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GMI: Cylindrical bores, diameters 3.70 mm to 21.00 mm

Through hole; diameters 3.70 – 6.00 mm
Blind hole; diameters 6.00 – 21.00 mm


  • Can be used up to tolerance class IT8
  • Suitable for all metal materials up to a tensile strength of 1400 N/mm2 and a maximum hardness of HRC ≤ 45
  • Can achieve a surface quality of Rz < 1 μm (Ra ≤ 0.1 μm)
  • Application ideal for sliding headstock lathes, but also on CNC controlled turning, drilling or milling machines, machining centers or conventional machine tools 
  • Machining in pushing motion with clockwise rotation
  • Available with straight shank
  • Parameter recommendation:
    • ​​​​​​​Max rotary speed: up to 250 m/min
    • Feed: 0.05–0.3 mm/rev per roller


  • Compact design for applications in machines with limited workspace
  • Short cycle time
  • Diameter adjustment is easy and repeatable
  • 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