Korloy SNMG120404-HM NC3020 Steel Turning Insert for Medium Machining (10pcs)
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The Original Korloy SNMG120404-HM NC3020 is a heavy-duty Double-Sided Square Turning Insert engineered for high-efficiency Steel (P-Group) machining. Utilizing the advanced NC3020 CVD Coating technology, this insert offers exceptional heat resistance and flank wear resistance, making it ideal for high-speed continuous cutting. The -HM (Medium-Roughing) chipbreaker is designed with a strong land area to withstand high cutting forces while ensuring smooth chip evacuation in carbon steels and alloy steels.
Maximize Metal Removal: NC3020 is Korloy's premier grade for general steel turning. The CVD coating allows you to push the cutting speed (Vc) higher than PVD grades, significantly reducing cycle times in mass production environments.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | SNMG120404-HM |
| Corner Radius | 0.4 mm (Precision & Efficiency) |
| Edges | 8 Usable Cutting Edges |
| Grade | NC3020 (Gold-Standard CVD for Steel) |
Core Performance Benefits:
- Enhanced Thermal Stability: Multi-layer CVD coating protects the carbide substrate from crater wear during high-temperature dry cutting.
- Strong Edge Profile: The HM chipbreaker is optimized for medium-to-heavy depths of cut, providing stability against edge chipping.
- 8-Corner Economy: Dramatically lower your cost-per-edge compared to positive inserts.
- Versatile Steel Coverage: Excellent performance across mild steel (A36), carbon steel (S45C), and alloy steels (4140).
Recommended Cutting Parameters (Steel Machining):
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Low Carbon Steel | 180 - 350 m/min | 0.15 - 0.40 mm/rev | 1.0 - 4.0 mm |
| Carbon Steel (1045) | 150 - 300 m/min | 0.15 - 0.35 mm/rev | 1.0 - 4.5 mm |
| Alloy Steel (4140) | 120 - 250 m/min | 0.12 - 0.30 mm/rev | 0.8 - 3.5 mm |
Compatible Tool Holders:
Precision matched for 12.7mm IC negative tool holders:
- External Turning: MSSNR 2020 / 2525 / 3232 Series
- Boring Bars: S32T-MSSNR12 / S40U-MSSNR12
Machinist Tip: NC3020 vs. PC5300 for Steel
Choosing the right grade for your steel turning job:
The Speed King. Use NC3020 for stable, high-speed production on carbon steel. The CVD coating is thicker and survives the heat of dry, high-speed turning much better than PVD.
The Tough Fighter. Choose PC5300 if you have heavy interruptions, low RPM, or unstable machines. PC5300 is tougher against edge chipping but will wear faster at high speeds.
Pro Advice: For SNMG120404-HM NC3020, the best results are achieved when the depth of cut ($ap$) is at least 3x the feed rate. This engages the chipbreaker properly to ensure those perfect "C" shaped chips.
Packaging: 10 pieces per box.
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