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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Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.