Masonry cutting and grinding is dominated by 100mm and 125mm cordless brushless angle grinders in the 800-1000W class, paired with diamond-segmented blades and dust shrouds [S1][S2].
Selection hinges on three coupled variables: disc diameter (which sets cut depth and kerf), motor power (which sets feed rate on stone), and dust extraction (which sets site compliance). For a brick-and-block trades workflow on site, 100/125mm bodies are the de-facto standard, while 230mm (9-inch) corded machines handle deep cutting of pavers and concrete pipe [S2][S4].
Disc Diameter vs Cut Depth on Stone
Disc diameter directly sets the usable cut depth: a 100mm disc cuts roughly 25-30mm deep, a 125mm disc roughly 35-40mm deep, and a 230mm (9-inch) disc up to roughly 70mm deep on a single pass [S4]. The Lingdatek LDG03 20V brushless cordless 100/125mm grinder (800W, 5500-7300 RPM) covers the bulk of masonry dressing work, while the 230mm class machines on Alibaba list 9-inch (230mm) "high performance" housings for heavier paver and pipe cutting [S1][S4].
For most masonry cleaning, mortar-rake-out, and shallow chase work, a 125mm body is the sweet spot. For deep cuts through 60mm concrete pavers or terracotta pipe, step up to 180mm or 230mm corded machines.
Power Class, RPM, and Corded vs Cordless
Cordless 20V brushless 100/125mm bodies now reach 800W continuous and 6800-7300 RPM no-load, comparable to entry-level corded 800-900W machines for short-cycle masonry work [S1]. MuDa's T125-series corded angle grinders sit in the same disc class for continuous shop duty, where sustained torque matters more than portability [S2].
For a 100/125mm masonry workload: cordless is fine for intermittent dressing, chase cutting, and small openings. Corded (1000-1400W) is the right call for a full day of paver trimming or concrete grinding, where battery heat-soak and amp-hour limits will throttle a cordless platform. The 230mm/9-inch class is almost universally corded because of the power demand.
Wheel / Disc Type for Masonry
For cutting stone, brick, and cured concrete, use a diamond-segmented blade matched to the material: continuous-rim for tile and glazed brick, segmented for general concrete and paver cutting, turbo for faster cut with cleaner edge. For surface grinding and mortar removal, use a diamond cup wheel (single or double row) on the same grinder body [S5].
Made-in-China listings show 4-inch (100mm), 4.5-inch (115mm), and 5-inch (125mm) thin glass/diamond blades and cup wheels as the standard SKUs for masonry angle-grinder use [S5]. Sanding flap discs are the wrong choice on stone: they glaze over and shed grit; reserve them for metalwork.
Dust Extraction and Site Compliance
Masonry grinding generates crystalline silica dust, and angle-grinder selection is incomplete without a dust shroud plus Class M extractor pairing. The key spec is a 125mm (or 100mm) closed shroud that attaches to the grinder's guard ring and a 32-50mm hose port to the extractor. [S1]
Without extraction, a 125mm grinder on concrete can exceed respirable dust limits within minutes. Cordless platforms complicate this because the shroud has to clear the battery foot; verify shroud-battery clearance on the specific LDG/Lingdatek or T125 body before buying.
What It Is For, What It Is Not For
100-125mm brushless cordless or 800-1400W corded angle grinders with diamond blades and a dust shroud are built for: brick and block dressing, mortar raking, paver trimming, tile and stone cutting, surface grinding with a cup wheel, and small concrete chase openings. They are not built for: demolition of reinforced concrete (use a rotary hammer or demolition-spec grinder), continuous heavy concrete grinding (use a floor grinder), or long-duration road-cutting (use a dedicated road-maintenance grinder setup). [S1]
For larger concrete-surface grinding, a dedicated concrete angle grinder with a wider cup wheel and integrated dust port is the proper tool, not a 125mm hand body.
Selection Criteria Comparison: 100mm vs 125mm vs 230mm
On four decision axes for masonry work: cut depth (100mm ≈25-30mm, 125mm ≈35-40mm, 230mm up to ~70mm), power demand (100/125mm handled by 800-1000W cordless or 1000-1400W corded; 230mm requires 2000W+ corded), portability (cordless 100/125mm is best in class, 230mm is essentially site-cart only), and dust volume (100mm < 125mm < 230mm, so extraction scales with disc size) [S1][S2][S4]. The 125mm is the lowest-size class that can grind a 40mm-deep mortar joint in one pass, which is why most masons standardize on it.
If the workload is intermittent and site power is unreliable, choose 100mm cordless. If the workload is daily and varied, choose 125mm cordless with a backup corded body. If the workload is paver yards or pipe cutting, step to 180-230mm corded only.
Verifiable Spec Anchors and Standards
MuDa's T11001 marble cutter and T125-series angle grinders are explicitly positioned for stone-material markets and ship/highway/rail applications, confirming masonry-class construction with continuous-duty motors [S2]. The Lingdatek LDG03 spec sheet lists 800W output, 5500-7300 RPM no-load, 100/125mm disc compatibility, and a 5.0Ah battery pack for the cordless masonry class [S1].
Track the next 6 months for: (a) wider availability of 125mm closed shrouds sized for 20V battery feet, and (b) more 1000W-class cordless bodies entering the masonry SKU list, which would let 125mm cordless fully replace 1000-1400W corded on most sites.
The underlying component specifications are covered under angle grinder, and fettling grinder.