If you need to knock down form marks, remove high spots or rough-grind a slab flat before a coating or overlay goes down, the MK Diamond MK-304SG-2 4-inch cup wheel (part number 155686) is built for that job. It is a premium grade double row diamond cup wheel with 16 segments and a 5/8-11 threaded nut, and MK Diamond rates it for wet or dry grinding. It is a surface grinding tool, not a cutting blade: you mount it on an angle grinder or walk-behind prep machine and let the segments abrade the concrete or stone face.
Use Cases
- Removing form marks and fins from poured or tilt-up concrete walls and slabs.
- Concrete deburring and rough-surface grinding ahead of sealers, epoxy or overlays.
- Edge, corner and patch grinding where a large machine will not fit.
- Dry grinding with a dust shroud and vacuum, or wet grinding where slurry control is easier than dust control.
Why this size and mount
The 4-inch size is the detail wheel: it fits small angle grinders and gets into edges, corners and patch work a large machine cannot reach. Double row construction gives it 16 segments, twice the 8 on the single row 4-inch MK-304CG-1. This version uses a 5/8-11 threaded nut, which is the 5/8-11 thread found on many angle grinder spindles. Check your grinder spindle before ordering.
Specifications
- MK Diamond part number: 155686
- Series: MK-304SG-2, Premium Grade, double row
- Diameter: 4-inch
- Segments: 16
- Segment height: 6mm
- Mounting: 5/8-11 threaded nut
- Use: wet or dry
Frequently asked questions
Can I use the MK-304SG-2 cup wheel wet or dry?
Yes. MK Diamond lists this cup wheel for both wet and dry use. Dry grinding should be paired with dust control.
What is the difference between the 4-inch MK-304SG-2 and the other sizes in the line?
MK Diamond makes this series in 4, 5 and 7 inch diameters, and the segment count rises with the diameter. Pick the diameter your grinder or machine is rated for.
How do I know whether I need the arbor or the 5/8-11 nut version?
Match the wheel to your grinder spindle. MK sells this wheel with a 7/8-inch to 5/8-inch arbor or with a 5/8-11 threaded nut under different part numbers. This listing is the 5/8-11 threaded nut version.
Is this a cutting blade?
No. Cup wheels grind a surface flat. For cutting slots or sawing, use a diamond blade.
Discount Cleaning Products is an authorized MK Diamond dealer with US-based order support for floor prep and surface prep tooling.
