The Bosch GDS 18V‑400 Professional Impact Wrench is a go‑anywhere cordless impact that hits the sweet spot between power and practicality — and that matters a lot on a job site where you’re swapping sockets all day and don’t want to lug around something unnecessarily heavy. This is a purpose‑built 18 V tool that pulls up to about 400 Nm of torque — enough grunt to tighten up common M20 bolts and yank stubborn hardware loose without shouting at it.

I’ve used tools that feel like toys beside this one — there’s a tangible difference with the Auto Bolt Release (ABR) feature Bosch tossed in, which actually stops the hammering the second the nut lets go, so you’re not fighting a runaway tool or worn‑out sockets.

Key Features:

• 400 Nm Maximum Torque - Delivers solid fastening strength for medium‑duty bolting jobs without overkill.
• Auto Bolt Release (ABR) - Stops automatically when nuts loosen, saving sockets and your nerves.
• 18 V Cordless Design - Lets you take the power anywhere without tripping over cords.
• 1/2″ Square Drive - Works with the sockets you already have on your belt.
• Compact and Light - Around 1.25 kg without the battery makes it easy to handle all day.

Applications

In practice, the Bosch GDS 18V‑400 shines on automotive tasks, industrial assembly, farm gear maintenance, and anywhere you’re dealing with M10 to M20 bolts — it’s not chasing extreme torque, it’s chasing reliability and repeatability. It’s the sort of impact you grab when you’ve got a stack of wheel hubs to spin, a flitch of chassis bolting to do, or you’re servicing heavy equipment in tight spots.

Why Choose This Model

Here’s the thing — you don’t pick this if you want the biggest hammer in the shed, but you do pick it when you want a dependable mid‑torque performer that doesn’t drain batteries or beat your arms to death. The GDS 18V‑400 Professional strikes a hard balance between weight, control, and power, and the ABR feature isn’t just fluff — it keeps you from wrestling with a tool when a fastener finally spits loose.

Technical Specifications Explained

• Battery Voltage – 18 V - Standard professional battery platform for decent runtime and compatibility across Bosch 18 V tools.
• Max Torque – 400 Nm - Gives you enough bite for common bolting tasks without being a brute.
• No‑Load Speed - Up to around 2,500 rpm for fast spin without load.
• Impact Rate – 3,700 bpm - Rapid blow rate for speedy fastening and loosening.
• Tool Holder – 1/2″ Square - Standard size so you’re not chasing odd adapters.

Who Should Buy This

If you’re a mechanic, fabricator, or field tech who deals with a mix of fasteners and likes gear that won’t wear you down, the Bosch GDS 18V‑400 Professional is built for you — it’s the right tool when you need dependable mid‑range torque without lugging something bigger.

But if your day is all about heavy machinery with massive bolts, or you’re chasing maximum torque figures, you’re probably looking at a different class of impact wrench — something heftier. For everything else where balance matters, this one punches well above its weight.