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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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
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.