Korloy FMM400R-04 NC3020 4mm Single-Ended Multi-Functional Insert for Steel (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
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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Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.