KORLOY MRMN500-M NC3120 Indexable Grooving & Parting Inserts | MRMN Series CVD Coated Carbide Inserts for CNC Lathes (10pcs/box) / MRMN500-M NC3120 0.197 inch Metric Grooving Tooling
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KORLOY MRMN500-M NC3120 Indexable Grooving & Parting Inserts (10pcs/box)
High-Performance CVD Coated Carbide Inserts for CNC Lathe Steel Grooving, Parting-Off, and Heavy-Duty Turning Applications
1. Product Overview: Which insert is best for versatile steel parting and 5.0mm grooving applications?
Which indexable grooving insert ensures superior balance of wear resistance, thermal stability, and prolonged tool life when executing parting-off or 5.0mm grooving on CNC turning centers? Verified by industrial metalworking standards, the KORLOY MRMN500-M NC3120 is engineered specifically for versatile steel machining tasks. It features the advanced NC3120 grade—a specialized multi-layer CVD-coated carbide substrate optimized for high fracture toughness, crater wear resistance, and edge reliability under continuous and moderately interrupted cutting conditions across carbon steels, alloy steels, and structural steels. Combined with its precision M-type chipbreaker geometry, it controls chip formation and ensures stable, 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 withstand moderate cutting speeds and thermal loads in general steel turning.
- M-Type Chipbreaker Geometry: Designed to form tight, manageable chips that evacuate smoothly from 5.0mm wide grooves without crowding the cutting zone.
- Rigid Locating Interface: Provides exceptional clamping security and precise repeatability under radial and axial cutting loads.
- High Flank Wear Resistance: Resists abrasive wear and edge chipping during general 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 ($W$) | 5.0 mm | 0.197 inch (~13/64") |
| Recommended Feed ($f$) - Grooving | 0.06 - 0.14 mm/rev | 0.0024 - 0.0055 in/rev |
| Recommended Feed ($f$) - Parting | 0.03 - 0.09 mm/rev | 0.0012 - 0.0035 in/rev |
| Cutting Speed ($Vc$) - Carbon & Alloy Steel | 110 - 250 m/min | 360 - 820 SFM |
Model Nomenclature Breakdown: MRMN500-M NC3120
Grooving/Part geometry
5.0mm cutting width
Medium chipbreaker
CVD Coated Grade
Compatible Tooling Link:
View Compatible External and Internal Lathe Grooving Tool Holders for MRMN Inserts4. Product Application Scenarios
Designed for high-speed CNC lathe operations including external OD grooving, face grooving, standard bar stock parting-off, and profiling across carbon steels, alloy steels, and general structural metals.
5. Compatibility (Tooling & Equipment)
- Tool Holders: Fits standard MRMN-type external grooving tool blocks and parting blades matching 5mm pocket size specifications.
- Machine Platforms: Compatible with heavy-duty CNC turning centers, multi-axis lathes, and automatic bar machines.
- Coolant Systems: Fully supports flood coolant injection to enhance thermal regulation and chip evacuation across 5mm 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 (C45, 4140, 1045) | Delivers reliable general-purpose wear resistance and thermal toughness during continuous or light intermittent steel parting. | Sandvik GC4325 / Iscar IC908 |
| K Group (Cast Iron) | Gray Cast Iron, Nodular Cast Iron | Substrate composition provides adequate resistance against abrasive wear in stable cast iron grooving. | Kennametal KCP25 / Kyocera PR1225 |
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 are the main characteristics of the NC3120 CVD grade for carbon and alloy steel turning?
A: NC3120 is designed as a versatile CVD grade offering a balanced combination of coating adhesion and thermal resistance, making it ideal for general-purpose grooving and parting-off applications.
Q: How should feed rate be handled when breaking through the center during part-off with a 5mm insert?
A: It is recommended to reduce the feed rate by 40% when the insert reaches the last 1.0mm 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.