Korloy CNMG120404-HM NC3020 General Steel Turning Insert (10pcs)
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The Original Korloy CNMG120404-HM NC3020 (ANSI Standard: CNMG 431) is the industry's go-to solution for general-purpose steel turning. Engineered for efficiency and reliability, the NC3020 grade features a balanced CVD coating that provides excellent wear resistance at higher cutting speeds. With the 0.4mm (1/64") nose radius and the versatile HM chipbreaker, this insert is perfect for achieving precision dimensions and a high-quality surface finish on a wide range of carbon and alloy steels.
Best for Continuous Cuts: NC3020 is optimized for stable machining conditions, offering higher red-hardness than the NC3030 series for faster cycle times.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | CNMG120404-HM |
| ANSI Code | CNMG 431 |
| Grade | NC3020 (General CVD Steel Grade) |
| Chipbreaker | HM (Semi-Finishing to Medium Cut) |
Core Performance Benefits:
- Optimized Wear Resistance: The advanced CVD coating is tailored to resist flank wear, ensuring long tool life in continuous steel turning.
- Precision Geometry: The 0.4mm radius allows for fine finishing and precise corner control, ideal for parts with strict tolerance requirements.
- Versatile HM Breaker: Provides stable chip control across various feed rates, preventing chip bird-nesting and workpiece scratching.
- Economic 4-Edge Design: Double-sided negative geometry provides 4 usable edges, significantly reducing your cost-per-part.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (1018/1045) | 180 - 350 m/min | 0.10 - 0.35 mm/rev | 0.5 - 4.0 mm |
| Alloy Steel (4140/SCM440) | 150 - 300 m/min | 0.08 - 0.30 mm/rev | 0.5 - 3.5 mm |
Compatible Tool Holders:
Ensure maximum stability by using standard D-Type or M-Type holders:
- External Turning: PCLNR/L 2020K12 / PCLNR/L 2525M12
- Boring Bars (Internal): S25S-PCLNR12 / S32T-PCLNR12
Steel Grade Selection: NC3020 vs. NC3030
Which Korloy grade is right for your shop?
Higher wear resistance. Best for high-speed continuous cutting and stable setups where efficiency is the priority.
Higher fracture toughness. Best for interrupted cuts, heavy scale, or unstable machines.
Machinist's Tip: If your current insert is wearing out too fast on the flank, upgrade to NC3020 to benefit from its superior abrasive wear resistance.
Packaging: 10 pieces per box.