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CoroMill® 390


Select the right insert geometry

Light (-L)
- Extra positive
- For light machining
- Low cutting forces
- Low feed rates

Medium (-M)
- First Choice geometry
- Medium feed rates
- Medium operations to light roughing

Heavy (-H)
- Reinforced cutting edge
- Heavy machining
- Highest edge security
- High feed rates

Select the right tool holding

​Tool mounting has the greatest influence on the milling result. The larger the cutting depth, the more important the size and stability of the coupling become since the radial forces are considerable when using shoulder face mills, particularly long edge milling cutters.

Use Coromant Capto® couplings that provide optimum stability and the smallest deflection for all types of cutters – particularly important with long or extended tooling.

Insert screw

​In small indexable cutters, the screw is the most sensitive and critical part for a secure and productive process. Always ensure correct mounting of the insert screw.

Eliminate vibration with Silent Tools™

CoroMill® 390 is now available with Silent Tools vibration damping technology for insert sizes 07 and 11.

Download handling instructions here.

Application tips

Application checklist and hints

What should you consider when performing a shoulder milling operation? Find useful tips and tricks here.

How to choose the right pitch

When choosing the most suitable number of effective cutting edges, zc, for the operation, it is essential to consider the pitch (distance between the cutting edges).

Cutter position

Each time a milling edge enters a cut, it is subjected to a shock load. The right type of contact between edge and material at the entry and also at the exit of a cut must be considered for successful milling.​


First choice geometry and grade

  • M-PM, M-KM, M-MM

    • First choice for most applications

  • E-MM

    • Optimized geometry for ISO M

  • E-PL, E-KL, E-ML, E-NL

    • Sharp and positive geometries used as problem solvers for applications which are sensitive in terms of cutting force or vibration, or when there is a need for high surface quality or high cutter accuracy

P -PM GC1130
M -MM GC1040
K -KM GC1020
N -NL H13A
S -PM S30T
H -PM GC1010

Cutters for dedicated applications

  • Oversized cutters enhance the accessibility and provide natural clearance to tight fixtures

  • Cutters with integrated Coromant Capto® coupling and adaptors provide the optimal rigidity for use on extended tool assemblies

  • Silent Tools™ vibration damping for increased metal removal and improved surface finish, when using slender tools

  • Turn milling, roughing and finishing, using one or more dedicated wiper inserts available in size 11 and 18 and radius 0.8 mm and 1.6 mm

  • Cutters with size 07 inserts in dimensions specifically designed for key slots with a tool diameter 0.3 mm (0.012 inch) smaller than the slot width

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