Korloy SPMT120408-NCM325 Steel & Cast Iron Indexable Insert (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
The Original Korloy SPMT120408-NCM325 is a high-toughness Square Indexable Insert designed for Indexable U-Drills and heavy-duty milling applications. Featuring the specialized NCM325 Grade, this insert is optimized for the stable machining of Steel (P-Group) and Cast Iron (K-Group). It is the ideal choice for workshops looking for a balance between high wear resistance and the ability to handle interrupted cuts or unstable setups.
The Stability Expert: NCM325 is engineered to reduce coating delamination (peeling). In SPMT12 applications—where tool pressure can be high—the NCM325 substrate provides the mechanical strength needed to maintain precision and prevent catastrophic failure in 40mm-50mm drilling cycles.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Designation | SPMT120408 |
| Corner Radius (r) | 0.8 mm |
| Grade | NCM325 (CVD Multi-Coating) |
| Main Application | Carbon Steel, Alloy Steel, Cast Iron |
Core Performance Benefits:
- Enhanced Coating Adhesion: The NCM325 grade features a specialized transition layer that prevents the coating from peeling under high-pressure drilling.
- Broad Application Range: Excellent performance in general steel and particularly effective on Grey and Ductile Cast Iron.
- Optimized R0.8 Edge: The 0.8mm radius provides a robust cutting edge, minimizing the risk of edge breakdown during heavy chip removal.
- Versatile Geometry: Works seamlessly in both internal and external pockets of indexable drills.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn/fz) |
|---|---|---|
| Low/Medium Carbon Steel | 150 - 250 m/min | 0.08 - 0.22 mm/rev |
| Alloy Steel (4140) | 120 - 200 m/min | 0.07 - 0.18 mm/rev |
| Grey Cast Iron | 100 - 220 m/min | 0.10 - 0.25 mm/rev |
Compatible Tooling Systems:
Precision-matched for 12-pocket high-torque tools:
- Heavy-Duty U-Drills: King Drill (40mm - 50mm Range)
- Face Milling Cutters: Large Diameter Indexable Cutters for SPMT12
Tech Tip: Choosing the Right Grade
How NCM325 compares to other Korloy favorites:
The Tough Multi-Tasker. Best for general-purpose steel machining where the workpiece has scale, crust, or the machine has moderate vibration. Also excels in Cast Iron.
The Speed Specialist. Choose PC3500 for clean, high-speed production runs in Steel to maximize wear resistance. It's more brittle than NCM325 but lasts longer in stable cuts.
Pro Advice: If you are experiencing "flaking" or the coating peeling off before the edge is worn out, NCM325 is your solution. It provides the adhesion necessary for long, uninterrupted cycles.
Packaging: 10 pieces per box.
Korloy SPMT120408-NCM325 cutting data, NCM325 grade vs PC3500 for steel, best insert for drilling cast iron holes, 12.7mm square indexable insert for U-drill, stable machining with Korloy NCM325
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.