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
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.