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RA: External cylindrical surfaces, from diameter 1 mm


  • Can be used up to tolerance class IT8 
  • For tolerances up to IT11 the special model RAP with pressure controlled expansion is available 
  • Processing of all metallic materials with a tensile strength of 1400 N/mm2 and a maximum hardness of HRC ≤ 45 
  • Attainable surface finish Rz < 1 micron (Ra = 0.1 micron)
  • Machining in pushing motion with clockwise rotation
  • Available with different straight shanks (optional with hollow shank for very long workpieces)
  • Internal coolant-lubricant supply optional
  • Parameter recommendation:
    • Max rotary speed: up to 250 m/min 
    • Max feed: 0.3 mm/rev per roller

3D-View RA11



  • Compact design for application in machines with limited workspace
  • High degree of accuracy
  • Short cycle time
  • Diameter adjustment is easy and reproducible
  • Requires minimal lubrication (oil or emulsion)
  • Tool automatically contracts upon retraction, preventing damage to the roller burnished surface
  • Wear parts are easy to exchange

Basic construction

  • RA tools are supplied with solid cylindrical shafts Morse taper shafts are available as a special design.
  • Roller heads are interchangeable within the diameter range.