Korloy MGMN300-M NC3030 3mm Double-Ended Tough Steel Grooving Insert (10pcs)
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The Original Korloy MGMN300-M NC3030 is a high-performance 3.0mm Double-Ended Grooving Insert specifically engineered for Steel Machining under Challenging Conditions. In operations where mechanical shock is unavoidable—such as interrupted cuts, heavy scale, or older machine setups—the NC3030 CVD grade excels. Its robust carbide substrate and multi-layer coating provide the ultimate defense against edge chipping and sudden tool failure.
Engineered for Toughness: The 3.0mm width combined with the NC3030 grade offers a high safety margin during deep parting-off of solid steel bars. It is the go-to solution for machinists facing "crunching" or edge breakage with more brittle grades.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | MGMN300-M |
| Insert Width (w) | 3.0 mm |
| Grade | NC3030 (Heavy-Duty CVD Coated Steel Grade) |
| Chipbreaker | -M (Stable Medium-Cutting Geometry) |
Core Performance Benefits:
- Interrupted Cut Stability: Designed to handle cross-holes, keyways, and hex bars without micro-chipping.
- Advanced CVD Coating: Thick thermal barrier protects the edge during heavy-duty parting-off in high-carbon steels.
- Maximum Rigidity: The 3.0mm width ensures the tool stays vertical in deep radial cuts, preventing "walking" or coning.
- Double-Ended ROI: Two usable edges provide maximum cost-efficiency for general-purpose workshop use.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Mild Steel (Low Carbon) | 100 - 190 m/min | 0.08 - 0.20 mm/rev |
| Alloy Steel (4140/4340) | 80 - 160 m/min | 0.06 - 0.18 mm/rev |
| Cast Steel / Forgings | 70 - 140 m/min | 0.08 - 0.15 mm/rev |
Compatible Tool Holders:
Fits all 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
Choosing Your Defense: NC3030 vs. NC3120
For 3.0mm steel grooving, your choice should match your setup stability:
The Tough Shield. Use for interrupted cuts (hex, keyways) or manual lathes. Prioritizes anti-breakage. Best for low to medium speeds.
The Speed Specialist. Best for continuous CNC cuts and higher RPMs. Offers better wear resistance but is more sensitive to sudden impacts.
Machinist's Pro Tip: If your MGMN300-M NC3030 is holding up well but wearing out slowly, you are in the right spot. If the edge is "snapping" during the cut, check your tool center height—being too low is the #1 reason for breakage in tough grades like NC3030.
Packaging: 10 pieces per box.
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