Korloy SP300 NC3020 3mm Single-Ended Parting & Grooving Insert (10pcs)
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The Original Korloy SP300 NC3020 is a high-performance 3.0mm Single-Ended Parting and Grooving Insert. Engineered for Steel (P-Group) machining, the NC3020 CVD Grade features a robust TiCN + Al2O3 coating that provides an exceptional thermal barrier during high-speed operations. The 3mm width is the industry standard for parting off solid bars and heavy-duty grooving, offering the ideal balance between edge strength and material conservation.
Maximum Depth & Stability: The single-ended SP300 design provides a longer, more rigid seating area in the tool holder. This eliminates the vibration common in double-ended inserts when plunging deep into solid workpieces, ensuring a flatter cut and better surface finish.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| Insert Style | Single-Ended (Deep Cut Specialist) |
| Cutting Width (W) | 3.0 mm (+/- 0.1mm) |
| Grade | NC3020 (CVD Coated for High-Speed Steel) |
| Main Application | Carbon Steel, Alloy Steel, Tool Steel |
Core Performance Benefits:
- High-Speed Wear Resistance: NC3020 is designed to stay sharp at higher RPMs, reducing cycle times in mass production.
- Rugged Edge Construction: The 3.0mm width provides high fracture resistance even when encountering slightly interrupted surfaces.
- Efficient Chip Evacuation: The top-face chipbreaker geometry forces chips to narrow and curl, preventing them from jamming in deep, narrow grooves.
- Extended Tool Life: Thick Al2O3 CVD layer protects the carbide substrate from crater wear and plastic deformation.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) |
|---|---|---|
| Low Carbon Steel (1020) | 140 - 240 m/min | 0.08 - 0.22 mm/rev |
| Medium Carbon Steel (1045) | 120 - 200 m/min | 0.07 - 0.20 mm/rev |
| Alloy Steel (4140/8620) | 90 - 170 m/min | 0.05 - 0.18 mm/rev |
Compatible Tool Holders:
Precision fit for Korloy SP-System and universal parting blocks:
- Standard Parting Blades: SPB 26-3 / SPB 32-3
- Blade Blocks: SMBB 2026 / 2532 Series
Machinist Tip: Why Single-Ended SP300?
Choosing between SP series and MGMN (double-ended) systems:
The Parting Specialist. Use SP300 for cutting off solid bars and very deep grooves. Because it only has one head, the entire back of the insert acts as a stabilizer, preventing the "vibration chatter" that can ruin surface finish in deep cuts.
The Profiling Specialist. Best for general grooving and side-turning. While it offers two edges for economy, it is limited in depth because the secondary edge can collide with the workpiece during deep plunging.
Pro Advice: When parting to center, reduce the feed rate by 50% for the final 2mm of the radius. This ensures a clean break and prevents the SP300 from chipping as the surface speed ($V_c$) drops to zero at the spindle center.
Packaging: 10 pieces per box.
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