Dart Red Ten SGP-15 is a pro-grade diamond blade built for concrete, brick, paving, stone and roof tiles. The 15mm segment height gives you longer cutting life and solid speed on general purpose masonry work across a range of sizes.
Size
Price
QTY
115mm x 22mm
£5.28£6.34
125mm x 22mm
£6.99£8.39
230mm x 22mm
£19.30£23.16
300mm x 20mm
£27.92£33.50
The Dart Red Ten SGP-15 Pro Diamond Blade is a general purpose concrete cutting blade designed for tradespeople who cut masonry day in, day out. With a 15mm segment height, this blade delivers longer working life than many standard-segment blades in the same price bracket, and it keeps cutting speed up across a range of common masonry materials. Available in 115mm, 125mm, 230mm and 300mm bore sizes, the SGP-15 fits angle grinders and disc cutters in regular site use.
The 15mm segment is the headline here. Taller segments mean more diamond material in contact with the work before the blade wears to the core, which translates directly to more metres of cutting before you reach for a replacement. On a busy site cutting concrete blocks, kerbs, or reclaimed bricks, that adds up quickly. This is the kind of blade you keep a couple of in the van rather than running to the merchant every other day.
What the Dart Red Ten SGP-15 Cuts
The SGP-15 earns its general purpose label by handling the full range of common masonry materials without needing a specialist blade for each. Concrete products of all types are well within its capability, from cast concrete blocks to in-situ slabs. It works just as well on clay and engineering bricks, natural and reconstituted stone paving, and concrete roof tiles. If it is a masonry product you are likely to encounter on a typical construction, landscaping, or roofing job, this blade will cut it.
The smaller 115mm and 125mm sizes suit angle grinders for tighter work and adjustment cuts. The 230mm blade is the workhorse size for most cutting disc work, fitting standard 9-inch angle grinders used across groundworks and block-laying. The 300mm size is sized for disc cutters and larger hand-held saws where you need the depth of cut for thick kerbs, pavers, or structural block.
Segment Height and Cutting Life
The 15mm segment on the Dart SGP-15 sits noticeably above the 10mm segments found on budget blades, and it shows in practice. The extra segment height keeps the blade performing longer before the segment wears down to the point where cutting slows and heat build-up becomes an issue. On abrasive materials like soft brick or sandy concrete, taller segments make a real difference to how many cuts you get from a single blade.
At this price point, the SGP-15 represents a practical choice for trades who need consistent performance without spending on premium specialist blades for general masonry work. It is the sort of blade that holds its own on a commercial groundworks contract or a domestic driveway installation alike. Straightforward, dependable, and available in the sizes that actually get used.
Pro Tip: On abrasive materials like soft sand-cement blocks, dress the blade regularly by making short cuts into harder concrete to keep the segment cutting cleanly and prevent glazing.
The Dart Red Ten SGP-15 is used across construction, landscaping, groundworks and roofing trades wherever masonry cutting is part of the daily workflow. Builders use it for cutting concrete blocks and bricks to size on a block-laying course, groundworkers reach for it when trimming kerb stones and concrete edging, and landscapers rely on it for cutting natural and concrete paving slabs to fit. The 300mm size is particularly well suited to disc cutter work on thicker masonry units, while the 115mm and 125mm sizes cover angle grinder use in tighter spots and finishing work. Roof tilers working with concrete tiles will also find the SGP-15 handles that material reliably without needing a dedicated tile blade.
Best For
Concrete blocks and cast concrete
Clay and engineering bricks
Natural and concrete paving slabs
Kerb stones and concrete edging
Concrete roof tiles
General purpose masonry cutting
Available Sizes
115mm x 22mm bore
125mm x 22mm bore
230mm x 22mm bore
300mm x 20mm bore
Key Features
15mm segment height for extended blade life
General purpose segmented rim
Fits standard angle grinders and disc cutters
Suitable for dry cutting masonry
Not suitable for: The SGP-15 is not intended for cutting metal, timber, or plastic. It is also not the right choice for cutting hard porcelain or ceramic tiles, where a dedicated continuous rim tile blade would perform better.
Fit the Dart SGP-15 to your angle grinder or disc cutter, ensuring the blade size matches the tool guard and that the arbor bore is correct. Check the blade is seated securely before starting. Allow the blade to reach full speed before contacting the material, and let the blade do the cutting without forcing it into the work.
On abrasive materials, keep the blade moving steadily rather than dwelling in one spot, as stationary pressure builds heat and can glaze the segment. Score a guide line on the first pass if a clean, accurate cut is needed, then deepen on the second pass rather than trying to cut to full depth in one go on thick material.
Check the blade diameter and bore size match your angle grinder or disc cutter before fitting.
Fit the blade securely using the correct flange and locking nut, ensuring it is tight before use.
Confirm the blade guard is correctly positioned and the tool is set to the right guard size for the blade diameter.
Mark your cut line clearly on the masonry surface before starting.
Bring the tool to full speed before lowering the blade onto the material.
Cut at a steady, controlled pace, letting the diamond segment work without forcing the blade.
On thick or hard masonry, score a shallow guide cut first, then deepen on subsequent passes.
Allow the blade to cool periodically during extended cutting sessions, particularly on abrasive soft materials.
What materials can the Dart Red Ten SGP-15 cut?
The SGP-15 is rated for concrete products, clay and engineering bricks, natural and reconstituted stone paving, kerb stones, and concrete roof tiles. It is a general purpose masonry blade and handles the range of materials typically encountered on construction, groundworks, and landscaping jobs.
Is the SGP-15 suitable for wet or dry cutting?
The SGP-15 is designed for dry cutting in general site use. If you are using it on a disc cutter with a water feed, check the blade specification for your specific size before use, as the standard general purpose configuration is optimised for dry cutting with adequate ventilation.
Why does segment height matter when choosing a diamond blade?
Segment height determines how long the blade keeps cutting before wearing down to the steel core. The 15mm segments on the SGP-15 give more usable diamond material than 10mm budget blades, so the blade stays productive for longer, particularly on abrasive materials like soft brick or sandy concrete.
The Dart Red Ten SGP-15 uses a segmented rim construction with 15mm diamond-impregnated segments brazed to a steel core. The segmented design allows heat to dissipate between segments during dry cutting, reducing thermal stress on the blade. The 22mm bore on the 115mm, 125mm, and 230mm sizes is the standard fitting for most angle grinders in common site use, while the 300mm version uses a 20mm bore to suit larger disc cutters.
Brand
Dart
Model
Red Ten SGP-15
Blade Type
Segmented rim diamond blade
Segment Height
15mm
Available Sizes
115mm x 22mm, 125mm x 22mm, 230mm x 22mm, 300mm x 20mm
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