Greenworks GD24IW400 Cordless Impact Wrench (Brushless) – 400Nm, 1/2" coupler (tool only)

What it is and why you’d want it

The Greenworks GD24IW400 is a cordless impact wrench built around a brushless motor, aimed at quick, repeatable jobs where you need rotational force plus an impact action. On paper it’s the kind of tool that makes driveway and garage maintenance less of a chore: loosening tight wheel nuts, swapping mower blades, or tackling common seasonal tasks that tend to seize up.

It’s also worth noting the wording “tool only” in the pack name. This unit is supplied without a 24V battery and charger, so it’s really geared towards people who already own Greenworks 24V kit and can reuse the same battery.

The essentials (performance and control)

Where this model leans in is speed and impact capability. It offers variable speeds up to 0-2800rpm and impacts up to 0-4000ipm, plus 3 speeds with forward and reverse control. In practical terms, that’s a sensible spread: you can start gently to avoid overdoing things, then ramp up when the fastener finally breaks free.

The trigger-based speed control and the forward/reverse switch are the everyday controls you’ll actually use. And for changing bits quickly, it includes a quick-release coupler system described as “easy and fast” for swapping.

What stands out in day-to-day use

A lot of impact drivers and wrenches are fine on the bench, but the real test is how often you need to get stuck-in and move fast. This one is designed to feel “powerful, light and compact”, which is helpful if you’re working in awkward wheel arches or leaning over a mower.

If you do regular blade changes, the combination of impact action and controlled speeds can take the sting out of stubborn blade bolts. Likewise, for seasonal tyres, it’s the sort of tool that can make getting wheel nuts off and back on more manageable than wrestling with a breaker bar.

There’s a slight trade-off, though: without the battery/charger included, you’ll need to plan around your existing 24V setup. If you don’t already have Greenworks 24V batteries, the total cost of entry can rise quickly.

Tech summary (the numbers you actually care about)

• Name: Greenworks GD24IW400
• Type: Cordless impact wrench (brushless motor)
• Size: 1/2" (1.27cm) coupler
• Torque: 400Nm
• Speed range: 0-2800rpm
• Impact rate: 0-4000ipm
• Motor: Brushless
• Control: Variable speed trigger, forward and reverse

Pros and cons before you buy

Strengths (where it makes sense): - Brushless motor approach is designed for more efficient use and longevity (as described), which matters if you’ll use it more than once in a while. - Strong headline figures for torque (400Nm) plus up to 0-2800rpm and 0-4000ipm for seized fasteners. - Three-speed control with forward/reverse should help with both loosening and tightening tasks. - Quick-release bit/coupler concept supports faster changes. - Includes a 3-year guarantee from Greenworks.

Limitations (things to double-check): - This is a “without 24V battery & charger” bundle. If you’re starting from zero, you may need to factor in an additional purchase. - The listed coupler size is 1/2", so it only really suits setups that match that standard. - While the description mentions mower blade and seasonal tyres, it doesn’t spell out specific compatibility for every vehicle or fastener type—so if you’re dealing with unusual wheel hardware, it’s worth checking your requirements.

Should you buy it?

Is it worth it?

Buy the Greenworks GD24IW400 if you already have Greenworks 24V batteries and you want a cordless impact wrench that’s built around everyday speed and impact performance: changing mower blades, handling seasonal tyres, and loosening/tightening stubborn nuts without going manual.

It’s not the best choice if you don’t own any Greenworks 24V battery system, because the pack is tool-only and you’ll still need a compatible 24V battery and charger to get going. Also, if your tools and sockets require a coupler size other than 1/2", you may need a different approach.

Quick example of real use

Imagine you’re switching from summer to winter tyres: you set the wrench to a lower speed for the first “break”, move up when the nut loosens, then use reverse/forward as needed for removal and tightening. Or, for mower blades, you can use the speed control to avoid sudden aggressive tightening while you seat everything properly before you finish off.

Mini FAQ

What does “tool only” mean here?

It means the Greenworks GD24IW400 pack is supplied without a 24V battery and charger, so you’ll need a Greenworks 24V battery to use it.

What’s the coupler size?

The wrench is listed with a 1/2" (1.27cm) coupler.

How fast does it run and how often does it impact?

It’s listed at 0-2800rpm and up to 0-4000ipm.

Is there a guarantee?

Yes, it includes a 3-year guarantee from Greenworks as stated in the product info.

Does it have forward and reverse?

Yes. The description notes a single switch for advance and reverse, plus trigger control for speed.