This is the heavy-kerf version of MK Diamond's top cured-concrete blade at 12 inches. The MK-525 is MK's Supreme Grade - rated Best on cured concrete in its own published application chart, with a 15mm segment against the Premium 505's 12mm - and this part number carries a .250-inch kerf, twice the width of the thin version in the same family. Contractors buy the wide kerf when the cut has to be a slot rather than a line: wider joints, cuts that need clearance, and work where a thin blade wanders.
Built for
- Flat sawing cured slabs, roadway and bridge deck for trench, utility and demolition layout.
- Cutting control and expansion joints where the slab has already gained strength.
- Squaring and removing failed sections of sidewalk, curb, apron and warehouse floor.
- Concrete cutting contractors and municipal crews running self-propelled or push flat saws.
- Rental fleets stocking a blade that matches the 12 to 25-horsepower saws in the yard.
Use Cases
MK Diamond ranks its wet cured-concrete blades in three tiers and publishes exactly where each one belongs. On cured concrete the MK-500 is rated Good, the MK-505 Better and the MK-525 Best. The MK-525 is the Best blade in that chart.
Aggregate is the reason to be in the 525 tier at all. MK rates it Best for hard aggregate with non-abrasive sand and Best again for soft aggregate with abrasive sand, and it is the only cured-concrete blade MK rates where the sand is abrasive. The Premium 505 and Standard 500 are marked not recommended in hard aggregate. If your mix eats blades, this is the tier built for it.
Why segment height and horsepower decide your cost per foot
Segment height is the spec that actually sets usable life. Across MK's cured-concrete line the segment grows from 10mm on the MK-500 to 12mm on the MK-505 to 15mm on the MK-525, and every additional millimeter is cutting you have not paid for twice. Contractors who track this talk about cost per foot rather than sticker price, and it is the reason a shop will run an expensive blade on production work and a cheap one on the occasional cut.
Horsepower matching matters just as much. MK publishes a 12 to 25 hp band for the MK-525. An underpowered saw lugs and glazes the blade instead of cutting; an oversized saw burns through a blade built for a lighter machine. Match the blade to the saw you actually own and both last longer.
This is a wet blade. Keep water on it, use step-down passes rather than one deep plunge, and keep the blade out of the sub-base where slurry will undercut the core beneath the segments.
Specifications
- Model: MK Diamond MK-525, Supreme Grade for cured concrete
- Manufacturer part number: 134908
- Diameter: 12-inch (305mm)
- Width (kerf): .250-inch
- Arbor: 1-inch
- Segment height: 15mm
- Horsepower range: 12 to 25 hp
- Construction: laser welded
- Cutting method: wet only
- MK application rating on cured concrete: Best
- Available in this family: 12-inch through 48-inch
Frequently asked questions
What is the difference between part 134908 and part 134890?
Kerf width, and only kerf width. Both are MK-525 Supreme Grade blades at 12-inch diameter, 1-inch arbor, 15mm segment. Part 134908 is .250-inch and part 134890 is .125-inch. The wide kerf cuts a slot and resists wander; the narrow one asks less horsepower for the same depth.
When do I want a .250-inch kerf instead of a thin blade?
When the cut needs width - widening an existing joint, creating clearance for a patch or seal, or cutting in material where a thin blade tends to wander. It removes twice the material, so expect it to ask more of the saw at the same depth.
Why choose the MK-525 over the MK-505?
MK rates the 525 Best on cured concrete and Best on hard aggregate with non-abrasive sand, while marking the 505 not recommended there. The 525 also carries a 15mm segment against the 505's 12mm, which is what sets usable life.
What horsepower saw does this need?
MK publishes a 12 to 25 horsepower range for the MK-525. A wide kerf at the low end of that band will feel slow; give a .250-inch blade the power it needs or it will glaze instead of cut.
Does it have to run wet?
Yes. This is a wet-cutting blade. Keep water on it, cut in step-down passes on deep work and stay out of the sub-base, where slurry undercuts the steel core below the segments.
Discount Cleaning Products is an authorized MK Diamond dealer. Blades ship direct from stocking inventory, orders are handled by a US-based team that works with contractor and municipal purchasing every day, and we can help confirm arbor, kerf and horsepower against your saw before you order.
