Concrete Diamond Blades

Diamond blade for concrete — construction and how it cuts

A diamond blade is a steel disc (the core) with a working part fixed around its edge — either segments or a continuous rim made of sintered diamond crystals held in a metal bond called the matrix. During cutting the diamond does not "saw" the concrete like a toothed blade; it grinds it: exposed crystals scrape particles off the material, and once a grain wears down it breaks out and reveals the next one. That is why the tool life and cutting speed are decided not by the diamond alone, but by the hardness of the bond matched to the material being cut.

Medium-hard concrete calls for a hard bond, while heavily reinforced concrete and highly abrasive materials (fresh concrete, asphalt) call for a soft bond that exposes fresh crystals faster. The NORWIT.PL range is dominated by Tyrolit blades and the professional Cedima BET-GOLD and EC Diabolik series. Below we explain the differences between blade types, how to match the diameter to the machine, and how to pick the bond hardness for reinforced concrete.

Types of diamond blades for concrete — segmented, continuous, turbo and cup

The shape of the rim decides whether a blade cuts dry, wet, and how clean an edge it leaves. For concrete and reinforced concrete a segmented blade is the usual choice; continuous and cup wheels have narrower, specialised uses.

This category is part of the diamond blades section, where you will also find blades for other materials: to cut a slab right after pouring — blades for fresh concrete (as early as 1–2 h after casting), for bituminous surfaces — blades for asphalt, and for tiling — continuous blades for ceramic tiles. Choosing the right type often matters more than the brand: a concrete blade run on asphalt will glaze over and stop cutting.

Choosing the blade diameter for your machine — Ø 125, 230, 350 and 500 mm

The blade diameter has to match the machine and it sets the maximum cutting depth (roughly half the difference between the blade diameter and the guard flange). The arbor is matched to the spindle: smaller blades use 22.2 mm (angle grinders), larger ones use 25.4 mm (cut-off saws and floor saws), and reducing rings let you adapt between the two.

The Ø 115–500 mm span covers the entire NORWIT.PL range — Ø 350–500 mm blades from Tyrolit, Cedima and Altrad Belle mount on saws, while for hand-held grinder work Ø 125 or 230 mm is usually enough.

Reinforced concrete and bond hardness

Reinforced concrete (concrete cast around steel bars) is harder to cut than plain concrete: the steel it meets clogs the bond and "polishes" the segment. The key is choosing the matrix hardness and the diamond concentration correctly. The rule is counter-intuitive: the harder and more heavily reinforced the material, the softer the bond, because a soft matrix wears away faster and keeps exposing fresh, sharp crystals.

For regular cutting of reinforced concrete it pays to spend more on a professional blade — a segment that is usually 10–12 mm tall gives many times the working life of a hobby blade with a segment of about 7 mm. Water cooling further extends life and reduces the silica dust that is dangerous to the respiratory system.

Brands and models of concrete blades at NORWIT.PL

We focus on the professional range that is missing from offers dominated by DIY-store blades. Above all we carry Tyrolit blades — an Austrian maker with a line-up from universal to premium reinforced-concrete blades, in the Ø 115–500 mm span for dry and wet cutting. These are complemented by the professional Cedima series: the segmented BET-GOLD PLUS with a high diamond concentration (e.g. Ø 230 mm) for reinforced concrete, and the high-output EC Diabolik for cut-off saws (e.g. Ø 350 mm, 25.4 mm arbor). You will also find Nozar blades for masonry and hollow blocks, specialist Dr. Schulze blades for abrasive materials, and Altrad Belle Ø 350–500 mm blades for Belle cutting machines.

If you are not sure which blade to order for your machine and material, get in touch through the contact form — we will help you match the diameter, arbor, rim type and bond hardness.

Frequently asked questions about diamond blades for concrete

Why buy a diamond blade for concrete at NORWIT.PL

We focus on a professional cutting range: the offer includes blades from Tyrolit, Cedima, Nozar, Dr. Schulze and Altrad Belle across the full Ø 115–500 mm span — from small grinder discs to large blades for walk-behind floor saws. We advise on matching the rim type and bond hardness to your exact material: plain concrete, reinforced concrete, paving, or cup-wheel grinding. This category is part of the diamond blades section, alongside blades for fresh concrete, for asphalt and for ceramic tiles. We ship online nationwide.