Choose the right diamond blade size for your tool, your job, and your cutting depth — without wasting time or money.
✔ Match blade to your tool
✔ Get the right cutting depth
✔ Avoid costly mistakes
Blade Size | Tool | Best For |
115mm | Small grinder | Tiles, light work |
125mm | Grinder | General site work |
230mm | Large grinder | Deeper cuts |
350mm | Petrol saw | Concrete & asphalt |
450mm+ | Floor saw | Heavy-duty |
❌ Too small → can’t finish the cut
❌ Too big → unsafe or won’t fit
✔ Right size → faster, cleaner, safer
Match the Blade Size to Your Tool
Never fit a blade larger than your machine is rated for.
Cutting Depth (Simple Rule)
Rule of thumb:
Cutting depth ≈ ⅓ of blade diameter
Match Size to the Job
Not Sure What Diamond Blade Size You Need?
Most contractors only need 2–3 blade sizes to cover nearly all site work.
👉 General work → 125mm
👉 Deeper cuts → 230mm
👉 Concrete work → 350mm petrol saw
Most Popular Diamond Blade Sizes (UK)
Built for Site Work — Not DIY
Our blades are selected for real site conditions — fast cutting, long life, and reliable performance in concrete, asphalt, and hard materials.
✔ Trade-tested
✔ Reliable performance
✔ No-nonsense selection
The right size depends on your tool and how deep you need to cut.
Most contractors use 125mm and 350mm blades to cover the majority of jobs.
No — never fit a blade larger than your grinder is rated for.
Using an oversized blade is unsafe and can damage the tool or cause serious injury. Always match the blade size to the machine specification.
As a rule of thumb:
Cutting depth ≈ one-third of the blade diameter
For deeper cuts, you’ll need a larger blade or a petrol saw.
For most concrete work, a 300mm to 350mm blade on a petrol saw is the best choice.
Smaller blades can cut concrete, but you’ll need multiple passes and it will be slower and less efficient.
Need a compact everyday option? Our 230mm concrete cutting blade is popular for grinders and general site work.
A 9” angle grinder uses a 230mm diamond blade.
This setup is commonly used for deeper cuts in concrete, brick, and blockwork.
Not necessarily — but they do cut deeper and more efficiently on larger jobs.
Using the correct size blade for the job reduces cutting time and puts less strain on both the tool and the operator.
