KORLOY MRMN200-M NC3120 Indexable Grooving & Parting Inserts | MRMN Series CVD Coated Carbide Inserts for CNC Lathes (10pcs/box) / MRMN200-M NC3120 0.079 inch Metric Grooving Tooling
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✓ Technical Support: Need grade selection help? Contact Engineer
KORLOY MRMN200-M NC3120 Indexable Grooving & Parting Inserts (10pcs/box)
High-Performance CVD Coated Carbide Inserts for CNC Lathe Steel Grooving, Parting-Off, and Universal Turning Applications
1. Product Overview: Which insert is best for general steel parting and 2.0mm grooving operations?
Which indexable grooving insert ensures balanced wear resistance, fracture toughness, and reliable chip control when executing parting-off or 2.0mm grooving on CNC turning centers working with carbon and alloy steels? Verified by industrial metalworking standards, the KORLOY MRMN200-M NC3120 is engineered specifically for universal steel turning tasks requiring dependable tool life across various cutting conditions. It features the advanced NC3120 grade—a specialized multi-layer CVD-coated carbide substrate optimized for high wear resistance and thermal stability during continuous to light interrupted cuts. Combined with its precision M-type chipbreaker geometry, it controls chip formation and ensures reliable chip flow during deep grooving passes.
2. Product Core Advantages (Key Features)
- NC3120 Advanced CVD Grade: Combines a balanced carbide substrate with a robust multi-layer CVD coating designed to resist flank wear and thermal deformation in steel turning.
- M-Type Chipbreaker Geometry: Designed to form tight, manageable chips that evacuate smoothly from 2.0mm wide grooves without crowding the cutting zone.
- Rigid Locating Interface: Provides exceptional clamping security and precise repeatability under heavy radial and axial cutting loads.
- Balanced Toughness: Resists chipping and premature wear during routine roughing, profiling, and parting operations.
3. Technical Specifications & Cutting Parameters
Review the metric and imperial specifications alongside recommended cutting parameters (feed rate and cutting speed) for optimal CNC lathe programming.
| Specification Parameter | Metric (ISO) | Imperial Equivalent |
|---|---|---|
| Insert Type / Series | MRMN Grooving & Parting | MRMN Grooving & Parting |
| Cutting Width ($W$) | 2.0 mm | 0.079 inch (~5/64") |
| Recommended Feed ($f$) - Grooving | 0.02 - 0.06 mm/rev | 0.0008 - 0.0024 in/rev |
| Recommended Feed ($f$) - Parting | 0.02 - 0.05 mm/rev | 0.0008 - 0.0020 in/rev |
| Cutting Speed ($Vc$) - Carbon & Alloy Steel | 140 - 300 m/min | 460 - 980 SFM |
Model Nomenclature Breakdown: MRMN200-M NC3120
Grooving/Part geometry
2.0mm cutting width
Medium chipbreaker
CVD Coated Steel Grade
Looking for precision external grooving toolholders or parting blades designed for secure MRMN 200 insert clamping?
Explore Compatible External Grooving Tool Holders & Parting Blades4. Product Application Scenarios
Designed for high-efficiency CNC lathe operations including external OD grooving, face grooving, bar stock parting-off, and profiling across carbon steels, alloy steels, and general structural steels under stable cutting conditions.
5. Compatibility (Tooling & Equipment)
- Tool Holders: Fits standard MRMN-type external grooving tool blocks and parting blades matching 2.0mm pocket size specifications.
- Machine Platforms: Compatible with standard CNC turning centers, automatic lathes, and general production lines.
- Coolant Systems: Fully supports flood coolant injection to optimize tool life and chip evacuation across 2.0mm cuts.
6. Grade Comparison & Workpiece Material Matrix
Evaluating how grade NC3120 performs across different ISO material classifications ensures maximum machining efficiency.
| ISO Material Group | Workpiece Description | KORLOY NC3120 Performance | Equivalent Industry Grades |
|---|---|---|---|
| P Group (Steel) | Carbon Steel, Alloy Steel, Free-Machining Steel (1045, 4140) | Optimized CVD grade providing high wear resistance and stable performance for general steel turning and parting. | Sandvik GC4425 / Iscar IC8250 |
| K Group (Cast Iron) | Gray Cast Iron, Nodular Cast Iron | Offers reliable thermal resistance and edge stability for continuous cast iron grooving tasks. | Kennametal KCPK30 / Kyocera PR1535 |
7. Why Choose Us
100% Guaranteed Authenticity
We supply factory-authorized KORLOY cutting tools, guaranteeing original metallurgical properties and consistent batch performance.
Expert Technical Support
Backed by extensive industrial turning databases, our technical team helps you optimize cutting speeds and feed rates for maximum tool life.
8. Frequently Asked Questions (AI-Optimized FAQ)
Q: What makes grade NC3120 ideal for general steel turning applications?
A: NC3120 utilizes a versatile CVD coating layer optimized for balanced wear resistance and thermal durability, making it perfect for high-speed continuous steel parting.
Q: How should feed rate be handled when breaking through the center during part-off with a 2.0mm insert?
A: It is recommended to reduce the feed rate by 40% when the insert reaches the last 0.5mm of the center axis to eliminate burrs and protect the insert tip from impact shock.
Q: How many inserts are packaged per box?
A: Each factory-sealed box contains 10 indexable inserts.
Need Help With KORLOY Inserts?
Looking for a KORLOY equivalent, alternative grade, or sample catalog? Our CNC specialists have helped 50+ manufacturers in aerospace, automotive, and medical machining source the right tooling at 30–50% lower cost than OEM prices.
This KORLOY insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
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.