Segmented Diamond Blade for Granite and Marble

This segmented diamond blade is designed for professional wet cutting of hard granite in tombstone manufacturing workshops, slab fabrication facilities, and stone yards across South Africa. Engineered to handle the hardest natural granite varieties found in the local market — including Rustenburg Black, Ivory White, and Zimbabwe Black — this blade combines high frequency manufacturing technology, a high resistance steel core, and an optimised segment design to deliver chip-free cuts, high operating speed, and a long working life at an excellent price-performance ratio.

The segmented rim design features evenly spaced diamond-impregnated segments separated by open gullets. On hard granite — one of the most abrasive and segment-destructive natural stones — these gullets are essential. They allow water to reach the cutting face during wet use, dissipate the significant heat generated when cutting dense stone at production speeds, and provide a channel for slurry and stone dust to exit the cut. Without adequate cooling and debris clearance, even a quality diamond blade will glaze over and stop cutting efficiently on hard granite.

Available in four diameters from 230mm through to 500mm, this blade covers every workshop machine from large-disc angle grinders and compact table saws through to full-size bridge saws and large slab-cutting machines. Both silent centre and standard variants are available — the silent centre design reducing blade noise and vibration in production workshop environments.

Best For

• Hard granite slab work in tombstone manufacturing workshops
• Rustenburg Black, Ivory White, Zimbabwe Black, and similar hard South African and imported granite varieties
• High-volume slab sizing and profiling in stone fabrication facilities
• Countertop slab through-cuts on granite bridge saws and table saws
• Monument and memorial stone fabrication
• Stone yards and suppliers sizing granite slabs for customers
• Any application requiring fast, chip-free wet cutting of very hard natural granite

Available Sizes

This blade is available in four diameters to suit different machines and cutting depths:

• 230mm — fits large-disc angle grinders (22.23mm bore). Used for hand-held slab profiling, edge work, and detail cuts on thicker granite pieces.
• 350mm — fits floor saws and medium table saws (25.4mm bore). Suited to production slab cutting in smaller fabrication workshops.
• 400mm — the most widely used size in South African tombstone and countertop workshops. Fits standard bridge saws and large slab-cutting machines (25.4mm bore). Provides the cutting depth needed for full-thickness granite slabs in a single pass.
• 500mm — for large-format slab cutting machines and high-production bridge saws handling extra-thick or oversized granite slabs.

Contact us to confirm bore size and segment specifications for your required diameter before ordering.

Silent Centre vs Standard — Which to Choose

This blade is available in two steel core variants:

• Standard core: The conventional steel disc design. Reliable, cost-effective, and suited to outdoor or open stone yard environments where noise levels are less of a concern.
• Silent centre core: Features laser-cut expansion slots and copper or resin damping inserts in the steel core that absorb vibration and reduce the resonant noise generated during high-speed granite cutting. The silent centre variant is the preferred choice for enclosed workshops, production facilities, and environments where operators are exposed to sustained blade noise throughout a working day.

High Frequency Technology — What It Means for Blade Performance

High frequency manufacturing refers to the use of high-frequency induction welding or sintering processes in the production of the diamond segments. This technology produces a more uniform and consistent diamond distribution throughout the segment matrix compared to conventional cold-press sintering, resulting in:

• More consistent cutting performance throughout the blade’s working life
• Better diamond exposure at the cutting face, maintaining sharpness for longer
• Improved segment bond strength under the sustained heat and pressure of hard granite cutting
• A longer overall blade lifespan and lower cost-per-metre on production cutting contracts

Why Wet Use Only

Hard granite generates exceptional heat at the blade-stone interface during cutting. Without water cooling, this heat builds rapidly in the steel core and segment bond, causing thermal expansion of the core, softening of the segment matrix, premature diamond glazing, and in severe cases, segment separation. Water cooling eliminates this risk entirely — keeping the blade at safe operating temperature, extending the diamond layer’s working life, suppressing silica dust, and flushing stone slurry from the cut to maintain a clean cutting face.

This blade must not be used dry. Always ensure adequate water flow to the blade before beginning any cut.

Safety & PPE

Large-diameter diamond blades on bridge saws, table saws, and floor saws operate at high speed and generate stone slurry, flying debris, and significant noise. Always observe the following:

• Ensure water supply is connected and flowing before beginning any cut
• Wear a full face shield and safety glasses at all times
• Wear hearing protection — particularly important with the standard core variant in enclosed workshops
• Wear waterproof outerwear and rubber boots to protect against stone slurry
• Wear an appropriate dust mask — granite contains crystalline silica, a serious respiratory hazard
• Inspect the blade before every use for cracks, missing segments, or core deformation
• Ensure the blade is correctly mounted and guards are in position before starting the machine
• Keep bystanders clear of the cutting area