Korloy SPMT07T208-PD PC3500 Heavy-Duty U-Drill & Milling Insert (10pcs)
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The Original Korloy SPMT07T208-PD PC3500 is a heavy-duty Square Indexable Insert engineered for large-diameter Indexable U-Drills and robust milling applications. The PC3500 Grade is a high-performance CVD-coated carbide designed to excel in the Massive Material Removal of Steel (P-Group). With an enlarged 0.8mm corner radius and a high-strength "PD" chipbreaker, this insert provides the ultimate stability required for deep-hole drilling in tough alloy and carbon steels.
Heavy-Duty Specialist: The 07T2 size is built for power. When paired with the PC3500 CVD coating, it offers maximum resistance to the crater wear and high temperatures generated at the outer periphery of 28mm-33mm indexable drills.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Designation | SPMT07T208-PD |
| Corner Radius (r) | 0.8 mm (Enhanced Strength) |
| Grade | PC3500 (Heavy-Duty CVD for Steel) |
| Target Material | Carbon Steel, Alloy Steel, Mold Steel |
Core Performance Benefits:
- Enhanced Edge Rigidity: The 0.8mm radius is specifically designed to resist chipping under the high feed rates common in large-diameter drilling.
- Thermal Barrier Coating: The multi-layer CVD technology protects the carbide substrate from heat-related deformation during long production cycles.
- Efficient Chip Management: The PD geometry forces thick chips to collapse into manageable sizes, ensuring they are easily flushed out by coolant through the drill flutes.
- High Accuracy: Precision-ground edges ensure that hole diameters remain consistent, even as the insert wears.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn/fz) |
|---|---|---|
| Mild Steel / 1018 | 180 - 300 m/min | 0.08 - 0.18 mm/rev |
| Alloy Steel / 4140 | 140 - 240 m/min | 0.07 - 0.16 mm/rev |
| Mold Steel (P20/H13) | 100 - 180 m/min | 0.06 - 0.14 mm/rev |
Compatible Tooling Systems:
Fits all high-performance tools using the SPMT 07T2 pocket:
- Large Indexable Drills: King Drill (27.5mm - 33.5mm range)
- Face Milling Cutters: Heavy-Duty Indexable End Mills & Face Mills
Machinist Tip: The 0.8mm Radius Advantage
Why the SPMT07T208 is the heavy-duty standard:
Speed & Heat. On a 30mm U-drill, the outer insert travels much faster than the inner. PC3500's CVD coating is essential here to prevent the edge from softening due to heat.
Anti-Chipping. Compared to R0.4, the R0.8 radius on this insert provides a much stronger "toe," which is critical for handling the initial impact when the drill contacts the workpiece surface.
Pro Advice: When drilling holes deeper than 3xD with SPMT07 inserts, always use an "incremental start" or reduce the feed rate by 20% for the first 5mm of the hole to ensure the drill body remains perfectly centered.
Packaging: 10 pieces per box.
Korloy SPMT07T208-PD technical drawing, SPMT 07T208 insert for 28mm-33mm U-drill, PC3500 grade speed and feed chart, heavy duty square milling insert for alloy steel, SPMT07T208-PD vs PC5300 toughness