3M Cubitron II Cut and Grind Wheel 125MM X 4.2MM -10/PACK



Grinding Disc

How to Select the Best Grinding Disc

Grinding discs, wheels, and bands use the energy derived from a rapid circular motion to increase its abrasive effect. They are used in various power tools, including bench grinders, angle grinders and even drills. Using the correct tool and grinding disc combination is critical for efficiency and safety.

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A Quick Overview of the Common Abrasives

Grinding discs are made from various abrasive materials bonded into the desired shape. The bonding materials are graded as either soft or hard. Each of these materials has unique properties that make them suitable or unsuitable for a particular job.

  • Aluminium Oxide. This material is commonly used for most types of grinding discs. It is suitable for use on various types and grades of steel, iron, bronze and similar metals.
  • Silicon Carbide. It is harder than standard aluminium oxide and recommended for grinding relatively soft metals such as aluminium, cast iron, brass and soft bronze, as well as stone, rubber and other non-ferrous materials.
  • Diamond. Using diamond abrasives is commonplace in many precision industries, but it is also used on discs for grinding concrete, screed and natural stone. The grit determines whether the surface is left rough or polished to a shine.
  • Ceramic. Ceramic abrasives are those that are made of natural ceramic, which is usually mixed with other abrasive powders such as corundum – quartz and silicon carbide. Ceramic abrasives have a microcrystalline finish and are very uniform in structure, which means they can have many different applications.

Vitrified bonds, made from special clay, are very rigid, strong and porous – forming a hard bonded disc. Synthetic resin bonds create soft discs suitable for use on hard materials. We recommend you pay attention to the material used for bonding the abrasive, since they affect the maximum rotational speed of the disc, its precision and use application.


The Various Types of Grinding Discs

Grinding discs are available in all practical sizes and shapes, with considerable industry standardisation. Apart from the standard grinder discs that are available in various grits for use on most metals, there are also several more specific discs, wheels and bands available:

  • Cut and grind wheel. These discs are similar to the standard ones but are thinner and contain radial fibres for additional strength. They are ideal for edge-cutting steel rods, pipes and even concrete with either an angle grinder or a bench cutter.
  • Bench grinder wheels. These wheels are thicker than the standard grinding discs and are available in various materials, depending on the intended use. One aspect often neglected regarding bench grinder wheels is regular dressing to ensure accurate angles and precise grinding.


  • Concrete grinding wheel. Made from metal fused with millions of industrial diamonds, concrete wheels are used for the levelling and polishing of any concrete or stone surface, thereby producing a lasting, polished look.
  • Spiral band. These look like tiny rolls of sanding paper and are fitted to a special attachment for a drill or similar power tool. Spiral bands are great for creating a polished finish on metals and general woodworking where curves are involved.


The Importance of Choosing the Right Grinding Wheel for the Job

Safety is paramount when using power tools, especially grinders and cutters. The energy output of these tools is phenomenal, and a broken disc can cause serious injuries. Always use a disc or wheel rated for your machine’s rotational speed. Always use the correct size disc and never remove the disc guard to accommodate a larger disc.

We stock the best grinding discs and wheels by trusted manufacturers, so please call or email us if you have any questions regarding the correct cutting or grinding disc for your application and tool.