Korloy SCMT120404-C25 NC3120 CVD Coated Steel Turning Insert (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
The Original Korloy SCMT120404-C25 NC3120 is a robust Square (7° Positive) Turning Insert, specifically designed for high-efficiency material removal in Steel (P-Group). Featuring the premium NC3120 CVD Coating, this insert provides a superior thermal barrier and exceptional flank wear resistance. The -C25 Chipbreaker is optimized for medium-to-roughing operations, ensuring reliable chip breaking and edge stability even under high-load conditions in large-scale machining projects.
Heavy-Duty Stability: The SCMT1204 size is the workhorse of heavy industry. With its increased thickness and the NC3120's multi-layer CVD technology, it excels in continuous cutting of carbon, alloy, and tool steels where heat dissipation and tool life are the primary concerns.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | SCMT120404-C25 |
| Inscribed Circle (IC) | 12.7 mm |
| Thickness / Corner Radius | 4.76 mm / 0.4 mm |
| Grade | NC3120 (CVD Multi-Layer for Steel) |
Core Performance Benefits:
- Extreme Thermal Resistance: Thick CVD coating (Al2O3 + TiCN) allows for significantly higher cutting speeds compared to standard PVD grades.
- Powerful Chip Control: The -C25 geometry manages thick chips effortlessly, reducing machine downtime and preventing workpiece damage.
- Superior Edge Strength: The 12.7mm IC size provides a massive cross-section, ensuring the insert can handle deep cuts in tough alloy steels.
- Extended Service Life: Designed to maintain dimensional accuracy over long production runs in high-speed steel turning.
Recommended Cutting Parameters (Steel):
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (S45C) | 180 - 320 m/min | 0.15 - 0.45 mm/rev | 1.0 - 5.0 mm |
| Alloy Steel (4140/4340) | 140 - 260 m/min | 0.12 - 0.35 mm/rev | 1.0 - 4.0 mm |
| Structural Steel | 160 - 280 m/min | 0.20 - 0.50 mm/rev | 1.5 - 5.0 mm |
Compatible Tool Holders:
Fits all standard ISO 12mm square pocket tool holders:
- External Turning Holders: SSDC 2020 / 2525 / 3232 Series
- Internal Boring Bars: S20R-SSDC12 / S25S-SSDC12 / S32T-SSDC12
Machinist Tip: Scaling for Heavy Production
Why SCMT1204 with NC3120 is the master of high-volume steel work:
CVD Excellence. For large diameter workpieces, NC3120 allows you to turn faster. The Al2O3 layer resists the heat that would soften a PVD grade, keeping your productivity at peak levels.
Depth of Cut Control. SCMT1204 is often used for deep cuts. The -C25 geometry is reinforced to handle these high forces without edge chipping, unlike finish-oriented "light" geometries.
Pro Advice: When using SCMT120404-C25 NC3120, ensure your boring bar or tool holder has maximum rigidity. In deep cuts on large shafts, even a 0.4mm radius can cause vibration if the setup isn't secure. For maximum stability, use a 25mm or 32mm shank holder.
Packaging: 10 pieces per box.
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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.