SDS Max Flat Chisel – 25mm x 400mm

The 25mm SDS Max flat chisel is the go-to bit when you need to break out masonry, cut joints, lift tiles or trim concrete edges on a proper rotary hammer. At 400mm in length, it gives you reach into tighter spots without losing the leverage you need to move material quickly. Fits any SDS Max compatible machine, so if you’re already running a heavy-duty breaker on site, this drops straight in and gets to work.

SDS Max is the bigger sibling of SDS Plus — it locks in with a more substantial shank that handles the higher impact energy of larger rotary hammers. That’s the difference between chipping at a problem and actually solving it. For anything beyond light patching or cosmetic work, SDS Max is the right system. The flat chisel profile spreads force across the cutting edge, making it well suited to breaking out tiles, cutting horizontal lines in brick joints, and general demolition work where you want to remove material rather than just crack it.

Where the 25mm SDS Max Flat Chisel Does Its Work

On a construction or refurb site, this chisel earns its keep in a handful of recurring situations. Removing old floor and wall tiles is probably the most common, and the flat profile slides under adhesive beds without gouging the substrate too badly if you keep the angle low. Breaking out sections of brickwork, clearing mortar from joints before repointing, and trimming concrete blockwork to fit are all jobs this chisel handles without fuss.

It’s also useful for opening up chases for pipework or cable routes, though for finer channel work you’d typically bring in a pointed or narrow flat chisel. At 25mm, this one sits in a practical middle ground — wide enough to shift material at pace, narrow enough to work in tight areas without collateral damage.

At this price it makes sense to keep a spare on the van. Chisels do blunt over time, and swapping to a fresh edge mid-job rather than grinding on with a worn one actually saves time.