Stone Grinding Abrasive Disc – 6.4mm Thick Depressed

The 6.4mm depressed stone grinding disc is a straightforward workhorse for anyone cutting and grinding masonry on site. Whether you’re dressing back a concrete pour, cleaning up a block course, or grinding down stone before pointing, these discs handle general masonry work without complaint. The depressed centre profile keeps the disc seated securely on a standard angle grinder and gives you a better contact angle on flat surfaces.

Each disc is manufactured to EN12413, which is the European safety standard for bonded abrasives. Three fibreglass reinforcement layers sit within the disc body, which matters more than it sounds — that internal structure is what keeps a grinding disc from breaking apart under load. It’s not something you want to test empirically. The abrasive itself is high-grade silicon carbide, a grit that cuts cleanly through masonry and handles non-ferrous metals without loading up or glazing over.

Where Stone Grinding Discs Like These Get Used

The bonding agent is a bakelite resin, which has been the standard for quality abrasive discs for decades. It holds the silicon carbide grit consistently across the disc face, giving you predictable performance throughout the disc’s life rather than a burst of aggression early on and a dead disc shortly after.

Available in 100mm and 115mm and 125mm diameters, these discs cover the most common angle grinder sizes used in UK construction. The 22.2mm bore fits the standard M14 thread found on the vast majority of angle grinders, and the 16mm bore on the 100mm size suits the smaller 4-inch machines.

Non-ferrous metal work is worth mentioning specifically. Silicon carbide is genuinely well suited to aluminium, copper and brass — materials that would load up a standard flap disc or ferrous grinding wheel quickly. So if you’re on a job that involves both masonry and non-ferrous metalwork, one disc type handles both. That’s a practical convenience rather than a selling point.

At £1.19 per disc and available in bulk quantities of 15 or 25, these make sense to keep a stock of. Grinding discs have a habit of disappearing from site at exactly the wrong moment.