Korloy MGMN300-M NC3120 3mm Double-Ended Universal Steel Grooving Insert (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
The Original Korloy MGMN300-M NC3120 is the most versatile 3.0mm Double-Ended Grooving Insert in the lineup, designed for Universal Steel Machining. Featuring the NC3120 CVD grade, this insert is the go-to choice for workshops that process various steel types and require a single, reliable grade. It provides the perfect equilibrium between high-speed wear resistance and the shock absorption needed for light interrupted cuts on hex bars or splined shafts.
The All-Rounder Advantage: NC3120 is engineered to be the most stable grade for general steel machining. It significantly reduces tool breakage compared to harder grades while allowing for higher productivity than traditional tough grades.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | MGMN300-M |
| Insert Width (w) | 3.0 mm (+/- 0.02) |
| Grade | NC3120 (Multi-Purpose Steel Grade - CVD) |
| Chipbreaker | -M (Universal Stable Geometry) |
Core Performance Benefits:
- Broad Application Range: Excels in carbon steel, alloy steel, and mild steel, reducing the need for frequent insert changes.
- Thermal Stability: The advanced CVD coating protects the edge during high-speed parting operations.
- Anti-Chipping Substrate: Specifically formulated to resist micro-chipping, ensuring a consistent surface finish throughout the tool's life.
- Efficient Chip Control: The -M geometry curls and breaks chips effectively to prevent long "bird-nest" strings in the work area.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Low Carbon Steel (1020/A3) | 120 - 240 m/min | 0.08 - 0.20 mm/rev |
| Alloy Steel (4140/SCM440) | 100 - 190 m/min | 0.06 - 0.16 mm/rev |
| Tool Steel (Stable) | 80 - 160 m/min | 0.05 - 0.12 mm/rev |
Compatible Tool Holders:
Pairs perfectly with standard 3.0mm MGEHR/L (External) and MGIVR (Internal) tool bars:
- External Holders: MGEHR 1616-3 / 2020-3 / 2525-3
- Internal Holders: MGIVR 2016-3 / 2520-3
Steel Grade Pro Tip: NC3120 vs. NC3020/NC3030
Choosing the right 3mm steel grade depends on your specific machining stability:
The Universal Worker. Best for a mix of continuous and light interrupted cuts. Excellent all-round choice for 90% of steel jobs.
The Speed King. Best only for stable, continuous cutting. Higher wear resistance but more prone to chipping.
The Tough Tank. Best for heavy interruptions and manual machines. Maximum toughness but slower cutting speeds.
Machinist's Pro Tip: For the MGMN300-M NC3120, a stable 3.0mm width allows for aggressive parting. If you hear excessive vibration, slightly increase your feed rate ($f$) to load the tool and stabilize the cut. Always ensure your tool is set to the exact center height for a flat parting face.
Packaging: 10 pieces per box.
Korloy MGMN300-M NC3120 price, 3mm steel grooving insert for CNC factory, MGMN300-M feeds and speeds for carbon steel, universal grooving grade for steel NC3120, 3.0mm parting tool 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.