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CoroDrill 861 Solid carbide deep hole drills

​CoroDrill® 861 provides the high stability essential for drilling deep holes, with high speed and efficiency.



  • Accurate deep holes to depths up to 30 × drill diameter, without pecking
  • High speeds and feeds allow greater productivity to reduce cost per hole
  • Fast and efficient chip evacuation reduces machine downtime and increases tool life



  • ACM (Advanced Chip Management) flute geometry encourages small and manageable chips
  • Specially designed point geometry helps to reduce thrust forces
  • Consistent edge preparation protects the cutting edge from premature chipping and flaking
  • Double offset margin patented geometry offers greater stability to the drilling operation
  • Internal coolant holes deliver coolant directly to the tip of the drill even at deep drilling depths


  • Achievable hole tolerance H8−H9
  • Clamp with high precision chucks only
  • Drill lengths: 12−30 × drill diameter
  • A wide range of workpiece materials
  • Conventional drilling, cross holes, angled faces
  • Automotive: crankshafts, engine blocks, cylinder heads
ISO application area


Product range

Length/diameter ratio​ Diameter, mm
Coolant Geometry Shank style ​ Grade
 12 ​ 3−14
Internal​ -GM​ Cylindrical​ GC34​
15​ 3−12
Internal​ -GM​ Cylindrical​ GC34​
20​ 3−12
Internal​ -GM​ Cylindrical​ GC34​
30​ 3−8
Internal​ -GM​ Cylindrical​ GC34​
Pilot drill ​ 3−12
Internal​ -GP​ Cylindrical​ GC34​


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