Diamond blades

Here at Hire Station we offer six different sized diamond blades: 

  • 350mm (14inches)
  • 300mm (12inches)
  • 230mm (9inches)
  • 125mm (5inches)
  • 115mm (4.5inches)
  • 100mm (4inches)

100mm diamond blade115mm diamond blade125mm diamond blade230mm diamond blade300mm diamond blade350mm diamond blade

The most common sizes that we supply are the 300 & 230mm (12 & 9inches respectively). Our blades are capable of dealing with most materials including concrete and steel.

We offer general purpose blades such as the P3B but we also stock more specialised blades such as the P4-C (designed for use on concrete), P4A which is a laser welded blade designed for use on asphalt and our P5 5-in-1 that will deal with metal such as cast iron blocks and scaffold poles.

All Diamond blades are constructed from 4 main components:

  • Diamond crystals – these are sometime referred to as ‘Diamond grit’ or, more commonly, Diamonds.
  • A segment
  • The bonding agent – this is also known as a ‘matrix’
  • A steel core

Here we will expand on the four bullet points to identify what each core component is:

Diamond crystals

Also known as Diamond grit, the crystals used in blades are of an industrial standard. 80% of all diamonds mined annually (equal to 27,000kg) are unusable for jewellery application and are so used industrially. Diamonds have a high hardness rating and are the hardest naturally occurring substance on Earth. They also have good thermal conductivity.

Diamond blade construction

Bonding matrix

The bonding agent, sometimes referred to as a bonding matrix, is used to hold the diamond crystals in place. The matrix normally comes in a powder form of metallic origin with most bonding agents being made up via combinations of iron, nickel, bronze, cobalt, tungsten and other various metals.

The matrix is a key component in the structure of the blade as it plays several important roles:

  • It acts as a heat sink – A heat sink is a device (in this case the bonding agent) that helps control the thermal temperature of an object, effectively pulling the heat from the blade out into the cooler air.
  • Disperses and supports the diamonds
  • Prevents diamond pull-outs – the bonding agent helps maintain a firm fixture for the diamond crystals to be placed in.
  • Provides controlled wear whilst also allowing the diamond crystals to protrude outward, maximising their cutting abilities
  • The bonding agent helps distribute the load of impact forces onto the blade as the diamond crystals ‘grind’ the cutting surface

During the cutting process the diamond crystals ‘grind’ away at the material that is being used. This process creates the cutting effect. At the same time this is happening the materials wear down the metallic bonding agent, this exposes new diamond crystals, bringing them to the surface. This in essence ‘refreshes’ the blade and helps expands the parts longevity.

When constructing diamond blades, manufacturers usually produce two different variations of the bonding matrix:

  • The first is when the matrix contains higher levels of softer metals such as nickel, aluminium and copper. These variants of bonding matrix are used in blades that are designed for use on harder, dense materials such as reinforced concrete. These are called ‘soft bond’ blades. The harder materials cause diamond fractures more often, resulting in the need for new diamonds to be exposed at a higher rate.
  • The second is when the matrix is constructed using higher levels of harder metals such as tungsten and cobalt. These variants of the bonding matrix are used in blades that are designed for use soft, sandy or abrasive materials. These are called ‘hard bond’ blades. Softer materials do not damage the diamonds as quickly, meaning the diamond crystals need to be anchored in place for longer periods of time.

Segments

The segments are formed when the Diamond crystals and metallic bonding agent are hot pressed together, some processes use temperatures in excess of 4000 degrees Celsius and use a force of over 7000 PSI. The segments that are produced are wider than the steel core. This is done deliberately to provide a clearance gap during use.

The engineering behind the blade has created a design that is specifically built to wear at a specific rate appropriate to type of work it is being used for. The amount of diamond crystals contained within the blades structure varies depending on the application, an example would be lower powered saws tend to use blades with less crystals for optimum performance. The situation is reversed for higher horse powered saws.

Steel core

The blades are built around a steel alloy core; the base is steel plate not like the wire cores used in diamond wire saws. The core can have a range of designs with some cores having spaces, referred to as ‘gullets’, between the segments of the blade to aid cooling and material removal, these are also beneficial if water is being used during the cutting process. Other designs have a continuous rim for a smoother cut.

To allow the blades to run correctly at cutting speeds most manufacturers tension the blades in house. The correct tension permits the blade to flex slightly under the forces applied during cutting. An arbor hole is then bored into the centre of the core.

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