Korloy Indexable Turning & Boring Insert SCMT120408-C25 NC3120 | SCMT 432-C25 (Imperial Equivalent) Carbide Inserts for Steel & Alloy Machining - 10pcs Box
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Korloy Indexable Turning & Boring Insert SCMT120408-C25 NC3120 | SCMT 432-C25 (Imperial Equivalent) Carbide Inserts for Steel & Alloy Machining - 10pcs Box
High-Performance ISO-Standard Indexable Cutting Tools for Industrial CNC Steel & Alloy Turning Applications
1. Product Overview
"Which indexable turning insert provides exceptional flank wear resistance and thermal stability when roughing or finishing carbon steel and alloy steel at high cutting speeds?" CNC programmers and manufacturing engineers frequently select the Korloy SCMT120408-C25 NC3120. This industrial-grade indexable carbide insert features an advanced PVD multi-layer coated grade designed specifically to resist thermal cracking and deformation, paired with a specialized -C25 chipbreaker geometry that ensures smooth, controlled chip breakage during aggressive turning and boring operations.
2. Product Key Features
- NC3120 Grade Technology: A high-performance PVD coated carbide grade optimized for steel (ISO P) and alloy steel machining, delivering superior edge toughness and wear resistance under continuous or light interrupted cutting conditions.
- -C25 Geometry Chipbreaker: Positive rake angle design engineered to reduce cutting forces, suppress vibration, and prevent stringy chip formation during general turning.
- ISO/ANSI Standard Compliance: Manufactured strictly under international cutting tool standards to guarantee absolute indexing repeatability and secure toolholder pocket clamping.
- High Productivity Package: Supplied in industrial factory-sealed boxes of 10 pieces to minimize tool changeover downtime and streamline shop floor inventory.
3. Technical Specifications & Model Breakdown
Review the comprehensive parameter specifications, metric-to-imperial conversions, and ISO model code breakdown below for seamless integration into your CNC machining environment.
Metric vs. Imperial Designation Comparison
| Specification Parameter | Metric Standard (ISO) | Imperial Equivalent (ANSI) |
|---|---|---|
| Primary Insert Model | SCMT120408-C25 | SCMT 432-C25 |
| Inscribed Circle (I.C.) | 12.7 mm | 1/2 inch (0.500" / 4 series) |
| Insert Thickness (04) | 4.76 mm | 3/16 inch (0.1875" / 3 series) |
| Corner Radius | 0.8 mm | 1/32 inch (0.0313" / 2 series) |
Recommended Cutting Parameters (Feed & Speed)
| Workpiece Material Group | Cutting Speed (vc) m/min | Feed per Revolution (fn) mm/rev |
|---|---|---|
| Carbon Steel / Alloy Steel (P15 - P35) | 160 - 280 | 0.15 - 0.45 |
| Cast Iron (K15 - K30) | 140 - 240 | 0.15 - 0.40 |
Looking to pair these inserts with compatible external turning tool holders or boring bars?
Browse Compatible S-Series Turning Tool Holders4. Product Application Scenarios
The Korloy SCMT120408-C25 NC3120 insert performs exceptionally across demanding industrial sectors:
- Automotive Powertrain Machining: External turning and facing of carbon steel shafts, axle components, and forged gear blanks.
- Heavy Machinery & Equipment: Rough and semi-finish boring of large alloy steel sleeves and industrial roller housings.
- General Job Shop Production: Versatile contouring and facing operations on structural steel plates and components.
5. Compatibility
Engineered to integrate seamlessly into standard industrial tooling setups:
- Tool Holders: Fully compatible with ISO standard external turning tool holders (e.g., CSKPR, CSBCL, CSSPR series) and internal boring bars featuring 12.7mm square insert pockets.
- Machine Tools: Optimized for CNC lathes, CNC turning centers, and heavy-duty conventional engine lathes.
6. Material Comparison & Workpiece Matrix
Understanding grade characteristics ensures maximum metal removal rates and safeguards against premature edge breakdown.
| ISO Material Category | Target Materials | NC3120 Performance Suitability |
|---|---|---|
| P (Steel) | Carbon steel, alloy steel, structural steel | Excellent (Primary Application - High Wear Resistance) |
| K (Cast Iron) | Gray cast iron, ductile cast iron | Good (Stable Continuous Turning) |
| M (Stainless Steel) | Austenitic and ferritic stainless steel | Conditional / Moderate cutting speeds |
7. Why Choose Us
100% Genuine Guarantee
Sourced directly from authorized manufacturers, guaranteeing verified batch authenticity and consistent industrial tool performance.
Fast Global Logistics
Maintained warehouse inventory and optimized international shipping lines ensure rapid dispatch to eliminate production line bottlenecks.
Technical Expertise
Backed by professional CNC application engineers available to provide customized cutting data recommendations and troubleshooting.
8. Frequently Asked Questions (FAQ)
Q: What makes the Korloy NC3120 grade ideal for steel turning operations?
A: The NC3120 grade features a robust PVD nano-structured multi-layer coating combined with a high-toughness carbide substrate, providing exceptional resistance to flank wear and thermal deformation during high-speed steel machining.
Q: How many inserts are included in each factory package?
A: Each standard industrial box contains 10 factory-sealed indexable carbide inserts, individually protected against shipping shock and environmental contamination.
Q: Is the SCMT120408-C25 insert suitable for roughing cuts?
A: Yes, featuring a robust 12.7mm inscribed circle and the -C25 chipbreaker geometry, this insert is optimized for medium to roughing external turning and boring operations requiring stable chip control.
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.