If you spend your days busting up slabs and breaking out concrete edges, the DeWalt DT6823 SDS Max 25x400mm Flat Chisel is a tool you’ll reach for again and again on the job site — and that matters a lot when you’re under the clock. It’s built to slide into SDS-Max breakers and handle heavy chiselling without folding on you.

Out of the box you’ve got a straight-edged, 400 mm long blade that gives you long reach and leverage when you’re working deep into concrete, brick or block, and the heat-treated steel shank isn’t one of those flimsy bits that chews up and fails five minutes into a morning shift.

Key Features:

• 25 mm Cutting Edge - Good width for breaking and chipping, so you push more material per blow.
• SDS-Max Shank - Fits heavy demolition hammers, giving strong strikes without slippage.
• 400 mm Length - Lets you get down into hard-to-reach spots without awkward wrist angles.
• Heat-Treated Steel - Metal that’s taken hard knocks without bending or mushrooming.
• Single Piece Design - No welds or joins where breakage can start — this thing’s solid.

Applications

In practice, this flat chisel is your go-to for concrete and masonry demolition — it’s ideal when you’re channelling out old joints, removing tiles or knocking back mortar on a rebuild. You’ll find it equally at home on block walls, paving or stonework where a clean, flat finish is needed before the next stage.

Why Choose This Model

Here’s the thing — there are cheaper chisels out there, but the DT6823 doesn’t feel cheap at all. The geometry and steel quality give you confidence on every hit, and you’re not replacing it after half a job. If you value a bit that takes proper punishment without flexing or dulling fast, this SDS Max flat chisel is worth the investment.

Technical Specifications Explained

• Shank Type: SDS-Max - Works with larger demolition hammers for serious hitting power.
• Length: 400 mm - Gives reach and keeps your hands away from spray and debris.
• Cutting Edge Width: 25 mm - Good balance of material removal and control.
• Steel Alloy Construction - Keeps edge life up and reduces mushrooming.
• Single Piece Build - Means fewer weak points and long service life.

Who Should Buy This

If you’re a builder, concrete finisher, demolition crew member or restoration specialist who uses SDS-Max breakers daily, the DeWalt DT6823 SDS Max flat chisel should be on your belt. It’s a solid choice when you need dependable performance during heavy chiselling, breakout or surface prep.

And if longevity matters on labour-intensive jobs — where every chisel that bites and doesn’t fail saves you time and frustration — this is one of those bits you’ll be glad you picked up at the start of the day.