Korloy SNMG120408-HM NC3030 Heavy-Duty Interrupted Steel Insert (10pcs)
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The Original Korloy SNMG120408-HM NC3030 is a specialized Double-Sided Square Turning Insert designed for the most demanding Steel (P-Group) applications. Featuring a robust 0.8mm Corner Radius and the ultra-tough NC3030 CVD Grade, this insert is the industry's answer to heavy interrupted cuts and unstable machining environments. The -HM (Highly Medium) chipbreaker provides a reinforced cutting edge that excels in removing large volumes of material while maintaining excellent chip control in carbon and alloy steels.
The Toughness Champion: NC3030 is specifically engineered to handle the shock of repeated impacts. If you are machining parts with cross-holes, keyways, or raw surfaces where other inserts chip or snap, the SNMG120408-HM NC3030 provides the process security you need to keep your machines running.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | SNMG120408-HM |
| Corner Radius | 0.8 mm (Maximum Edge Strength) |
| Edges | 8 Usable Cutting Edges |
| Grade | NC3030 (CVD Optimized for Impact) |
Core Performance Benefits:
- Extreme Shock Resistance: The specialized substrate acts as a "cushion" during interrupted cuts, preventing micro-cracking and sudden failure.
- Reinforced Radius (0.8mm): Distributes cutting forces and heat more effectively than a 0.4mm tip, ideal for heavy removal passes.
- Stable CVD Coating: Provides a thick thermal barrier that protects the tool during dry cutting and high-load operations.
- Reliable Chip Breaking: The HM geometry is wide enough to handle a massive range of depths, ensuring safety for the operator and machine.
Recommended Cutting Parameters (Heavy Duty Steel):
| Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Forged Steel / Black Skin | 100 - 220 m/min | 0.20 - 0.50 mm/rev | 1.5 - 5.5 mm |
| Strong Interrupted Cuts | 80 - 180 m/min | 0.15 - 0.35 mm/rev | 1.0 - 4.5 mm |
| Alloy Steel (4140/4340) | 100 - 200 m/min | 0.18 - 0.40 mm/rev | 1.2 - 5.0 mm |
Compatible Tool Holders:
Precision matched for heavy-duty 12.7mm (1/2") IC holders:
- Standard External: MSSNR 2525M12 / 3232P12
- Large Boring Bars: S32T-MSSNR12 / S40U-MSSNR12
Machinist Tip: Why NC3030 is your Insurance Policy
Optimizing SNMG120408-HM performance in rough conditions:
Safety over Speed. Use this grade for raw steel, forgings, or any job where the cut isn't continuous. It prevents the tip from snapping, which saves your expensive tool holder from damage.
High-Speed Production. If your steel is clean (cold-rolled or pre-turned) and the cut is smooth, NC3020 will give you a longer life at higher speeds. Switch back to NC3030 only when the going gets tough.
Pro Advice: When roughing with SNMG120408-HM NC3030, don't be afraid to push the feed rate ($fn$). This grade thrives under pressure. Higher feed rates help stabilize the cutting edge and ensure the chipbreaker curls the chip away from the fresh surface.
Packaging: 10 pieces per box.
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