Cutting control joints into a slab that was finished a few hours ago is a race, and the blade is what decides whether you win it. The MK Diamond MK-610W is built for exactly that window. It is a supreme grade wet-cutting blade for green concrete, 12 inches in diameter with a .250 inch kerf and a 1 inch arbor, aimed at the flatwork crew, the sawing subcontractor and the site superintendent who has to get joints in before the slab decides where it wants to crack. Green concrete is abrasive in a way that cured concrete is not, and this blade is engineered around that fact rather than pressed into service from a general-purpose line.
Built for
- Control and contraction joints in fresh flatwork. Industry guidance puts joint sawing roughly six to twelve hours after finishing and warns against going past twenty-four, because past that point the slab starts choosing its own crack locations.
- Joints cut wide enough to seal in one pass. At a .250 inch kerf this blade leaves a slot at or above the quarter-inch width that sealant guidance treats as the minimum cleanable joint, so on many jobs a separate reservoir-widening pass is not needed.
- Reservoir widening over an existing narrow cut. Running a wider blade back through an earlier joint removes raveled edges and opens the joint to the dimensions the sealant manufacturer calls for.
- Driveways, sidewalks, slabs on grade and parking decks. Anywhere a crew is pouring and then jointing the same day.
- Walk-behind saws in the 8-20 horsepower range. That is the band MK Diamond rates the MK-610W series for.
The reason green concrete gets its own blade line comes down to what is happening inside the slab. In a green pour the sand has not yet bonded into the mortar, so it moves freely in the cutting slurry and scours everything it touches. That slurry attacks the steel core at the base of the segments as much as it attacks the diamond itself. Blades built for green concrete answer this with a harder bond, so the matrix does not give up its diamonds prematurely, and with undercut protection at the segment joints to shield the core where the abrasion concentrates. Reach for a cured-concrete blade in a green slab and you will typically see the core wear out from underneath long before the diamond is spent.
Specifications
- Manufacturer: MK Diamond Products
- Series: MK-610W, Supreme grade for green concrete
- MK Diamond part number: 139139
- Blade diameter: 12 inches (305mm)
- Blade width (kerf): .250 inches
- Arbor: 1 inch
- Segment height: 12mm
- Segment attachment: Laser welded
- Horsepower range: 8 - 20 hp
- Cutting method: Wet cutting
Frequently asked questions
How soon after the pour should I cut with this blade?
Green-concrete joint sawing generally happens within hours of finishing. Common industry guidance is a six to twelve hour window after the slab is finished, and not later than twenty-four hours, because beyond that the slab can begin cracking on its own. Mix design, slab thickness, wind and temperature all shift that window, so most crews test-cut a corner first: if the edges ravel it is too early, and if the blade leaves a clean slot you are in the window.
Why does green concrete need a different blade than cured concrete?
In green concrete the sand has not bonded into the mortar yet, so it runs loose in the slurry and acts as an abrasive against the blade. Green-concrete blades are built with a harder bond so the matrix holds its diamonds longer, plus undercut protection at the base of the segments to shield the steel core from that abrasive slurry. A cured-concrete blade used in a green slab tends to lose its core before it loses its diamond.
What saw does the MK-610W fit?
This blade has a 1 inch arbor and MK Diamond rates the MK-610W series for saws from 8 - 20 horsepower. Check your saw's arbor size and rated blade capacity against those numbers; a 12 inch blade needs a saw with guarding sized for that diameter.
Why choose the .250 inch kerf instead of a narrower blade?
A wider kerf is chosen when the joint itself needs to be wider, not because it cuts faster. Sealant guidance treats a quarter inch as the minimum width at which a joint can be properly cleaned and sealed without a second widening pass, so a .250 inch cut can serve as its own sealant reservoir. The trade-off is that a wider slot removes more material, takes more horsepower and is louder under traffic, so narrower is better where a sealed reservoir is not required.
Is this a wet-cutting blade?
Yes. The MK-610W is a wet-cutting blade and should be run with water. Water carries the slurry out of the cut and keeps the core and segments cool, which matters even more in green concrete where the slurry is at its most abrasive.
Discount Cleaning Products is a United States based supplier of MK Diamond cutting tools, and we stock the MK-610W line by part number so you get the exact diameter, kerf and arbor you ordered rather than a close substitute. If you are not certain which grade your saw should be running, or whether your slab is still green, call or email before you order and we will work it out with you against your saw's horsepower rating and your pour schedule.
