Korloy SCMT120408-C25 NC3120 0.8mm Radius Steel Turning Insert (10pcs)
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The Original Korloy SCMT120408-C25 NC3120 is a heavy-duty Square (7° Positive) Turning Insert, specifically optimized for high-productivity machining of Steel (P-Group). Featuring a robust 0.8mm Corner Radius and Korloy's advanced NC3120 CVD Coating, this insert is designed to withstand high temperatures and intense cutting forces. The -C25 Chipbreaker provides exceptional chip control at increased feed rates, making it the premier choice for roughing and semi-finishing of large shafts, structural steel, and forged components.
Maximize Metal Removal Rate (MRR): The combination of the 1204 size and 0.8mm radius allows you to "push" your CNC machine to higher feed rates without sacrificing tool integrity. The NC3120's thick Al2O3 layer ensures the edge remains sharp during prolonged contact with tough alloy steels.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | SCMT120408-C25 |
| Corner Radius | 0.8 mm (High Strength) |
| Thickness / IC | 4.76 mm / 12.7 mm |
| Grade | NC3120 (CVD Specialist for Steel) |
Core Performance Benefits:
- Durable 0.8mm Edge: Resists chipping and micro-cracking even in interrupted cuts on scaly or uneven surfaces.
- High Heat Red-Hardness: The CVD coating allows for higher dry-cutting speeds (Vc), reducing cycle times significantly.
- Aggressive Chip Breaking: The -C25 geometry forces short, manageable chips in ductile steel, protecting your workpiece and machine.
- Extended Insert Life: Superior resistance to crater and flank wear in high-volume production environments.
Recommended Cutting Parameters (Steel):
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (S45C/1045) | 180 - 320 m/min | 0.20 - 0.50 mm/rev | 1.5 - 5.0 mm |
| Alloy Steel (4140/SCM440) | 140 - 260 m/min | 0.15 - 0.40 mm/rev | 1.0 - 4.5 mm |
| Forged Steel | 120 - 220 m/min | 0.18 - 0.35 mm/rev | 1.5 - 4.0 mm |
Compatible Tool Holders:
Precision fit for $90^\circ$ square pocket holders and boring bars:
- External Turning Holders: SSDC 2525 / 3232 / 4040 Series
- Internal Boring Bars: S25S-SSDC12 / S32T-SSDC12 / S40U-SSDC12
Machinist Tip: The Power of R0.8 in NC3120
Why the SCMT120408 is the heavy-duty production choice:
Edge Strength. The 0.8mm radius is significantly tougher than the 0.4mm. It can withstand the "hammering" effect of scale or interrupted cuts common in raw steel stock.
Thermal Stability. While PVD (like PC5300) is tough, CVD NC3120 is built for speed. Use it for long, continuous cuts where heat would normally cause the edge to deform.
Pro Advice: When roughing with SCMT120408-C25 NC3120, ensure your feed ($fn$) is above 0.2mm/rev. This keeps the chip thick enough to engage the -C25 breaker properly, preventing long, stringy chips that can wrap around the tool.
Packaging: 10 pieces per box.
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