Korloy SP400 NC3120 4mm Single-Ended Universal Steel Parting Insert (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
The Original Korloy SP400 NC3120 is a heavy-duty 4.0mm Single-Ended Parting and Grooving Insert engineered for maximum versatility. The NC3120 Universal Grade is specifically designed to handle a wide range of Steel (P-Group) applications, providing a stable cutting edge that excels in both continuous and slightly interrupted cuts. With its 4mm width, this insert offers the structural integrity needed for deep radial plunging where thinner inserts might deflect or chatter.
The Heavy-Duty All-Rounder: NC3120 is the go-to grade for machine shops looking to consolidate their inventory. It provides sufficient heat resistance for medium-speed production while maintaining the toughness required to survive forging skins and minor interruptions on 4mm wide cuts.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| Insert Style | Single-Ended (Heavy Duty Design) |
| Cutting Width (W) | 4.0 mm (+/- 0.1mm) |
| Grade | NC3120 (General Purpose Steel Grade) |
| Material Group | Carbon Steel, Alloy Steel, Tool Steel |
Core Performance Benefits:
- Enhanced Rigidity: The 4.0mm profile is ideal for large diameter parting off and roughing out wide grooves in one pass.
- Predictable Tool Life: NC3120 technology prevents sudden edge failure, allowing for consistent lights-out manufacturing.
- Optimized CVD Coating: A balanced TiCN + Al2O3 layer protects against crater wear while maintaining a sharp, efficient cutting edge.
- Superior Chip Evacuation: The SP-style chipbreaker curls thick 4mm chips into a narrow "C" shape, ensuring they don't jam in deep slots.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) |
|---|---|---|
| Mild Steel (Low Carbon) | 110 - 200 m/min | 0.10 - 0.22 mm/rev |
| Medium Carbon Steel (1045) | 90 - 170 m/min | 0.08 - 0.20 mm/rev |
| Alloy Steel (4140/SCM440) | 70 - 140 m/min | 0.06 - 0.18 mm/rev |
Compatible Tool Holders:
Ensure maximum stability by pairing with these heavy-duty systems:
- Parting Blades: SPB 26-4 / SPB 32-4
- Blade Blocks: SMBB 2532 / 3232 Series
- Integrated Shank Tools: NCIH 25-4 / NCIH 32-4
Machinist Tip: Why choose SP400 NC3120?
Korloy SP-Series Grade Comparison for Heavy Duty Work:
The Safe Bet. If your shop processes a mix of 1018, 1045, and 4140 steel, NC3120 is the best 4.0mm choice to ensure you don't have to stop and change inserts for every material.
High Speed. Best for clean, round bar stocks on high-precision CNCs where speed is the primary goal.
Extreme Shock. Best for very heavy interruptions, large hex bars, or older machines with significant vibration issues.
Pro Advice: When parting off large diameters with SP400, consider reducing the feed rate by 30% once you reach the core (last 5-10mm) to ensure a clean break-off and prolong the life of your NC3120 edge.
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.