MK Diamond MK-625W 12-inch x .110-inch x 1-inch Blade for Asphalt Over Concrete - 150236
When a street or slab has been blacktopped over an old concrete base, one cut has to pass through two materials that want opposite things from a diamond blade. Asphalt is soft and abrasive; the concrete underneath is hard and far less abrasive. The MK Diamond MK-625W is built for exactly that cut. It is a supreme grade wet-cutting segmented rim blade in 12-inch x .110-inch x 1-inch, made for utility, road-maintenance and concrete-cutting crews running a walk-behind wet saw, and it takes the guesswork out of mounting a blade when nobody knows how much asphalt and how much concrete is in the section.
Built for these jobs
- Cutting full depth through an asphalt overlay into the original concrete road or slab underneath
- Trench and utility cuts across resurfaced streets, where the layer thicknesses are unknown until the saw is in the cut
- Patch boundaries and saw-cut edges on municipal and county pavement repair
- Curb-and-gutter tie-ins where a concrete base meets an asphalt surface course
- Mixed-material work on a walk-behind saw in the 8 to 20 hp class
Where this size fits
The 150236 is the thinnest kerf MK publishes at 12-inch. At .110-inch this is the thinnest 12-inch blade in the series. A thin kerf removes less material per foot, which means less load on the saw and less spoil to clear, and it is the usual starting point when the cut only has to be a cut.
How a wet cutting segmented rim blade works
The diamond rim is divided into separate segments laser welded to a tensioned steel core, with gullets between them. Those gaps clear slurry and spoil out of the cut, keep the blade from binding, and let cooling water reach the diamond. A diamond blade does not slice - it grinds, and the segment wears back as it works so fresh diamond is continuously exposed. That is why a blade that stops cutting while segment height remains is almost always glazed rather than worn out.
Specifications
- MK Diamond part number: 150236
- Series: MK-625W, Supreme Grade
- Diameter: 12-inch
- Width (kerf): .110-inch
- Arbor: 1-inch
- Segment height: 12 mm
- Segment attachment: laser welded
- Cutting method: wet
- Published horsepower range: 8 to 20 hp
- Series diameter range: 10-inch through 36-inch
- Rated application: asphalt over concrete
Matching the blade to the material
MK rates the MK-625W Best for asphalt over concrete and not recommended for plain asphalt. That second half is not a technicality. MK keeps its plain-asphalt blades (the MK-700W, MK-705W and MK-710W) and its asphalt-over-concrete blades in separate families and marks each group not recommended for the other group's material. Run a concrete-bonded blade in abrasive asphalt and it cuts fast, then gives up its diamond early. Run an asphalt-bonded blade into hard concrete and it glazes over, stops cutting and builds heat while most of the segment is still there. The asphalt-over-concrete family exists so that one blade survives both layers of the same cut.
The MK-625W is the Supreme-grade blade in MK Diamond's wet-cutting asphalt-over-concrete group. It carries a 12 mm segment against the Premium MK-615W's 10 mm, and it is the only series in the group MK takes past 30-inch.
Getting full life out of the blade
This is a wet blade and water is not optional - a blade built to run wet will burn if it is run dry. Water cools the core, carries slurry out of the kerf and knocks down the dust. Cut in steps rather than dropping the blade to full depth in one pass, and never rotate the saw with the blade still in the cut, which is how segments get bent and broken. If the blade goes shiny and quits cutting with segment left, dress it by running it through a soft abrasive material to re-expose the diamond.
Frequently asked questions
Can I use this blade on plain asphalt?
It is not the rated application. MK rates the MK-625W not recommended for plain asphalt and rates it Best for asphalt over concrete. For full-depth asphalt with no concrete in the cut, MK's plain-asphalt series (MK-700W, MK-705W, MK-710W) is the correct family.
Can I run it dry?
No. This is a wet-cutting blade and it needs a continuous water supply. A blade built to run wet will overheat and burn if it is run dry, and water is also what controls the dust on a walk-behind saw.
What size saw does it need?
MK publishes a 8 to 20 hp range for this series. Confirm your saw's rated horsepower and its maximum blade capacity before ordering, because the horsepower range is published once for the whole series rather than per diameter.
What arbor does it take?
A 1-inch arbor. MK publishes a 1-inch arbor on every size in this series.
My blade stopped cutting but the segments still look good. Is it finished?
Usually not. That is glazing, not wear. The diamond faces have polished over and stopped biting. Dressing the blade by cutting a soft abrasive material will typically bring it back, and it is worth trying before replacing a blade that still has segment height left.
How deep can I cut with a 12-inch blade?
Well under half the blade diameter, and the practical figure depends on your saw rather than the blade. MK does not publish a maximum depth of cut per blade. Step the cut down in passes instead of burying the blade on the first one.
Buying MK Diamond blades from Discount Cleaning Products
Discount Cleaning Products is an authorized MK Diamond dealer with US-based support. If you are not sure whether your section is asphalt over concrete or full-depth asphalt, or which diameter and kerf suits the saw you already own, call or message us with the saw model and what you are cutting and we will point you at the right part number rather than the nearest one.
