Korloy SNMG120408-HM NC3020 0.8mm Steel Turning Insert (10pcs)
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The Original Korloy SNMG120408-HM NC3020 is the definitive choice for high-speed, medium-to-heavy Steel (P-Group) turning. Featuring a reinforced 0.8mm Corner Radius, this insert offers significantly better edge toughness and thermal mass than the 0.4mm version, making it ideal for roughing and semi-finishing passes. The NC3020 CVD Coating provides a thick, heat-resistant barrier that excels in continuous high-speed dry cutting, while the -HM (Highly Medium) chipbreaker ensures excellent chip control even at deep cuts.
Built for Productivity: The combination of a negative square geometry (8 edges) and the robust 0.8mm radius makes the SNMG120408-HM the most economical "workhorse" for steel shops. It delivers longer tool life and higher metal removal rates in materials like S45C, 4140, and A36.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | SNMG120408-HM |
| Corner Radius | 0.8 mm (High Strength) |
| Cutting Edges | 8 Edges (Double-Sided) |
| Grade | NC3020 (Premium CVD for Steel) |
Core Performance Benefits:
- CVD Technology: Optimized for high-speed machining, the multi-layered coating prevents crater wear and edge deformation.
- Enhanced Edge Strength: 0.8mm radius handles vibrations and light interruptions better than finer radii.
- Robust HM Geometry: Designed for chip breaking in a wide range of materials, from soft carbon steel to tough alloy steels.
- Exceptional Economy: 8 usable corners per insert significantly lower your tooling budget.
Recommended Cutting Parameters (Steel):
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (S45C) | 150 - 320 m/min | 0.20 - 0.45 mm/rev | 1.5 - 5.0 mm |
| Alloy Steel (4140) | 120 - 280 m/min | 0.15 - 0.35 mm/rev | 1.2 - 4.5 mm |
| Mold Steel (P20) | 100 - 200 m/min | 0.12 - 0.30 mm/rev | 1.0 - 4.0 mm |
Compatible Tool Holders:
Universal fit for 12.7mm (1/2") IC negative holders:
- External Turning: MSSNR 2525M12 / 3232P12
- Internal Boring Bars: S32T-MSSNR12 / S40U-MSSNR12
Machinist Tip: NC3020 vs. NC3120
Fine-tuning your grade selection for steel turning:
Best for Continuous Cuts. This is your go-to grade for 90% of steel applications. It offers the best balance of speed and wear resistance on stable machine setups.
Interrupted Cuts. If you are machining hexagonal bars or parts with holes/keyways, NC3120 has a tougher substrate to prevent the edge from snapping during impacts.
Pro Advice: When roughing with SNMG120408-HM, ensure you don't run the tool too slow. CVD coatings like NC3020 require heat to reach their peak performance. Increase your speed ($Vc$) to ensure the chips are hot and blue for maximum tool life.
Packaging: 10 pieces per box.
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