The MK Diamond MK-404D is the blade masons and concrete crews keep on the saw when the day is going to include more than one material. MK builds it as a general purpose high speed blade for concrete and masonry, laser welded for dry cutting, and this is the 12" size, part number 150403Z, at .125" wide on a 20mm arbor. Supreme is the top of MK Diamond's three blade grades and carries the highest diamond concentration of the three, which is why MK points it at saws in the 2 to 3 HP class and above. That matters on site because a hotter, denser diamond section is what lets one blade move from a block wall to a concrete pad to a run of pavers without stopping to swap wheels.
Built for
- Cut concrete block, hard brick and pavers on a cut-off or chop saw
- Trim cured concrete flatwork, curbs and footings
- Square hardscape units for walls, steps and retaining courses
- Handle mixed-material demolition and opening cuts
- Run dry on gas or electric high speed saws
Use cases
The first job is masonry unit cutting. Block, hard brick and paver work means a lot of repeated short cuts, and a crew loses more time to blade changes than to the cuts themselves. A supreme grade section is the answer to that - more diamond in the segment means the blade holds its cut rate deeper into the job, so the saw stays on the stand and the wall keeps going up.
The second is cured concrete. Flatwork, curb repairs, footing trims and doorway openings all ask the blade to enter hard, fully set material, which is where a thinner or softer wheel starts to wander. The laser-welded segment is the structural answer: the weld is what holds the segment to the core under the heat a dry cut generates, and it is MK's stated reason for specifying this family for dry cutting and safety.
Two practical points before ordering. This is a dry-cutting blade, so let it cool between deep passes rather than burying it in one continuous plunge - step cuts keep the core temperature down. And check your saw: MK points the supreme grade at machines of roughly 2 to 3 HP and up, because a low-power saw cannot push a high-concentration section hard enough to keep the diamonds exposed and cutting.
Specifications
- Manufacturer part number: 150403Z
- Model: MK Diamond MK-404D
- Blade family: Supreme Grade High Speed Blade for Concrete and Masonry
- Diameter: 12"
- Width (kerf): .125"
- Arbor: 20mm
- Rim style: segmented
- Construction: laser welded
- Use: dry cutting
- Grade: Supreme
- Material: concrete and masonry
Frequently asked questions
Is the MK-404D a wet or dry blade?
It is built for dry cutting. MK Diamond laser welds the MK-404D family for dry cutting and safety, so it runs on standard high speed cut-off and chop saws without a water feed.
What does Supreme grade actually mean?
Supreme is the top of MK Diamond's three blade grades and carries the highest diamond concentration of the three. MK recommends it for saws in roughly the 2 to 3 HP class and above, where there is enough power to keep a dense section cutting.
What materials will it cut?
Concrete and masonry. MK lists the MK-404D as a general purpose high speed blade for concrete and masonry materials, which covers block, hard brick, pavers and cured concrete.
What is the difference between part numbers ending in Z and those that do not?
The Z suffix is the 20mm arbor version of the same blade. The diameter and width are identical; only the arbor differs, so order by the spindle on your saw.
Should I plunge straight to full depth?
No. On a dry blade, step the cut in progressive passes and let the blade clear between them. That keeps the core temperature down and protects the segment welds.
Discount Cleaning Products is an authorized MK Diamond dealer. Our US-based team works with contractors, masons and stone fabricators every day, so if you are weighing one grade or arbor against another for the saw you already own, ask us before you order and we will help you match the blade to the work.