Korloy SP400 NC3120 4mm Single-Ended Universal Steel Parting Insert (10pcs)
30-Day Free Returns
Free Worldwide Shipping
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.
Korloy SP400 NC3120 original inserts, 4mm steel parting tool for heavy industrial, NC3120 cutting speed for alloy steel, SP400 vs NC3020 for deep grooving, heavy duty 4mm parting off CNC parameter