Korloy MRMN800-M NC3030 8mm Full Radius R4.0 Heavy Duty Steel Profiling Insert (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
The Original Korloy MRMN800-M NC3030 is the ultimate 8.0mm Full Radius (R4.0) Profiling Insert, precision-engineered for the most demanding Heavy-Duty Steel (P) applications. Featuring the high-toughness NC3030 CVD coating, this insert is designed to handle the immense cutting forces of large-scale manufacturing. The massive 8mm wide Round Nose geometry, paired with the specialized -M chipbreaker, allows for aggressive material removal while maintaining superior edge security on carbon steels and heavy alloy forgings.
Maximum Impact Resistance: At 8.0mm wide, the contact area creates significant pressure. NC3030 is Korloy's toughest CVD grade, specifically chosen for this size to prevent brittle fractures during interrupted cuts or when machining parts with hard surface crusts.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | MRMN800-M |
| Insert Shape | Full Radius (Round Nose) |
| Width / Radius | 8.0 mm / R4.0 |
| Grade | NC3030 (Heavy-Duty Steel CVD) |
Core Performance Benefits:
- Unrivaled Metal Removal: 8.0mm width allows for massive lateral feeds and deep profiling in heavy industry applications.
- Extreme Shock Absorption: NC3030 substrate is optimized to resist chipping in heavy interrupted cutting or vibration-prone setups.
- Precision R4.0 Profile: Ideal for large spherical seats, heavy-duty fillets, and rounded grooves in oil, gas, and marine components.
- Enhanced Thermal Shield: Thick CVD coating provides an excellent barrier against the intense heat generated by 8mm wide cuts.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Large Carbon Steel Shafts | 90 - 170 m/min | 0.15 - 0.45 mm/rev |
| Heavy Alloy Steel (4140) | 80 - 140 m/min | 0.12 - 0.35 mm/rev |
| Steel Castings / Rough Cuts | 60 - 100 m/min | 0.10 - 0.25 mm/rev |
Compatible Tool Holders:
Precision 8.0mm seat for heavy-duty holder systems:
- External Holders: MGEHR 3232-8 / 4040-8 / 5050-8
Machinist Tip: Scaling Up to 8.0mm
When using MRMN800, machine rigidity is your #1 priority:
The Reliability Standard. 8mm wide profiling often induces vibration. NC3030 is specifically engineered to "soak up" these vibrations and prevent catastrophic edge failure, ensuring your expensive workpieces are safe.
Always use the shortest possible overhang. For MRMN800, we recommend a minimum shank size of 32mm to ensure the R4.0 radius cuts cleanly without chatter.
Pro Advice: For MRMN800-M NC3030, avoid light feeds. This insert needs a substantial chip load to stabilize the cutting edge. If chatter occurs, try *increasing* the feed rate slightly to push the tool into the material.
Packaging: 10 pieces per box.
Korloy MRMN800-M price, 8mm round nose insert for heavy steel, R4.0 profiling insert for large shafts, NC3030 vs NC3020 for 8mm grooving, MRMN800-M cutting speed and feed
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.