Korloy SCMT120408-HMP NC3030 Tough Steel Turning Insert 0.8mm (10pcs)
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The Original Korloy SCMT120408-HMP NC3030 is a heavy-duty Square (7° Positive) Turning Insert, specifically engineered for the most demanding Steel (P-Group) machining conditions. Featuring the NC3030 CVD Grade, this insert is the industry standard for Interrupted Cuts, where impact resistance is more critical than pure speed. The 0.8mm Corner Radius provides substantial edge strength, while the -HMP (Highly Medium Performer) geometry ensures consistent chip control across semi-finishing and light-roughing operations.
Built for Stability: NC3030 is designed to prevent catastrophic edge failure. If your machining setup involves vibration, long overhangs, or workpieces with uneven surfaces (like forged parts or hex bars), the SCMT120408-HMP NC3030 provides the ultimate "insurance policy" against chipping.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | SCMT120408-HMP |
| Corner Radius | 0.8 mm (Maximum Edge Strength) |
| Inscribed Circle (IC) | 12.7 mm |
| Grade | NC3030 (Ultra-Tough CVD for Steel) |
Core Performance Benefits:
- Shock-Resistant CVD Grade: NC3030 features a specialized substrate that absorbs impact, preventing crack propagation in interrupted cuts.
- 0.8mm Radius Advantage: Enables higher feed rates and significantly increases the tool's resistance to heat and pressure.
- Precision HMP Geometry: Wave-shaped chipbreaker provides crisp, clean chips in the medium depth-of-cut range (1.0mm - 4.0mm).
- Large IC Rigidity: The SCMT1204 size is perfect for high-power lathes and large-scale manufacturing.
Recommended Cutting Parameters (Steel):
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (S45C) | 140 - 280 m/min | 0.20 - 0.45 mm/rev | 1.0 - 5.0 mm |
| Alloy Steel (4140/SCM440) | 120 - 240 m/min | 0.15 - 0.35 mm/rev | 1.0 - 4.5 mm |
| Forged Steel / Scaly surface | 100 - 200 m/min | 0.18 - 0.40 mm/rev | 1.5 - 4.5 mm |
Compatible Tool Holders:
Precision fit for heavy-duty 12.7mm IC tool pockets:
- External Turning: SSDC 2525 / 3232 / 4040 Series
- Internal Boring: S32T-SSDC12 / S40U-SSDC12 / S50V-SSDC12
Machinist Tip: Choosing NC3030 for Heavy Work
When to select the "Toughness Expert" over the "Speed Expert":
Interrupted Cut King. Use this for parts with splines, cross-holes, or when turning the raw outer skin of forged bars. It trades a bit of speed for massive reliability.
Continuous Cut King. Better for smooth turning of clean bar stock. It offers more wear resistance at high RPMs but is more likely to shatter during impact.
Pro Advice: For the SCMT120408-HMP NC3030, if you notice the tool is pushing or vibrating, check your feed rate ($fn$). With a 0.8mm radius, the feed should be robust (above 0.25mm) to ensure the chip is thick enough to break cleanly on the HMP breaker.
Packaging: 10 pieces per box.
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