Product Selector: Counterbore


Select your prodocut-group:

Please select your preferred machining method based on the features listed below:

Bilz-counterbore A-HSS

  • Particularly suitable for spotfacing and counterboring of screw head counterbores in tough steel- , aluminium- and copper-alloys up to about 800 N/mm²
  • Three respectively four cutting edges (D>=18) with rake angle 25° respectively 30° offer high stock removal rates at low cutting forces
  • Long tool life due to multiple regrindability
  • Universally usable on many kinds of machine tools with and without rotating pilot

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Bilz-counterbore variation 3-HSS:

  • for hardened tough and brittle materials (Rm > 800 N/mm²)
  • rake angle γ= 18°

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Bilz-counterbore A-HM


  • For hard and tough, brittle and short-chipping materials like grey cast iron, brass and aluminium
  • Three cutting edges with rake angle 8° respectively 12° (D>=9)
  • Fine-grain carbide with high wear resistance
  • Long tool life due to multiple regrindability
  • Universally usable on many kinds of machine tools with and without rotating pilot

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Bilz-counterbore AW

  • Particularly suitable for spotfacing and counterboring of screw head counterbores in all kind of material
  • Three insert seats for carbide-, cermet- and HSS-E-Inserts with different geometries and coatings
  • Round ground guiding chamfers on the inserts (...Z...) prevent chattering, burnish the bore surface and allow close tolerances (IT9-11)
  • Universally usable on many kinds of machine tools with and without rotating pilot

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