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Masonry & Surface Prep

PRODIAMANT Mortar Mole carbide grout cutter for angle grinders, front view showing 3 tungsten carbide cutting edges

PRODIAMANT Mortar Mole Carbide Grout Cutter – Mortar Joint Cleaning Wheel for Brick & Masonry (5/8"-11 Angle Grinder Mount)

PRODIAMANT Professional

$32.70
PRODIAMANT diamond cup wheel for grinding concrete, masonry and stone, view of the diamond segment layout

Diamond Cup Wheel for Masonry & Stone

PRODIAMANT Professional

From
$33.70

Surface prep on masonry comes down to three jobs: cutting out old mortar, grinding the substrate, and controlling the dust. The Mortar Mole Carbide Grout Cutter handles lime and soft-to-medium mortar joints. The Diamond Cup Wheel grinds concrete and stone flat and strips coatings. Everything in this category mounts on a standard US angle grinder – 5/8"-11 spindle or 7/8" arbor, depending on the tool. Read the guide below before you pick, because the wrong tool for your mortar wastes time and bricks.

Removing Mortar: Carbide vs. Diamond

The Mortar Mole Carbide Grout Cutter is built for lime mortar and soft-to-medium joints – the kind found in most older brickwork. It clears joints fast and threads directly onto a 5/8"-11 angle grinder spindle, no arbor nut needed. Be honest about your mortar before you buy: hard, modern Portland cement mortar wears carbide teeth down quickly. For hard joints, use the Mortar Mole Diamond Tuck Point Blade instead. Diamond grinds Portland mortar without giving up its edge. Test a small section first. If the carbide wheel struggles, switch tools – forcing it just burns up the cutter.

Grinding and Coating Removal

For leveling concrete, smoothing stone, and stripping paint, adhesive, or thinset, use the Diamond Cup Wheel. It grinds the surface flat instead of cutting into it. Keep the wheel moving in overlapping passes and let the diamond segments do the work – leaning on the grinder overheats the segments and slows removal. For deep cuts and heavy stock removal in concrete and block, the ConcreteBear Sintered Diamond Saw Blade with its 10 mm block segment is the right tool.

Dust Control on the Jobsite

Grinding and cutting masonry releases respirable crystalline silica. On US jobsites, OSHA 29 CFR 1926.1153 applies. The practical setup for angle grinder work is a dust shroud connected to a HEPA vacuum, which captures dust at the source and keeps your sightline clear. Check OSHA’s Table 1 for your specific task – some tasks, including mortar removal, still require a respirator even with vacuum dust collection. Plan dust control before the first cut. Retrofitting it mid-job costs more than starting right.

Frequently Asked Questions

Carbide grout cutter or diamond tuck point blade – which one do I need?
It depends on the mortar. The carbide grout cutter is fast in lime and soft-to-medium mortar, common in older brickwork. Hard Portland cement mortar wears carbide quickly – use the Diamond Tuck Point Blade for that. Test a joint before committing.
Will these tools fit my angle grinder?
The Mortar Mole Carbide Grout Cutter threads onto a standard US 5/8"-11 spindle. The Diamond Tuck Point Blade fits 7/8" and 5/8" arbors. Check your grinder's spindle type and maximum RPM before mounting.
What do I use to grind a concrete surface flat?
A diamond cup wheel on an angle grinder. It removes high spots, old thinset, adhesive, and coatings in overlapping passes. For cutting deep joints or openings rather than grinding, use a diamond saw blade instead.
Do I need a dust shroud for mortar removal?
On US jobsites, yes in practice. OSHA 29 CFR 1926.1153 covers silica dust from grinding masonry, and a shroud with a HEPA vacuum is the standard control. Table 1 lists mortar removal as a task that also requires a respirator.
Will the grout cutter damage my bricks?
Not if you stay in the joint. The cutting wheel is narrower than a typical mortar joint, so guide the grinder steadily along the joint line. Carbide removes soft mortar much faster than fired brick, which gives you a margin for error – but it is not a guide rail, so work with control.