PHT Plateau Honing Tools 

  • Diameter for DH Tools: 69.9 mm - 131 mm (2.750 in - 5.555 in)
  • Diamter for Portable Tools: 54.6 mm - 245.9 mm (2.15 in - 9.68 in)
  • Diameter for CV/CK Tools: 50. 8 mm - 142.4 mm (2 in - 6 in)
  • The only way to obtain a true plateau is to apply even pressure while honing.
  • Honing with PHT tools is so easy, even a new operator can turn out plateau finishes with minimal training. 
  • Sunnen’s specially developed PHT Plateau Honing Abrasives cover the complete line of Sunnen DH/CV/CK tools as well as portable honing tools.

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Plateau honing is a special process which has generated interest in the engine manufacturing and rebuilding market ... and for good reason.
Typical honing leaves a series of microscopic peaks and valleys in a cylinder. The valleys created during honing act as oil reservoirs to provide lubrication when the engine is running. The peaks, on the other hand, are worn off by the piston rings as the engine is broken in – thus leaving a plateaued surface above the valleys.

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