Korloy WCMT080412-C20N PC5335 Reinforced R1.2 U-Drill Insert for Extreme Impact (10pcs)
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The Original Korloy WCMT080412-C20N PC5335 (ANSI: WCMT 433) is a specialized Heavy-Duty Indexable Drill Insert built for the most demanding Large-Diameter Hole Operations. Featuring a reinforced 1.2mm (3/64") Corner Radius, this insert is specifically engineered to survive heavy impact, such as drilling through cross-holes, welded sections, or uneven surfaces. The combination of the PC5335 PVD Grade and the robust R1.2 tip makes it the toughest choice for heavy-industry machining in steel and stainless steel.
Ultimate Edge Strength: When machining large workpieces, the outer insert of a U-drill is prone to chipping due to high surface speeds and material irregularities. The WCMT 080412's larger radius distributes cutting forces more evenly, significantly extending tool life in unstable conditions.
Technical Specifications (Metric & ANSI):
| ISO Designation | WCMT 080412-C20N |
| ANSI Designation | WCMT 433 |
| Corner Radius (r) | 1.2 mm / (3/64") |
| Thickness (S) | 4.76 mm / (3/16") |
| Grade | PC5335 (Impact-Resistant PVD) |
| Target Drill Dia. | D50mm - D85mm+ Large U-Drills |
Core Performance Benefits:
- Maximum Impact Resistance: The 1.2mm radius provides a beefier cutting edge that resists the micro-chipping often caused by the high centrifugal forces of large drills.
- Enhanced Thermal Protection: PC5335's advanced multi-layer PVD coating provides a superior thermal barrier, preventing the substrate from softening during deep, high-heat drilling cycles.
- Optimized C20N Geometry: Specifically engineered to manage the wide, thick chips produced by large-diameter drilling, ensuring they are curled and flushed out without damaging the borehole.
- Industry-Leading Reliability: Perfect for machining heavy parts for the Oil & Gas, Wind Energy, and Infrastructure sectors.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) |
|---|---|---|
| High-Strength Steel | 90 - 160 m/min | 0.12 - 0.25 mm/rev |
| Duplex Stainless Steel | 70 - 130 m/min | 0.10 - 0.20 mm/rev |
Pro Tip: Handling the "Big Jobs"
If you are experiencing premature corner failure on R0.8 inserts when drilling cast surfaces or flame-cut plates, the R1.2 radius is the direct solution. The extra carbide mass at the tip prevents the edge from "collapsing" under the initial shock.
For heavy drilling, maintain an 8-12% coolant concentration. This ensures the R1.2 radius remains lubricated during the entire cut, preventing the friction welding common in stainless steels.
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.