Korloy FMM400R-04 NC3020 4mm Single-Ended Multi-Functional Insert for Steel (10pcs)
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The Original Korloy FMM400R-04 NC3020 is a premium Single-Ended Multi-Functional Insert designed for high-efficiency Grooving, Side-Turning, and Parting. This 4.0mm width insert is the "Speed Specialist" of the FMM series. By utilizing the NC3020 CVD coating, it offers exceptional crater wear resistance and thermal stability, allowing for significantly higher cutting speeds compared to general-purpose grades. Its single-ended architecture provides the rigidity needed to maintain tight tolerances during 4mm wide axial turning and deep radial plunging.
High-Speed Advantage: NC3020 is engineered for stability. If your CNC setup is rigid and your workpiece is standard carbon or alloy steel, this grade will allow you to push the RPM higher, reducing overall cycle time while delivering a superior surface finish.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | FMM400R-04 |
| Design | Single-Ended (Maximum Rigidity) |
| Width (w) | 4.0 mm |
| Grade | NC3020 (High-Wear Resistance CVD) |
Core Performance Benefits:
- Engineered for High Vc: NC3020 grade allows for faster spindle speeds without sacrificing edge integrity.
- Single-Ended Seating: The long-body design ensures the insert stays perfectly aligned under high-speed centrifugal forces and lateral loads.
- 3-in-1 Tooling: Capable of plunging, side-turning, and parting-off—ideal for reducing tool change downtime.
- Superior Wear Resistance: Advanced Al2O3 CVD coating technology protects the edge against high-temperature friction in continuous steel cuts.
Recommended Cutting Parameters:
| Operation | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Radial Grooving | 120 - 220 m/min | 0.08 - 0.20 mm/rev |
| Side-Turning (Axial) | 140 - 250 m/min | 0.15 - 0.35 mm/rev |
| Parting-off | 100 - 180 m/min | 0.06 - 0.16 mm/rev |
Compatible Tool Holders:
To maintain high-speed stability, use with genuine FMMR series holders:
- Multi-Functional Holders: FMMR 2525-4 / FMMR 3232-4
Machinist Strategy: NC3020 vs. NC3030
Selecting the right 4.0mm FMM grade based on your workpiece condition:
The Efficiency King. Best for continuous, stable cutting at high speeds. It offers better wear resistance but is more brittle than NC3030.
The Toughness Guard. Choose this for interrupted cuts, heavy scale, or unstable machines where the tool might experience shock.
Machinist's Pro Tip: When using the FMM400R NC3020 for side-turning, ensure you use a rich coolant flow. Because NC3020 runs at higher speeds, cooling the cutting zone is critical to prevent the chips from re-welding to the workpiece surface.
Packaging: 10 pieces per box.
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