Super Abrasives (Diamond & CBN Hones)

diamond and CBN  honing sticks

Diamond Hones

Diamond honing stones in metallic and resinoid bond have been used successfully for many years. These hones can be subjected to higher working pressures and surface speeds than conventional abrasives.

The main field of application has been honing tungsten carbide and ceramics where, because of the material hardness, conventional vitrified abrasives are unsuccessful. In certain other areas the use of diamond hones can result in a reduction in honing costs. Examples of applications in these areas are:

  • Cast Iron
  • Hardened steels above HRC 63
  • Components having interrupted bores

Three types of bonding materials are used to determine the hardness of the diamond hone.

Cobalt Iron Bond (M)

A hard bond used for tungsten carbide with cobolt content above 25%. Also used for cast iron, glass, ceramic etc..

Bronze Bond (MB)

A medium bond used for tungsten carbide with cobalt content 11% - 25% and also used on most heat treated steels above HRC63.

Resinoid Bond (S4)

A soft bond used for tungsten carbide with a cobalt content of >11% and also used for other extremely hard materials.


CBN Hones

Two types of bonding materials are used to determine the hardness of the CBN hone. The harder stone should be used for interrupted bores, short bores or when the pre hone finish is poor.

Resinoid Bond (BR)

A soft bond used for tough hardened steels including titanium up to HRC63. Also suited to sintered materials such as Alnico and special alloys like Inconel.

Generally used at higher speeds and lower pressure than diamonds or standard abrasives. Always use the lowest pressure that will give a good cutting action. Increasing the pressure beyond this point ill result in increased stone wear with very little increase in stock removal.

Bronze Bond (BB)

A medium bond used for components having interrupted bores (cross holes, annular grooves, etc) or when the surface finish prior to honing is very poor.

Because the bonding material is harder, it can be used at higher pressures than the resinoid stone and can therefore be used if satisfactory results cannot be achieved with the "BR" bond.


Delapena Sintered Products now manufacture a wide range of super abrasives in house at our Cheltenham manufacturing centre. Contact us for more information.


You can now have our Sunnen Compatible super abrasive grades on Delapena stone holders for Delapena mandrels. See more information