Korloy SNMG150612-GR NC3120 Universal Steel Roughing Insert (10pcs)
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The Original Korloy SNMG150612-GR NC3120 is a high-performance Double-Sided Square Turning Insert designed to be the most versatile tool in your shop for Steel (P-Group) machining. Featuring the advanced NC3120 CVD Grade, this insert offers a superior balance of high-speed wear resistance and edge toughness. With a massive 1.2mm Corner Radius and a 6.35mm thickness, the -GR (Roughing) chipbreaker is engineered to handle large depths of cut and high feed rates, ensuring maximum productivity across a wide variety of steel alloys.
Next-Generation Performance: NC3120 is Korloy's response to modern machining demands. It provides better thermal stability than NC3020 and higher toughness than NC3120's predecessors, making it the "Universal First Choice" for general steel turning, from mild carbon steel to tough alloys.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | SNMG150612-GR |
| Corner Radius | 1.2 mm (Heavy Edge Security) |
| Grade | NC3120 (New Generation CVD) |
| Application | Roughing to Medium (P15 - P35) |
Core Performance Benefits:
- Broad Application Range: NC3120 excels in both continuous and light-to-medium interrupted cuts, reducing the need for frequent tool changes.
- Optimized Heat Resistance: New coating technology allows for higher cutting speeds without the risk of plastic deformation.
- Rugged GR Geometry: The heavy-duty chipbreaker is designed to manage large, thick chips, moving heat away from the cutting edge.
- 1.2mm Strength: The larger radius provides a much stronger cutting corner, making it ideal for the "first pass" on raw, unmachined steel.
Recommended Cutting Parameters (Universal Steel):
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (1045/S45C) | 180 - 320 m/min | 0.35 - 0.70 mm/rev | 3.0 - 7.5 mm |
| Alloy Steel (4140/SCM440) | 150 - 260 m/min | 0.30 - 0.60 mm/rev | 2.5 - 6.5 mm |
| Light Interruption | 120 - 200 m/min | 0.25 - 0.45 mm/rev | 2.0 - 5.0 mm |
Compatible Tool Holders:
Precision-engineered for 15.875mm (5/8") IC negative holders:
- High-Stability External: MSSNR 2525M15 / 3232P15
Machinist Tip: Why NC3120 is the Best Choice?
Understanding Korloy's Grade Hierarchy:
The Safe Bet. If you're not sure which grade to pick, NC3120 is the safest starting point. It's tougher than NC3020 but more wear-resistant than NC3030, covering 80% of all steel turning applications.
Maximum Impact. If your NC3120 edge is still chipping due to violent impacts (like machining a square bar), only then move to NC3030 for its ultimate shock absorption.
Pro Advice: For large diameter roughing, use the 1.2mm radius of the SNMG150612-GR to your advantage. A slightly higher feed rate will actually improve tool life by stabilizing the cutting pressure and preventing "rubbing."
Packaging: 10 pieces per box.
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