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
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.