Korloy SP300 NC3120 3mm Single-Ended Universal Parting Insert (10pcs)
30-Day Free Returns
Free Worldwide Shipping
The Original Korloy SP300 NC3120 is the premier 3.0mm Single-Ended Universal Parting and Grooving Insert. Designed to handle the widest variety of Steel (P-Group) materials, the NC3120 Universal Grade features a cutting-edge CVD coating that bridges the gap between high productivity and rugged durability. The 3mm single-ended design provides superior stability for deep radial cuts, making it the most versatile tool in any CNC machine shop's arsenal.
The Shop Standard: NC3120 is engineered for those who want one grade that can do it all. It offers the toughness needed for slight interruptions and the wear resistance required for medium-to-high speed continuous parting.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| Insert Style | Single-Ended (High Stability) |
| Cutting Width (W) | 3.0 mm (+/- 0.1mm) |
| Grade | NC3120 (General Purpose Steel Grade) |
| Coating Type | Advanced CVD (TiCN + Al2O3 + TiN) |
Core Performance Benefits:
- Versatile Performance: Excellent for Carbon Steels, Alloy Steels, and Low-Carbon Mild Steels.
- Balanced Tool Life: Prevents both rapid flank wear and unexpected edge chipping, ensuring predictable replacement cycles.
- Deep Parting Capability: The single-ended shank provides the massive clamping area needed for large-diameter solid bar parting.
- Superior Surface Finish: The SP-style chipbreaker controls the 3mm wide chip, keeping it away from the finished walls of the groove.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) |
|---|---|---|
| Mild Steel / Low Carbon | 120 - 210 m/min | 0.08 - 0.20 mm/rev |
| Medium Carbon Steel (1045) | 100 - 180 m/min | 0.07 - 0.18 mm/rev |
| Alloy Steel (4140/SCM440) | 80 - 150 m/min | 0.05 - 0.15 mm/rev |
Compatible Tool Holders:
Ensure maximum system rigidity with these professional holders:
- High-Rigidity Blades: SPB 26-3 / SPB 32-3
- Blade Blocks: SMBB 2026 / 2532 Series
- Shank Tool Holders: NCIH 20-3 / NCIH 25-3
Machinist Tip: The "Grade Selection" Guide
Korloy SP-Series Grade Hierarchy for Steel:
The Safe Choice. Your first option for general steel work. It balances speed and toughness so you don't have to switch inserts between different jobs.
For High Production. Best for clean, round bars on stable machines where you want to maximize RPM and minimize cycle time.
For Broken Cuts. Use this when parting hex bars or when the machine is old and vibrating. It prevents the insert from snapping.
Pro Advice: When parting with the SP300 NC3120, always aim for a center height of +/- 0.05mm. Being off-center is the #1 cause of insert failure in 3mm parting operations.
Packaging: 10 pieces per box.
Korloy SP300 NC3120 original price, 3mm steel parting tool for general purpose, NC3120 cutting data for alloy steel, SP300 vs NC3020 for steel grooving, best 3mm insert for medium speed parting