Korloy MGMN400-M NC3030 4mm Double-Ended Tough Steel Grooving Insert (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
The Original Korloy MGMN400-M NC3030 is a heavy-duty 4.0mm Double-Ended Grooving Insert engineered for High-Impact Steel Machining. When dealing with large-diameter solid bars or workpieces with interrupted surfaces (like splines or cross-drilled holes), tool pressure and shock can easily shatter standard inserts. The NC3030 CVD grade is specifically reinforced to absorb these mechanical shocks, providing a stable and reliable cutting edge for carbon steels and alloy steels in the toughest workshop environments.
Heavy-Duty Reliability: The 4.0mm width offers the highest lateral and vertical rigidity in the MGMN range. Combined with the NC3030 grade, it is the ultimate "safety-first" choice for large-scale production where downtime due to tool breakage must be avoided.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | MGMN400-M |
| Insert Width (w) | 4.0 mm |
| Grade | NC3030 (Heavy-Duty CVD for Steel) |
| Chipbreaker | -M (Stable Medium-Cutting) |
Core Performance Benefits:
- Maximum Shock Absorption: Optimized carbide substrate prevents catastrophic tool failure during heavy interrupted cuts.
- Enhanced Rigidity: The 4mm wide body prevents tool "snapping" during deep radial plunging in large workpieces.
- Thick CVD Coating: Acts as a heat shield, extending tool life during long, continuous parting operations on solid bars.
- Double-Ended ROI: Two usable cutting edges provide superior cost-per-part value for industrial machining.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Low Carbon Steel (1020/1045) | 110 - 210 m/min | 0.10 - 0.25 mm/rev |
| Alloy Steel (4140/5140) | 80 - 160 m/min | 0.08 - 0.20 mm/rev |
| Steel Castings / Forgings | 60 - 130 m/min | 0.10 - 0.18 mm/rev |
Compatible Tool Holders:
Must be used with heavy-duty 4.0mm MGEHR/L external holders:
- External Holders: MGEHR 2020-4 / 2525-4 / 3232-4
The Toughness Comparison: NC3030 vs. NC3120
For 4.0mm heavy grooving, your priority should dictate your grade choice:
The Tough Tank. Best for interrupted cuts, heavy shocks, and vibrating setups. It's the "insurance policy" against broken inserts.
The Productivity King. Best for stable CNC operations and higher speeds. Offers more wear resistance but might chip under heavy impact.
Machinist's Pro Tip: With a 4.0mm insert like the MGMN400-M NC3030, the center height of your tool is critical. Even with a tough grade, being $0.1mm$ below center can cause massive pressure build-up and tool seat damage during parting-off.
Packaging: 10 pieces per box.
Korloy MGMN400-M NC3030 price, 4mm steel parting insert for heavy duty CNC, MGMN400-M speed and feed for alloy steel, NC3030 grade for interrupted grooving, tough 4.0mm grooving insert for 4140 steel
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.