Korloy SPMT11T308-PD PC5300 Universal PVD U-Drill Insert (10pcs)
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The Original Korloy SPMT11T308-PD PC5300 is a premium Universal Square Indexable Insert designed for large-diameter Indexable U-Drills and heavy-duty milling systems. Featuring the advanced PC5300 PVD Grade, this insert is the industry standard for machining Stainless Steel (M-Group) and 难加工合金 (Exotic Alloys). It provides the ultimate balance of edge sharpness and substrate toughness required for large-scale industrial manufacturing.
The Heavy-Duty Reliability Choice: For U-drills in the 43-50mm range, the axial forces are immense. PC5300 is specifically chosen as the inner pocket insert to prevent catastrophic edge collapse at the low-speed center of the drill flutes.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Designation | SPMT11T308-PD |
| Corner Radius (r) | 0.8 mm (Reinforced) |
| Grade | PC5300 (Premium Universal PVD) |
| Application | Stainless, Steel, Titanium, Heat-Resistant Alloys |
Core Performance Benefits:
- Exceptional Toughness: The PVD TiAlN coating combined with a specialized carbide substrate prevents chipping in interrupted or heavy-load cuts.
- Precision R8 Edge: The 0.8mm radius is built to handle high radial pressure, ensuring stability during deep-hole drilling (3D/4D).
- Anti-BUE Geometry: The PD chipbreaker effectively prevents "Built-Up Edge" when machining gummy materials like 304/316 stainless steel.
- Thermal Stability: Designed to maintain a sharp cutting edge even under the fluctuating temperatures common in large-diameter drilling.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn/fz) |
|---|---|---|
| Stainless Steel (316L) | 60 - 120 m/min | 0.08 - 0.18 mm/rev |
| Alloy Steel (4140/SCM440) | 90 - 180 m/min | 0.10 - 0.22 mm/rev |
| High-Temp Alloys (Inconel) | 20 - 45 m/min | 0.06 - 0.12 mm/rev |
Compatible Tooling Systems:
Maximize your machine’s power with these compatible holders:
- Heavy-Duty U-Drills: King Drill (43mm - 50mm Range)
- Large Milling Cutters: SPMT 11T3 Facing & Shoulder Mills
Machinist Tip: The Large Hole "Security" Setup
Why PC5300 is the industry standard for big SPMT11 applications:
Unbeatable Toughness. Large drills generate massive torque. PC5300 is designed to absorb this energy. It is the mandatory grade for both pockets when drilling Stainless Steel.
The Steel Outer Hero. If you are drilling carbon steel, use PC5300 on the inner pocket and PC3500 on the outer pocket. This hybrid setup allows for high RPM while protecting the drill center.
Pro Advice: For holes near the 50mm limit, ensure your machine has sufficient horsepower (kW). Lack of power can cause the drill to stall, which will instantly fracture the SPMT11 inserts. Always use through-spindle coolant!
Packaging: 10 pieces per box.
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