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CoroMill 170 Rough gear milling with precision

CoroMill® 170 is a high performance cutter for large gears in module range 12-22. In combination with our latest grades, CoroMill 170 will cut time in your gear machining, leaving minimal and even allowance for subsequent operations. Use it for precision and reliability in roughing external and internal gears.



  • Productivity of high performance grades
  • Roughing profile close to final gear wheel profile
  • Clean root cut, no deviations



  • Gear wheel profiles in accordance with DIN 867 and allowance in accordance with DIN 3972-4
  • High-precision cutter body and insert tip seats 
  • Secure insert fixturing
  • Selected high performance insert grades for ISO P
  • Tailored to specific gear profiles



  • Module range 12 – 22
  • Roughing of internal and external gears
  • Slewing rings
  • Planetary gears
ISO application area
For larger modules or components with smaller diameters, for example pinions, we have engineered roughing to semi-finishing tools. Contact your Sandvik Coromant representative to order.

Product range

The standard assortment covers:

  • Grades GC1030 and GC4240
  • 6 root inserts
  • 1 flank insert
  • 1 shim


  • Assortment for module range 12–22
Engineered products are available for more:
  • Diameters
  • Insert sizes and grades
  • Gear profiles
  • Modules
Root inserts  
  • Six root inserts for modules 12-22 (one per even module)
  • -L, -M and -H geometries
  • GC1030 and GC4240 grades

-L (light)​

-M (medium)​

-H (heavy machining)​
Flank inserts  
  • One flank insert for modules 12-22
  • -L, -M and -H geometries
  • GC1030 and GC4240 grades

-L (light)​

-M (medium)​

-H (heavy machining)​
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