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Kennametal Mill 4-12KT vs Sandvik CoroMill 390
Mill 4-12KT and CoroMill 390 are 90-degree indexable shoulder mills, but Mill 4-12KT is a tangential four-edge system focused on stability, power efficiency and cuts to 12 mm. CoroMill 390 is a broader light-cutting shoulder platform with several insert sizes, body styles and long-reach options.
Side-by-side comparison
| Category | Kennametal Mill 4-12KT | Sandvik CoroMill 390 |
|---|---|---|
| Insert orientation | Tangentially mounted four-edge inserts with a strong pocket interface and triangular margin. | Conventional positive shoulder inserts in multiple sizes and geometries for light cutting action. |
| Depth of cut | Published axial depth of cut up to 12 mm with multiple corner radii and reinforced heavy-duty geometry. | Maximum depth depends on insert size; the family spans light through heavier shoulder, slot and cavity work. |
| Machine demand | Kennametal publishes up to 15 percent lower horsepower demand, supporting higher feeds on 40-taper machines. | Low cutting forces and vibration-resistant geometries are central advantages, especially with longer reach. |
| Body options | Fine, medium and coarse pitch cutters for steel and cast-iron roughing through finishing. | Cylindrical, arbor, end-mill, long-edge, lightweight and damped configurations with internal coolant on most cutters. |
| Difficult cuts | Reinforced inserts and tangential seating target heavy and severely interrupted cuts. | Broad geometry and body selection makes CoroMill 390 adaptable to mixed shoulder, slot, side and cavity operations. |
Best fit by application
Kennametal Mill 4-12KT
- Use Mill 4-12KT for tangential insert strength, four-edge economics and demanding steel or cast-iron shoulder cuts up to its published depth.
- It is compelling when spindle horsepower is constrained but a stable heavier cut is required.
Sandvik CoroMill 390
- Use CoroMill 390 when light cutting forces, long reach, cavity access or broad body/insert flexibility matter more than tangential four-edge architecture.
- Its damped and lightweight body options expand the practical overhang range.
Selection notes
Mill 4-12KT is the more specialized tangential heavy-shoulder system. CoroMill 390 is the broader light-cutting shoulder platform. Choose based on cut severity, available power, overhang and operation mix.
Variables to validate
- Compare equivalent cutter diameter, pitch, corner radius, axial depth and radial engagement.
- Insert edge count alone does not predict wall accuracy, power, vibration or cost per part.