Superfinishing Stones for Bearing Rings

The better quality of the races

Product / User Benefits

  • A/O vitrified bonded: better material removal, good surface quality with fine grit size
  • SIC vitrified bonded: better surface quality
  • CBN vitrified bonded: long stone life, for small rings or special steel materials
  • Special products: with paraffin- or sulphur impregnation for higher material removal rates, mixtures of A/o and SIC 

Fields of Applications

Superfinishing of inner- and outer rings

General Information

The superfinishing is the final operation for bearing races. All qualities like roundness, wave, form and surface finish have to meet low tolerances.


  • Superfinishing machines: the rings are usually supported and driven by steel rolls. It can be done with one or more stations and steps (roughing and finishing). The stone oscillates across the race.

Grinding Tools:

  • Superfinishing stone type 54SCH (special design: with profile to match the race; stone block type 54SCHP to be cut to size)

Outer ring
ball track

Inner ring
ball track

Outer ring taper
roller track


For further details and shape drawings see: Your Partner in the Bearing Industry.


  • Your Partner in the Bearing Industry