KORLOY MRMN250-M NC3030 Indexable Grooving & Parting Inserts | MRMN Series CVD Coated Carbide Inserts for CNC Lathes (10pcs/box) / MRMN250-M NC3030 0.098 inch Metric Grooving Tooling
Free shipping on all orders.
Check compatibility: Confirm the model and dimensions before ordering.
Need help choosing? Contact us before ordering.
💰 Bulk savings 2-9 pcs · 6% OFF | 10+ pcs · 12% OFF
KORLOY MRMN250-M NC3030 Indexable Grooving & Parting Inserts (10pcs/box)
High-Performance CVD Coated Carbide Inserts for CNC Lathe Steel Grooving, Parting-Off, and Interrupted Cut Applications
1. Product Overview: Which insert is best for heavy-duty steel parting and 2.5mm grooving under interrupted cuts?
Which indexable grooving insert ensures superior impact toughness, thermal shock resistance, and reliable chip control when executing parting-off or 2.5mm grooving on CNC turning centers working under unstable or interrupted cutting conditions? Verified by industrial metalworking standards, the KORLOY MRMN250-M NC3030 is engineered specifically for carbon steel, alloy steel, and cast iron machining tasks requiring enhanced edge toughness. It features the advanced NC3030 grade—a specialized multi-layer CVD-coated carbide substrate optimized for high fracture resistance and thermal stability under heavy feed and intermittent loads. 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)
- NC3030 Advanced CVD Grade: Combines a high-toughness carbide substrate with a robust multi-layer CVD coating designed to withstand thermal shock and mechanical impact in interrupted steel turning.
- M-Type Chipbreaker Geometry: Designed to form tight, manageable chips that evacuate smoothly from 2.5mm wide grooves without crowding the cutting zone.
- Rigid Locating Interface: Provides exceptional clamping security and precise repeatability under heavy radial and axial cutting loads.
- High Fracture Toughness: Resists chipping and catastrophic edge failure during roughing, profiling, and deep 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 ($W$) | 2.5 mm | 0.098 inch (~3/32") |
| Recommended Feed ($f$) - Grooving | 0.03 - 0.08 mm/rev | 0.0012 - 0.0031 in/rev |
| Recommended Feed ($f$) - Parting | 0.02 - 0.06 mm/rev | 0.0008 - 0.0024 in/rev |
| Cutting Speed ($Vc$) - Carbon & Alloy Steel | 120 - 280 m/min | 390 - 920 SFM |
Model Nomenclature Breakdown: MRMN250-M NC3030
Grooving/Part geometry
2.5mm cutting width
Medium chipbreaker
CVD Coated Tough Grade
Looking for precision external grooving toolholders or parting blades designed for secure MRMN 250 insert clamping?
Explore Compatible External Grooving Tool Holders & Parting Blades4. Product Application Scenarios
Designed for high-toughness CNC lathe operations including external OD grooving, face grooving, bar stock parting-off, and profiling across carbon steels, alloy steels, and forged components subject to intermittent cutting forces.
5. Compatibility (Tooling & Equipment)
- Tool Holders: Fits standard MRMN-type external grooving tool blocks and parting blades matching 2.5mm 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 2.5mm cuts.
6. Grade Comparison & Workpiece Material Matrix
Evaluating how grade NC3030 performs across different ISO material classifications ensures maximum machining reliability.
| ISO Material Group | Workpiece Description | KORLOY NC3030 Performance | Equivalent Industry Grades |
|---|---|---|---|
| P Group (Steel) | Carbon Steel, Alloy Steel, Forged Steel (4140, 4340) | High-toughness CVD grade optimized for interrupted cuts, roughing, and heavy parting operations with superior fracture resistance. | Sandvik GC4325 / Iscar IC808 |
| K Group (Cast Iron) | Gray Cast Iron, Ductile Iron | Provides exceptional edge strength under thermal and mechanical shocks typical of cast iron rough turning. | Kennametal KCPK20 / 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: Why choose grade NC3030 over NC3020 for steel grooving?
A: NC3030 features a tougher carbide substrate and coating combination specifically tailored for interrupted cuts, heavy scale, and unstable workpiece conditions where edge chipping is a risk.
Q: How should feed rate be handled when breaking through the center during part-off with a 2.5mm insert?
A: It is recommended to reduce the feed rate by 40% when the insert reaches the last 0.6mm 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.