Can You Cut Reinforced Concrete with an Angle Grinder?

What You Need To Know Before You Start

Simple answer…. yes, you can cut reinforced concrete with an angle grinder.

However…… should you?

Will it perform effectively?

For a complete overview of tools, blades and material considerations, see our Concrete Cutting Guide.

These depend on:

  • Blade size
  • Material depth
  • Reinforcement density
  • Blade quality

In some situations, a petrol saw may be more appropriate for reinforced sections due to greater cutting depth and stability. If you’re unsure which setup suits your job, see our comparison of angle grinder vs petrol saw for concrete cutting before committing to a method.

The Short Answer

Angle grinder cutting concrete

An angle grinder fitted with a 230mm diamond blade can typically cut to around 60-65mm depth.

That’s suitable for:

  • Shallow reinforced slabs
  • Concrete lintels
  • Brickwork containing light reinforcement
  • Repair and remedial work

For deeper structural sections, a petrol saw may be more appropriate. 

What Happens When You Hit Rebar?

When the blade meets reinforcement:

  • Friction increases
  • Heat rises quickly
  • Cutting speed drops
  • Segment wear accelerates

Lower-quality blades often struggle at this point.

They may:

  • Spark excessively
  • Lose cutting speed
  • Glaze after repeated contact with steel

Cutting reinforced concrete requires a blade capable of handling both aggregate and steel without losing performance. Before selecting a disc, read how to choose the right concrete cutting disc to understand bond selection and density considerations.

The Real Limiting Factor: Blade Quality

The grinder provides power.

The blade determines performance.

When cutting reinforced concrete with an angle grinder, you need a blade that:

  • Maintains cutting speed under load
  • Resists glazing
  • Handles repeated steel contact
  • Manages heat effectively

If reinforced cutting forms a regular part of your work, using a blade designed for demanding structural materials improves consistency and reduces glazing. The Pathfinder concrete cutting disc is engineered to maintain cutting speed in dense and reinforced construction applications.

Depth Considerations

A 230mm blade gives a maximum cutting depth of around 60-65mm.

If reinforcement sits deeper than that, you may need:

  • Stepped cutting
  • Cutting from both sides
  • A larger machine

For full depth guidance by blade size, see our concrete cutting depth guide.

When an Angle Grinder is Suitable

Use an angle grinder if:

  • The slab is under 65mm thick
  • Reinforcement is light or intermittent
  • Access is restricted
  • You are making controlled,  shorter cuts

When a Petrol Saw is Better

Consider a petrol saw if:

  • The slab exceeds 65mm depth
  • The reinforcement is heavy
  • You need continuous cutting over longer runs
  • Productivity is critical

If you are unsure how to match the blade to reinforced material, read our guide on choosing the right diamond blade.

Final Thoughts

Yes – an angle grinder can cut reinforced concrete.

But success depends on:

  • Depth
  • Reinforcement
  • Cutting method
  • Blade quality

Choosing the right blade from the start reduces glazing, improves speed and safety, and protects your machine.

Explore our full range of professional diamond blades to match your application.

We’re hanging out on TikTok, join us.