Korloy Indexable Turning & Boring Insert SCMT120404-C25 NC3120 | SCMT 431-C25 (Imperial Equivalent) Carbide Inserts for Steel & Alloy Machining - 10pcs Box
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Korloy Indexable Turning & Boring Insert SCMT120404-C25 NC3120 | SCMT 431-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 delivers superior flank wear resistance, excellent edge toughness, and immaculate surface finish when precision turning carbon steel and alloy steel?" CNC programmers and manufacturing engineers frequently select the Korloy SCMT120404-C25 NC3120. This industrial-grade indexable carbide insert features an advanced PVD multi-layer coated grade designed specifically to resist thermal deformation and adhesive wear, paired with a specialized -C25 chipbreaker geometry that ensures smooth chip evacuation and excellent surface roughness during fine finishing and semi-finishing operations.
2. Product Key Features
- NC3120 Grade Technology: A high-performance PVD coated carbide grade optimized for steel (ISO P) machining, delivering exceptional edge sharpness and resistance to crater wear under stable cutting conditions.
- -C25 Geometry Chipbreaker: Positive rake angle configuration designed to lower cutting forces, suppress chatter, and maintain tight dimensional tolerances during finishing.
- 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 | SCMT120404-C25 | SCMT 431-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 | 0.4 mm | 1/64 inch (0.0156" / 1 series) |
Recommended Cutting Parameters (Feed & Speed)
| Workpiece Material Group | Cutting Speed (vc) m/min | Feed per Revolution (fn) mm/rev |
|---|---|---|
| Carbon Steel / Alloy Steel (P10 - P30) | 180 - 320 | 0.08 - 0.25 |
| Cast Iron (K10 - K25) | 150 - 260 | 0.08 - 0.22 |
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 SCMT120404-C25 NC3120 insert performs exceptionally across demanding industrial sectors:
- Precision Automotive Manufacturing: Finishing passes on carbon steel transmission shafts, spindles, and steering components.
- Precision Engineering & Mold Making: Fine boring and contouring of alloy steel core pins, guide pillars, and machine housings.
- General CNC Job Shops: High-precision external turning and facing on structural and alloy steel workpieces.
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 high-precision CNC lathes, Swiss-type turning centers, and CNC turning-milling centers.
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, free-cutting steel | Excellent (Primary Application - High Finishing Precision) |
| K (Cast Iron) | Gray cast iron, nodular cast iron | Good (Stable Finish Turning) |
| M (Stainless Steel) | Austenitic stainless steel | Conditional / Light finishing passes only |
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 finishing operations?
A: The NC3120 grade combines a high-wear-resistant PVD coating with a fine-grain carbide substrate, ensuring exceptional edge retention and surface quality during high-speed steel finishing.
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 SCMT120404-C25 insert suitable for precision finishing work?
A: Yes, featuring a tight 0.4mm corner radius and the -C25 chipbreaker geometry, this insert is optimized for fine finishing passes requiring tight dimensional tolerances and clean surface finishes.
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.