grinders, drills, and other tools. The tool is backed by Flex's limited lifetime warranty when registered within 30 days of purchase — a strong statement of confidence in the product's durability and a significant differentiator in the professional tool market.

The wrench weighs 3.47 kg bare and carries a 5.0 out of 5 stars rating from 4 customer reviews on Amazon.fr. The extremely small review count reflects both the premium price point and the tool's positioning as a professional specialist item rather than a consumer product. For heavy equipment mechanics, truck and bus technicians, agricultural machinery fitters, and industrial maintenance crews who routinely encounter fasteners in the 1000-2000 Nm range — and who need cordless freedom without the air compressor infrastructure required by equivalent pneumatic tools — the Flex FX1472-Z represents the cutting edge of what a battery-powered impact wrench can achieve.

The Flex FX1472-Z is designed for professional heavy equipment mechanics, truck and bus technicians, agricultural machinery fitters, and industrial maintenance crews who need extreme breakaway torque from a cordless platform and are already invested in — or willing to invest in — Flex's 24V stacked lithium battery system.