Korloy SPMT090308-PD PC3500 Heavy-Duty Square U-Drill Insert (10pcs)
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The Original Korloy SPMT090308-PD PC3500 is a high-strength Square Indexable Insert designed for heavy-duty Indexable U-Drills and large-scale milling operations. The PC3500 Grade is a premier CVD-coated carbide solution specifically engineered for the High-Efficiency Machining of Steel (P-Group). With a robust 0.8mm corner radius and an optimized "PD" chipbreaker, this insert delivers maximum stability and heat resistance when drilling large-diameter holes in tough alloy and structural steels.
Maximum Metal Removal: The SPMT09 size is built for power. Combined with the PC3500 CVD technology, it provides a formidable thermal barrier, allowing for higher cutting speeds (Vc) and prolonged tool life in aggressive steel drilling cycles.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Designation | SPMT090308-PD |
| Corner Radius (r) | 0.8 mm (Heavy Duty) |
| Grade | PC3500 (CVD Multi-Layer Coating) |
| Application | Large Hole Drilling, Rough Face Milling |
Core Performance Benefits:
- Extreme Heat Resistance: The multi-layer CVD coating (TiCN+Al2O3+TiN) is designed to withstand the intense friction heat of high-speed steel drilling.
- Stable Edge Geometry: The 0.8mm radius offers superior edge toughness, minimizing the risk of chipping during entrance and exit of the cut.
- PD Chipbreaker Technology: Engineered to force thick steel chips into compact curls, ensuring smooth evacuation from deep drill flutes.
- High Productivity: Optimized for high surface speeds (Vc), allowing for shorter cycle times in large-scale manufacturing.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn/fz) |
|---|---|---|
| Low Carbon Steel (1018/1045) | 180 - 320 m/min | 0.08 - 0.20 mm/rev |
| Alloy Steel (4140/SCM440) | 140 - 260 m/min | 0.07 - 0.18 mm/rev |
| Pre-Hardened Steel (H13/P20) | 90 - 180 m/min | 0.06 - 0.14 mm/rev |
Compatible Tooling Systems:
Ensure maximum rigidity by using these professional-grade holders:
- Heavy-Duty U-Drills: King Drill (34mm - 42mm range)
- Indexable Milling Cutters: Large Diameter Face Mills for SPMT09
Machinist Tip: Scaling Up to SPMT09
Why the SPMT090308 PC3500 is the choice for heavy industry:
CVD vs. PVD. In large-diameter drilling, the center of the drill moves slowly while the outer edge moves very fast. PC3500's thick CVD coating is essential for the outer edge to survive the extreme surface speeds without burning out.
Structural Integrity. With larger hole sizes comes greater torque. The R0.8 radius provides the necessary strength to the insert tip to withstand the high radial forces without vibrating or fracturing.
Pro Advice: For U-drills over 35mm, machine stability is key. If you experience "howling" or chatter, check your spindle rigidity and ensure your internal coolant pressure is at maximum to flush those large chips.
Packaging: 10 pieces per box.
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