Korloy SCMT09T308-HMP NC3020 0.8mm Radius Steel Turning Insert (10pcs)
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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.
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