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Versatile and cost efficient, this miniature milling cutter benefits from three cutting edges for internal threading and chamfering. Use it in small holes, down to 6 mm (0.236 inch) as a complement to CoroMill 327, CoroMill 328 and CoroMill Plura.



  • Three cutting edges for productivity
  • Chamfering and back-chamfering of holes with one tool
  • Very high precision and low cutting forces
  • Same tool for different pitches
  • One grade for all materials



  • Partial thread profiles for flexibility
  • Small diameter tools, down to 5.8 mm (0.228 inch)
  • Long reach, up to 35 mm (1.378 inch)



  • Internal thread milling
  • Chamfer milling
  • Hole diameters from 6 mm (0.236 inch)
ISO application area


​Chamfering ​Threading


Use with CoroChuck 930 for best stability and precision. Always use with cylindrical collets for CoroChuck 930.
Product Range
Tool diameter mm (inch)
  • Internal thread milling tools: 5.8, 7.8 (0.228, 0.307)
  • Chamfering tools: 5.8, 7.8 (0.228, 0.307)


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