Korloy SCMT09T308-HMP NC3020 0.8mm Radius Steel Turning Insert (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
The Original Korloy SCMT09T308-HMP NC3020 is a high-performance Square (7° Positive) Turning Insert, specifically optimized for high-productivity Steel (P-Group) machining. Equipped with a robust 0.8mm Corner Radius, this insert offers enhanced edge strength and enables higher feed rates while maintaining an excellent surface finish. The NC3020 CVD Grade provides a sophisticated thermal barrier, and the -HMP (Highly Medium Performer) chipbreaker is masterfully designed for consistent chip control in semi-finishing to light-roughing applications.
Engineered for Versatility: The SCMT09T308-HMP is a favorite in CNC shops for its ability to handle both external turning and internal boring. The 0.8mm radius helps prevent premature edge wear on scaly or interrupted surfaces, making it more durable than the 0.4mm variant.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | SCMT09T308-HMP |
| Corner Radius | 0.8 mm (Enhanced Edge Strength) |
| Thickness / IC | 3.97 mm / 9.525 mm |
| Grade | NC3020 (CVD Optimized for Steel) |
Core Performance Benefits:
- Enhanced Surface Finish: The larger 0.8mm radius allows for higher feed rates without compromising the theoretical surface roughness.
- Superior Red-Hardness: The NC3020 coating (TiCN+Al2O3) provides maximum protection during continuous, high-heat dry cutting.
- Efficient Chip Breaking: The HMP geometry is specifically tuned for medium cutting ranges, preventing chip build-up in small-to-medium bores.
- Lower Tool Pressure: The 7-degree positive rake reduces machine vibration, making it ideal for thin-walled parts or long boring bars.
Recommended Cutting Parameters (Steel):
| Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (S45C) | 180 - 320 m/min | 0.15 - 0.35 mm/rev | 0.8 - 3.5 mm |
| Alloy Steel (4140) | 140 - 250 m/min | 0.12 - 0.30 mm/rev | 0.8 - 2.5 mm |
| Mild Steel | 200 - 350 m/min | 0.20 - 0.40 mm/rev | 1.0 - 3.5 mm |
Compatible Tool Holders:
Precision fit for standard 9.525mm (3/8") IC tool pockets:
- External Turning: SSDC 1616 / 2020 / 2525 Series
- Internal Boring: S16Q-SSDC09 / S20R-SSDC09 / S25S-SSDC09
Machinist Tip: Why choose the 0.8mm Radius?
Radius selection impacts both tool life and surface finish:
Durability focused. The 0.8mm radius is much harder to break during interrupted cuts. It also dissipates heat better, extending tool life in alloy steels.
Precision focused. Use the 0.4mm version for very small depths of cut or when machining thin-walled parts where radial cutting force must be minimized.
Pro Advice: For the SCMT09T308-HMP, your feed rate should ideally be between 0.2mm and 0.3mm per revolution. This range perfectly engages the HMP chipbreaker to ensure short, crisp chips and zero "bird-nesting" on your machine.
Packaging: 10 pieces per box.
Korloy SCMT09T308-HMP price, 0.8 radius turning insert for steel, HMP chipbreaker for semi-finishing, NC3020 vs NC3120 feed rate, best square insert for carbon steel boring
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.