Hard brick is unforgiving on a diamond blade. It is dense enough to polish a bond meant for block, and abrasive enough in places to punish one meant for stone, which is why a blade bonded specifically for brick and block outlasts a general purpose rim in that material. The MK Diamond MK-414D family is bonded for exactly that. This is the 4-inch size, a dry cutting segmented blade sized for a small angle grinder and intended for the mason, remodeler or repair crew making cuts on the wall rather than at the saw.
Use cases
- Cutting hard brick to fit at openings, returns and closures where carrying units to a saw is impractical
- Notching and trimming block in place on repair and remodel work
- Cutting out damaged brick during small masonry repairs
- Dry cutting on occupied or finished sites where slurry and water runoff are unacceptable
Segmented rim and dry cutting
A segmented rim carries gullets between the diamond segments. Those gaps let debris escape the cut and let air move across the steel core, which is what keeps a blade cool enough to run without water. The trade is edge quality: a segmented rim cuts faster and cooler than a continuous rim but leaves a rougher arris, which is the right trade on structural brick and block and the wrong one on a finished decorative face.
Working a small blade
A 4-inch blade has limited depth of cut, so most brick will need to be scored from both faces and snapped, or cut from both sides to meet in the middle. Let the blade do the work at its own rate. Forcing a small diamond blade generates heat faster than a dry rim can shed it, and overheating is what warps cores and strips segments.
Specifications
- MK Diamond part number 150720, MK-414D series
- 4-inch (102 mm) diameter
- 0.080-inch rim width
- 20mm-5/8-inch arbor
- 10 mm segment height
- Segmented rim
- Dry cutting
Frequently asked questions
What materials is the MK-414D intended for?
MK Diamond lists the MK-414D family for hard brick. It is bonded for dense fired masonry and block rather than for asphalt, green concrete or hard stone such as granite.
What arbor does this blade use?
It is supplied with a 20mm-5/8-inch arbor, the combination fitting used on most small angle grinders. Confirm the spindle size on your grinder before ordering.
How deep will a 4-inch blade cut?
Less than half the blade diameter once the guard and arbor are accounted for, so a standard brick will generally need to be cut from both faces. Do not attempt to gain depth by tilting or forcing the blade.
Can this blade be run wet?
MK Diamond lists the MK-414D in its dry cutting blade line. Follow the operating instructions supplied with the blade and with your grinder regarding any use of water.
Why does the segment height matter?
Segment height is the usable diamond depth on the rim. At 10 mm it indicates how much material can wear away before the blade reaches the end of its service life, which is the practical measure of how much cutting the blade has in it.
Discount Cleaning Products is an authorized MK Diamond dealer and supplies diamond blades, surface preparation equipment and jobsite consumables to contractors and facility maintenance teams across the United States, with US-based service and support.
