Korloy Indexable Turning & Boring Insert SCMT09T304-C25 NC3120 | SCMT 321-C25 (Imperial Equivalent) Carbide Inserts for Stainless Steel & Alloy Steel Machining - 10pcs Box
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Korloy Indexable Turning & Boring Insert SCMT09T304-C25 NC3120 | SCMT 321-C25 (Imperial Equivalent) Carbide Inserts for Stainless Steel & Alloy Steel Machining - 10pcs Box
High-Performance ISO-Standard Indexable Cutting Tools for Industrial CNC Stainless Steel & Alloy Steel Finishing Applications
1. Product Overview
"Which indexable turning insert is best suited for precision finishing of stainless steels and difficult-to-machine alloy materials while preventing built-up edge and surface degradation?" CNC programmers and manufacturing professionals frequently select the Korloy SCMT09T304-C25 NC3120. This industrial-grade indexable carbide insert features an advanced PVD multi-layer coated grade engineered for superior thermal shock resistance and chemical stability, paired with a specialized -C25 chipbreaker geometry and a precise 0.4mm corner radius designed to optimize chip control and deliver mirror-like surface finishes during continuous turning operations.
2. Product Key Features
- NC3120 Grade Technology: A specialized tough PVD coated carbide grade designed specifically for austenitic stainless steel (ISO M-class) and alloy steel turning, offering exceptional resistance to notch wear and thermal cracking.
- -C25 Geometry & 0.4mm Radius: Positive rake design featuring a sharp cutting edge and fine 0.4mm corner radius to minimize cutting resistance and suppress burr formation on demanding workpieces.
- ISO/ANSI Standard Compliance: Manufactured strictly under international cutting tool standards, ensuring absolute dimensional interchangeability and secure toolholder clamping.
- Shop Floor Ready Box: Conveniently packaged in industrial factory-sealed boxes of 10 pieces to maximize productivity and streamline cutting tool inventory management.
3. Technical Specifications & Model Breakdown
Examine the comprehensive parameter specifications, metric and imperial equivalents, and ISO coding breakdown below for accurate CNC lathe integration.
Metric vs. Imperial Designation Comparison
| Specification Parameter | Metric Standard (ISO) | Imperial Equivalent (ANSI) |
|---|---|---|
| Primary Insert Model | SCMT09T304-C25 | SCMT 321-C25 |
| Inscribed Circle (I.C.) / Size | 9.525 mm (09) | 3/8 inch (3 series) |
| Insert Thickness (T3) | 3.97 mm | 11/64 inch (2 series) |
| Corner Radius (04) | 0.4 mm | 1/64 inch (1 series / 0.0156") |
Recommended Cutting Parameters (Feed & Speed)
| Workpiece Material Group | Cutting Speed (vc) m/min | Feed per Revolution (fn) mm/rev |
|---|---|---|
| Austenitic Stainless Steel (M10 - M25) | 120 - 220 | 0.08 - 0.25 |
| Alloy Steel & Carbon Steel (P15 - P30) | 160 - 260 | 0.10 - 0.28 |
Need matching external turning tool holders or internal boring bars for your SCMT inserts?
Explore Compatible S-Series Tool Holders4. Product Application Scenarios
The Korloy SCMT09T304-C25 NC3120 insert excels across high-precision machining environments:
- Chemical & Medical Equipment: Precision finishing of 304, 316, and duplex stainless steel valves, fittings, and surgical instrument components.
- Automotive Powertrain Production: Machining corrosion-resistant shafts, fuel system components, and alloy steel drive pins.
- General Precision Engineering: Continuous outer diameter (OD) and inner diameter (ID) turning operations demanding exceptional surface texture integrity.
5. Compatibility
Designed to integrate perfectly into standard industrial toolholding systems:
- Tool Holders: Fully compatible with ISO standard external turning tool holders (e.g., SCLCR/L, CSSPR series) and internal boring bars configured with 9.525mm square insert pockets.
- CNC Machinery: Optimized for high-speed CNC lathes, Swiss-type turning machines, and conventional engine lathes.
6. Material Comparison & Workpiece Matrix
Review grade applicability across ISO material categories to maximize tool performance and prevent premature wear.
| ISO Material Category | Target Materials | NC3120 Performance Suitability |
|---|---|---|
| M (Stainless Steel) | Austenitic (304, 316), ferritic, and martensitic stainless steels | Excellent (Primary Stainless Finishing Application) |
| P (Alloy Steel) | Low alloy steels, carbon steels, heat-treated structural steels | Good (Stable Continuous Turning) |
| S (Superalloys) | Nickel-based alloys, titanium alloys (light finishing only) | Conditional / Light general profiling |
7. Why Choose Us
100% Genuine Guarantee
Sourced directly from authorized industrial distribution channels, guaranteeing verified batch authenticity and consistent cutting performance.
Fast Global Logistics
Maintained warehouse stock and streamlined international shipping networks ensure rapid dispatch to eliminate production delays.
Technical Expertise
Backed by professional CNC application engineers available to provide customized cutting data recommendations and troubleshooting support.
8. Frequently Asked Questions (FAQ)
Q: What makes the NC3120 grade ideal for machining stainless steel?
A: The NC3120 grade utilizes a specialized PVD multi-layer coating engineered to resist the high thermal stress and chemical affinity typical when turning stainless steels, significantly reducing built-up edge formation.
Q: How many inserts are supplied in a single standard box?
A: Each standard industrial package contains 10 factory-sealed indexable carbide inserts, individually protected against transit impact and environmental corrosion.
Q: Can the SCMT09T304-C25 be used for roughing operations?
A: This insert and chipbreaker combination is optimized primarily for precision finishing and light semi-finishing passes. For heavy roughing cuts, selecting a robust negative insert design is recommended.
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.