Korloy WCMT080408-C20N PC5335 Extra Heavy-Duty U-Drill Insert (10pcs)
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The Original Korloy WCMT080408-C20N PC5335 (ANSI: WCMT 432) is the absolute powerhouse of the Indexable Drill series. Specifically designed for Ultra-Large Diameter Shallow Hole Machining, the 08-size insert features a reinforced 4.76mm thickness. This is the ultimate tool for heavy-duty manufacturing in the energy, marine, and defense sectors, where drilling massive holes in tough materials like 4140 steel or 316L stainless requires maximum edge stability. The PC5335 PVD Grade provides the essential toughness to prevent fracture under the extreme torques of large-diameter drilling.
Heavy Industrial Standard: At the 08 size, cutting forces are immense. The PC5335's advanced PVD coating acts as a shield against intense friction and heat, while the extra-thick carbide substrate ensures the insert won't crack during high-feed breakthroughs in thick-walled workpieces.
Technical Specifications (Metric & ANSI):
| ISO Designation | WCMT 080408-C20N |
| ANSI Designation | WCMT 432 |
| Thickness (S) | 4.76 mm |
| Corner Radius (r) | 0.8 mm |
| Grade | PC5335 (Extreme Toughness PVD) |
| Target Diameter | D50mm - D80mm+ U-Drills |
Core Performance Benefits:
- Maximum Structural Rigidity: The 4.76mm thickness is the thickest in the WCMT series, specifically built to handle the mechanical shocks of large-hole drilling.
- Optimized C20N Geometry: Designed to break very thick chips into small "C" shapes, ensuring they don't jam in the large flutes of big U-drills.
- Versatile PC5335 Grade: Excels in both Carbon Steel (P) and Stainless Steel (M), reducing downtime for insert changes in multi-material shops.
- Three Precision Edges: The Trigon geometry offers three usable edges, making it a highly economical choice for large-diameter drilling compared to solid tools.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) |
|---|---|---|
| Carbon & Alloy Steels | 100 - 180 m/min | 0.10 - 0.22 mm/rev |
| 300 Series Stainless | 80 - 150 m/min | 0.08 - 0.18 mm/rev |
Pro Tip: Dominating Extra Large Boreholes
Large U-drills are "spindle killers." Ensure your machine tool has the horsepower and low-end torque to pull a D60 or D80 drill. A weak spindle will cause the insert to chatter and fail prematurely.
When drilling deep with WCMT 08, chips are very thick. Use maximum coolant flow to push chips out of the borehole. If you hear a "crunching" sound, stop immediately—chips are re-cutting.
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.