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
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.