Technologist's guide · Tool selection
Straight, turbo or roof-top segmentSegment shape and starting the cut, cooling and debris.
The segment shape affects starting the cut, cooling and debris removal, but it does not decide whether the blade cuts a given material – that is the job of the bond, concentration and grit size. A straight segment is the standard for concrete, reinforced concrete and asphalt blades. A roof-top segment has a pointed edge that enters the material faster and makes the start easier. A grooved (turbo) segment cools better and clears debris in dry cutting – hence turbo blades for angle grinders cutting stone. For porcelain and tiles a continuous rim is usually used – it gives a clean edge without chipping.
The key points in 30 seconds
- Straight: the standard for concrete, reinforced concrete and asphalt – full cross-section, even wear.
- Roof-top: pointed edge – easier start for a new blade; the roof wears off as it works.
- Turbo: grooves cool and clear debris – especially dry, on angle grinders.
- Continuous rim: porcelain and tiles – a clean edge without chipping.
- Shape is an add-on, not the basis: bond, concentration and grit first, then shape.
Segment shapes – comparison
| Shape | What it gives | Typically for | Watch out for |
|---|---|---|---|
| Straight | full cross-section, even wear | concrete, reinforced concrete, asphalt – cut-off saws, saws | a new blade may start more slowly in hard material |
| Roof-top | faster entry into the material, easier start | new blades, hard and smooth material | the advantage disappears once the roof has worn off |
| Grooved (turbo) | better cooling and debris removal | dry cutting, angle grinder blades, stone | edge less smooth than with a continuous rim |
| Sandwich | a profile that helps guide the blade in the cut | longer, deeper cuts | the layers must be matched to the material |
| Continuous rim | clean edge without chipping | porcelain, ceramics, tiles | slower cutting, weaker cooling when dry |
The shape can be ordered in the segment configurator – together with the L × T × H dimensions. Definitions are also in the glossary: turbo segment, roof-top segment, continuous rim.
Straight segment – when is the standard enough?
A straight segment has a flat working surface across its full width. Its whole cross-section works from the first to the last millimetre of height, and wear is even. That is why it is the basic shape for concrete, reinforced concrete and asphalt blades on handheld and walk-behind cut-off saws and on saws. Cooling and debris removal come from the gaps between segments and from water.
If a new blade with straight segments “skates” at the start in hard, smooth material, you usually do not need a different shape – a few cuts in an abrasive material that exposes the diamond are enough. If the problem returns, the cause is often a bond too hard for the material – see the bond in a segment.
Roof-top segment – a faster start
A roof-top segment has a working edge pointed like a roof. At the start it touches the material over a smaller area, so it enters faster – a new blade needs no “breaking in”, and starting a cut in hard, smooth material is easier.
- The advantage is at the beginning. As it works the roof wears off and the segment carries on like a straight one.
- Where it works well: new blades, hard concrete, smooth surfaces, cuts that are often restarted.
- What it will not change: if the bond is too hard for the material, the blade will glaze after the start anyway.
Turbo segment – cooling and debris
A grooved segment, called turbo, has grooves on its surface. The grooves increase the flow of air or water along the segment and help clear debris from the cut. The biggest difference shows in dry cutting – which is why turbo blades are typical for angle grinders with an M14 flange cutting stone.
- Benefits: cooler dry cutting, lower risk of overheating, usually a smoother edge than a segmented blade.
- Limitations: the edge is less clean than with a continuous rim – for porcelain and tiles a continuous rim is better.
- Dry only with a blade designed for it, in short cuts – we cover dust and cutting mode in the article how to choose a cut-off saw blade.
Sandwich segment and continuous rim
- SandwichA segment made of layers with different diamond content. The layers wear unevenly and form a profile that helps guide the blade straight in the cut – useful for longer and deeper cuts.
- Continuous rimAn uninterrupted diamond layer around the circumference, without segments. It gives a clean edge without chipping – the standard for porcelain, ceramics and tiles, usually with fine grit and a very soft bond.
Choosing the segment shape for the job
Choose the tool, material, cutting mode and what matters most to you. We will suggest a shape and an alternative.
Segment shapes – questions and answers
What is the difference between a roof-top and a straight segment?
A roof-top segment has a pointed working edge – it enters the material faster and makes starting the cut easier. As it works, the roof wears off and the segment carries on like a straight one.
What is a turbo segment for?
A turbo (grooved) segment has grooves on its surface that improve cooling and debris removal – especially in dry cutting, e.g. with angle grinder blades for stone.
Turbo or segmented blade?
Turbo – when cooling in dry cutting and a smoother edge in stone matter. Segmented with straight segments – for concrete, reinforced concrete and asphalt on cut-off saws and saws, where blade life matters. For porcelain and tiles – a continuous rim. Find a blade with the blade finder.
Can the segment shape replace choosing the bond?
No. The shape affects starting the cut, cooling and debris, but whether the blade cuts a given material and how fast it wears is decided by the bond, concentration and grit size – explained in the article bond, concentration, grit size.
What is a sandwich segment?
A segment made of layers with different diamond content. The layers wear unevenly and form a profile that helps guide the blade straight in the cut.
Which segment for porcelain and tiles?
Most often a continuous rim – an uninterrupted diamond layer gives a clean edge without chipping. A turbo blade cuts faster, but the edge is less smooth.
On this topic: diamond tool selection
This guide is part of the hub Diamond tool selection. Related articles and tools:
- Bond, concentration, grit size – how to read a segment specification – what really decides cutting.
- How to choose a cut-off saw blade – diameter, bore, speed, cutting mode.
- Asphalt blade vs concrete blade – bond and undercut protection segments.
- Concrete blade for granite aggregate – hard aggregate, soft bond.
- Segment configurator – shape and L × T × H dimensions.