A 115mm diamond blade built specifically for cordless angle grinders. Cuts concrete, stone, steel, cast iron, copper, wood with nails, plastics and more. Ultra-thin kerf for fast, clean cuts. Fits 4.5 inch grinders with 22.2mm bore.
The Marcrist MC850 multi material diamond blade is one of those tools that genuinely earns its place on the van. Designed from the ground up for cordless angle grinders, it cuts through an extraordinary range of materials without swapping blades mid-job: concrete, natural stone, iron and steel, cast iron, copper, wood with embedded nails, plastics, PVC, rubber and profiles. One blade, whatever the site throws at you.
Most multi-material blades are a compromise. They are designed for mains-powered machines and tolerate cordless use at best. Marcrist took a different approach with the MC850 Akkumax PRO. The blade geometry and diamond segment specification are tuned specifically to the lower, less consistent power output of battery grinders. That means you are not fighting the machine to get a clean cut, and you are not draining your battery pack halfway through a run.
Where the Marcrist MC850 Akkumax PRO Earns Its Keep
Rescue work, site strip-out, emergency access, first fix and second fix scenarios where materials overlap without warning. Plumbers cutting through old copper and the surrounding screed. Roofers trimming corrugated sheet or cutting back flashings. Electricians who have hit a joist full of nails. Groundworkers needing to cut a concrete slab and then score a plastic drainage channel in the same pass. The MC850 handles all of it.
The ultra-thin cutting edge is worth mentioning separately. Thinner kerf means less material resistance, which directly translates to faster cuts and longer battery runtime per charge. On a cordless machine that is not a minor detail, it is the difference between finishing the job on one battery and having to stop and wait. Any cordless grinder user will tell you there are few things more annoying on site than a flat pack at the wrong moment.
Fit and Compatibility
The Marcrist MC850 diamond blade is 115mm in diameter with a 22.2mm bore, fitting all standard 4.5 inch angle grinders. The bore size is universal across every major brand of cordless grinder currently on the market, so no adaptor rings, no faff. Marcrist backs this blade with a money-back guarantee if it does not outperform what you are currently using. That is a fairly confident statement for a cutting blade, and based on what the MC850 is specced to do, it is not hard to see why they offer it.
Pro Tip: On a cordless grinder, let the blade do the work: apply steady, light pressure and keep the disc moving rather than forcing it, which protects both the diamond segments and your battery life.
The MC850 Akkumax PRO is built for mixed-material environments where you cannot predict what you are about to cut into. It handles everything from reinforced concrete and natural stone through to copper pipework, cast iron, mild steel, profiles and structural sections. It also cuts wood containing fixings, making it particularly useful during demolition and strip-out where buried nails and screws are an occupational hazard.
Common applications include rescue and emergency access cutting, site strip-out, plumbing and mechanical work, roofing and sheet metal trimming, groundworks, and general trade use across construction and maintenance. The 115mm format and universal bore make it compatible with the cordless grinders already on most vans.
Best For
Cordless angle grinder use
Mixed-material cutting on site
Rescue and emergency access
Site strip-out and demolition
Plumbing and mechanical trade work
Roofing and sheet metal trimming
Compatible Materials
Concrete and natural stone
Iron and mild steel
Cast iron
Copper
Wood with nails
Plastics, PVC and rubber
Profiles and structural sections
Key Specifications
Diameter: 115mm
Bore: 22.2mm
Fits 4.5 inch angle grinders
Ultra-thin kerf diamond segment
Purpose-designed for cordless machines
Money-back performance guarantee
Not suitable for: Not designed for use on large format floor saws or high-speed mains bench cutting equipment. Best results are achieved on handheld cordless or mains angle grinders in the 4.5 inch class.
Fit the MC850 to your 4.5 inch angle grinder using the standard 22.2mm arbour flange. Check the directional arrow on the blade matches your grinder's rotation direction before starting. Mark your cut line clearly if working on stone or concrete, as the thin kerf offers little room for correction mid-cut.
Apply steady, moderate pressure and let the blade feed through the material at its own pace. Forcing it shortens segment life and loads the battery harder than necessary. On harder materials like reinforced concrete or cast iron, short scoring passes followed by a deeper cut will give a cleaner result than trying to achieve full depth in one go.
Ensure the angle grinder is switched off and the battery removed before fitting the blade
Fit the MC850 to the 22.2mm arbour and tighten the flange nut securely using the correct spanner
Check the rotation direction arrow on the blade matches the grinder's spindle direction
Refit the battery and carry out a brief free-spin check before approaching the workpiece
Mark the cut line on the material where accuracy is needed
Begin cutting with light, steady pressure, allowing the diamond segments to do the work
On thick or hard materials, use scoring passes to establish the cut before going to full depth
Allow the blade to cool between extended cutting runs, particularly on dense stone or cast iron
Will the MC850 work on a mains-powered angle grinder as well as a cordless one?
Yes, the 115mm 22.2mm bore format fits both cordless and corded 4.5 inch angle grinders. The blade is optimised for cordless use, but it performs perfectly well on mains machines too. You are simply not restricted to one or the other.
What does the money-back guarantee actually cover?
Marcrist offer a performance guarantee: if the MC850 does not outperform your current multi-material blade, you can claim your money back. It applies to the cutting performance of the blade rather than covering accidental misuse or damage. Worth keeping your receipt.
The MC850 Akkumax PRO uses a diamond-segmented cutting edge with an ultra-thin kerf profile, reducing cutting resistance and heat build-up compared to standard multi-material blades. The segment specification and blade body geometry are matched to the torque and speed characteristics of modern cordless angle grinders, maintaining effective cutting performance across widely varying material densities from soft plastics through to reinforced concrete and ferrous metals.
Diameter
115mm
Bore
22.2mm
Intended Machine
4.5 inch angle grinder (cordless and corded)
Blade Type
Diamond segmented multi-material
Kerf Profile
Ultra-thin
SKU
MC850AKU115
Brand
Marcrist
Guarantee
Money-back performance guarantee
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