Korloy CCMT120404-HMP NC3120 Universal Steel Finishing Insert (10pcs)
30-Day Free Returns
Free Worldwide Shipping
The Original Korloy CCMT120404-HMP NC3120 is the premier "All-Rounder" solution for medium-to-large steel turning applications. As a balanced grade, NC3120 provides the ideal mix of wear resistance and impact toughness. This size-12 insert is specifically designed for stability during finishing passes, offering superior heat management and edge security compared to smaller alternatives.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | CCMT120404-HMP |
| Grade | NC3120 (Universal Balance Grade) |
| Nose Radius | 0.4 mm (Precision Finishing) |
| Chipbreaker | HMP (Versatile Medium Duty) |
Core Performance Benefits:
- Exceptional Versatility: NC3120 grade reduces tool inventory by performing reliably across both continuous and light interrupted steel turning.
- Size-12 Stability: The thicker substrate (4.76mm) absorbs more cutting vibration and heat, making it perfect for larger workpiece diameters.
- Superior Surface Finish: The R0.4 radius provides the precision needed for final finishing passes while the HMP geometry ensures excellent chip evacuation.
- Extended Tool Life: Advanced CVD coating technology provides a high-performance thermal barrier, maintaining edge sharpness during high-speed machining.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (HB180-280) | 150 - 320 m/min | 0.10 - 0.25 mm/rev | 0.5 - 3.0 mm |
| Alloy Steel (HB280-350) | 120 - 250 m/min | 0.08 - 0.20 mm/rev | 0.5 - 2.5 mm |
Compatible Tool Holders:
To ensure maximum rigidity for this large insert, pair with standard SCLCR/L type holders (Size 12):
- External Turning: SCLCR1616H12 / SCLCR2020K12 / SCLCR2525M12
- Boring Bars (Internal): S16Q-SCLCR12 / S20R-SCLCR12 / S25S-SCLCR12
Quick Guide: Korloy Steel Grade Selection
Which NC grade is right for your job?
Best for high-speed continuous cutting in very stable conditions.
The universal standard. Reliable across most steel alloys and conditions.
Best for heavy interrupted cuts and shaky/unstable machine setups.
Machinist's Tip: Using the CCMT12 size instead of CCMT09 on larger diameters significantly reduces the risk of vibration marks (chatter).
Packaging: 10 pieces per box.