Korloy MRMN400-M NC3030 4mm Full Radius R2.0 Tough Steel Profiling Insert (10pcs)
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The Original Korloy MRMN400-M NC3030 is a heavy-duty 4.0mm Full Radius (R2.0) Profiling Insert specifically engineered for Steel (P) machining where reliability is the top priority. Featuring the high-toughness NC3030 CVD coating, this insert is the premier choice for interrupted cuts, forged surfaces, and machining on older, less rigid CNC lathes. The Full Radius (Round Nose) geometry, combined with the -M (Medium) chipbreaker, provides maximum edge security and excellent chip evacuation during deep contouring of carbon and alloy steels.
The Toughness Champion: NC3030 is designed to prevent sudden brittle failure. If you are struggling with edge chipping on 4mm grooves or profiles due to surface scale or machine vibration, the NC3030's shock-absorbing substrate is your ultimate solution.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | MRMN400-M |
| Insert Shape | Full Radius (Round Nose) |
| Width / Radius | 4.0 mm / R2.0 |
| Grade | NC3030 (High-Toughness Steel CVD) |
Core Performance Benefits:
- Maximum Edge Toughness: Specialized CVD layer resists thermal shock and mechanical impact during interrupted cuts.
- Large R2.0 Full Radius: Perfect for deep, rounded channels and heavy-duty 3D profiling on large-diameter steel shafts.
- Structural Rigidity: The 4.0mm width allows for high lateral feed rates without tool deflection.
- Advanced -M Chip Control: Designed to handle medium to heavy chips, preventing "bird-nesting" in carbon steel applications.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Carbon Steel (1045 / S45C) | 110 - 190 m/min | 0.10 - 0.22 mm/rev |
| Alloy Steel (4140 / 42CrMo) | 90 - 160 m/min | 0.08 - 0.18 mm/rev |
| Heavy Forgings / Scale | 70 - 120 m/min | 0.06 - 0.15 mm/rev |
Compatible Tool Holders:
Precision 4.0mm seat fit for heavy-duty systems:
- External Holders: MGEHR 2525-4 / 3232-4 / 4040-4
- Internal Holders: MGIVR 3125-4 / 4032-4
Machinist Tip: Why choose MRMN400-M NC3030?
When grooving or profiling at 4.0mm width, the choice between NC3020 and NC3030 is critical:
The "Safe" Choice. Perfect for general workshop use where you don't always have a perfect setup. It's much better at handling the shocks of interrupted cuts and varied steel hardness.
The "Fast" Choice. Best for high-speed, continuous turning in clean steel mass production. More wear-resistant but more prone to chipping if things get bumpy.
Pro Advice: For MRMN400-M NC3030, if you encounter heavy vibration on a large shaft, try using a slightly larger tool holder shank (like 3232-4) to provide the rigid foundation this heavy-duty insert deserves.
Packaging: 10 pieces per box.
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