Korloy MGGN300-02-M CN20 3mm Double-Ended Cermet Grooving Insert for Finishing (10pcs)
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The Original Korloy MGGN300-02-M CN20 is a high-precision Double-Ended Multi-Functional Insert designed for Grooving, Profiling, and Finishing operations. Featuring the CN20 Cermet grade, this insert is the ultimate choice for machinists requiring a mirror-like surface finish and tight dimensional tolerances in Steel (P) and Cast Iron (K). The double-ended design maximizes cost-efficiency by providing two sharp cutting edges per insert, while the -M chipbreaker ensures stable chip control during both radial plunging and axial turning.
The Cermet Advantage: Unlike carbide, the CN20 cermet grade has a low chemical affinity with steel, which drastically reduces "Built-up Edge" (BUE). This results in exceptional surface integrity and longer tool life during high-speed finishing cycles.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | MGGN300-02-M |
| Material | CN20 (Uncoated Cermet) |
| Width (w) | 3.0 mm |
| Corner Radius | 0.2 mm |
Core Performance Benefits:
- Mirror-Finish Results: Cermet's high wear resistance and sharp edge retention make it perfect for finishing passes where surface quality is critical.
- Double-Ended Economy: Two usable edges per insert significantly lower your cost-per-part compared to single-ended alternatives.
- Excellent Thermal Resistance: CN20 maintains its hardness at high temperatures, allowing for stable high-speed machining without coolant if necessary.
- Stable Profiling: The M-type chipbreaker is optimized for multi-directional cutting, preventing chip entanglement during side-turning moves.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Low Carbon Steel | 150 - 300 m/min | 0.05 - 0.15 mm/rev |
| Alloy Steel | 120 - 250 m/min | 0.05 - 0.12 mm/rev |
| Grey Cast Iron | 100 - 220 m/min | 0.08 - 0.18 mm/rev |
Compatible Tool Holders:
MGGN inserts fit standard MGEHR/L type external grooving holders:
- External Holders: MGEHR 2020-3 / MGEHR 2525-3
Cermet Tip: CN20 vs. NC3030 (Carbide)
When to choose Cermet (CN20) over traditional Carbide?
Best for Finishing. Choose this for high-speed, stable cuts where you need a beautiful surface finish. Not recommended for heavy interrupted cuts or roughing.
Best for Roughing & Toughness. Choose this for interrupted cuts, heavy loads, and low-to-medium speeds in steel.
Machinist's Pro Tip: Cermet is more brittle than carbide. Avoid using MGGN300 CN20 on workpieces with heavy scale or significant interruptions. For best results, use it as a dedicated finishing tool after a roughing pass with a carbide insert.
Packaging: 10 pieces per box.
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