This is the top of MK Diamond's wet cured-concrete line in the smallest diameter and the narrowest kerf. The MK-525 is MK's Supreme Grade blade - rated Best on cured concrete in MK's own application chart, carrying a 15mm segment where the Premium 505 carries 12mm, and built for the 12 to 25 horsepower saws that concrete cutting contractors run day in and day out. At 12-inch diameter with a .125-inch kerf, this is the joint-and-shallow-trench version: a thin cut that a strong saw pulls quickly.
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 step up to the 525. 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 blade in MK's cured-concrete family rated at all where the sand is abrasive. The Premium 505 and Standard 500 are both marked not recommended in hard aggregate. If your mix chews up blades, this is the tier that answers 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: 134890
- Diameter: 12-inch (305mm)
- Width (kerf): .125-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 134890 and part 134908?
Kerf width. Both are MK-525 Supreme Grade blades at 12-inch diameter with a 1-inch arbor and a 15mm segment. Part 134890 is .125-inch wide and part 134908 is .250-inch wide. The narrow one asks less of the saw; the wide one is the heavier-duty cut. Pick by what your saw is rated for and what the job calls for.
Why choose the MK-525 over the MK-505?
Aggregate and segment height. MK rates the 525 Best on cured concrete and Best on hard aggregate with non-abrasive sand, and marks the 505 not recommended there. The 525 also carries a 15mm segment against the 505's 12mm, which is what sets usable blade life.
What saw does this need?
MK publishes a 12 to 25 horsepower range for the MK-525, a step up from the 8 to 20 hp band on the 505. A saw below that band will lug and glaze this blade rather than cut with it.
Does it cut green concrete?
MK lists the 525 under wet cutting cured concrete and sells separate green-concrete and early-entry lines. The cured-concrete chart says nothing about green concrete, so we will not claim it.
Is a 12-inch blade enough for a control joint?
For typical control and contraction joints in a slab, yes - joints are cut to a fraction of slab depth, not through it. If you need to cut all the way through the slab, step up in diameter and check your saw's depth-of-cut rating first.
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.
