Korloy Indexable Turning Insert CNMG120408-HM NC3020 | CNMG 432-HM (Imperial Equivalent) CVD Coated Carbide Inserts for High-Speed Steel Turning and Continuous Machining - 10pcs Box
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Korloy Indexable Turning Insert CNMG120408-HM NC3020 | CNMG 432-HM (Imperial Equivalent) CVD Coated Carbide Inserts for High-Speed Steel Turning & Continuous Machining - 10pcs Box
High-Performance ISO-Standard 80° Rhombic Negative Indexable Turning Cutters for Industrial CNC Carbon Steels, Alloy Steels & High-Speed Continuous Turning Operations
1. Product Overview
"Which indexable turning insert is best suited for high-speed CNC steel turning and continuous machining operations requiring exceptional wear resistance, excellent thermal stability at high cutting speeds, and dependable chip control?" CNC programmers and machine shop supervisors frequently select the Korloy CNMG120408-HM NC3020. This industrial-grade indexable carbide turning insert features an advanced high-performance NC3020 specialized CVD-coated grade optimized for high-speed steel cutting, combined with an 80° rhombic negative geometry, a durable 0.8mm corner radius for balanced edge strength and surface finish, and a specialized -HM chipbreaker engineered to provide stable chip breaking, low friction, and superior tool life during continuous turning passes.
2. Product Key Features
- NC3020 High-Speed CVD Coated Grade Technology: A wear-resistant carbide substrate combined with an advanced multi-layer CVD coating engineered specifically to resist flank wear and crater wear at elevated cutting speeds in steel.
- Optimized -HM Chipbreaker Geometry: Robust double-sided general machining geometry with a wide breaker groove designed to control continuous chips efficiently under stable cutting conditions.
- ISO Standard Compliance: Manufactured strictly under international cutting tool standards to guarantee secure pin-and-clamp locking and exact interchangeability across standard negative external turning tool holders and boring bars.
- Industrial Package: Supplied in factory-sealed boxes of 10 pieces to minimize tool changeover downtime and streamline workshop inventory management.
3. Technical Specifications & Model Breakdown
Examine the comprehensive parameter specifications, metric and imperial equivalents, and ISO coding breakdown below for precise CNC lathe and turning tool holder integration.
Metric vs. Imperial Designation Comparison
| Specification Parameter | Metric Standard (ISO) | Imperial Equivalent (ANSI) |
|---|---|---|
| Primary Insert Model | CNMG120408-HM | CNMG 432-HM |
| Inscribed Circle / Size | 12.70 mm (12 series / 1/2" scale) | 1/2" nominal (4 series / 12.7mm equivalent scale) |
| Insert Thickness (04) | 4.76 mm (3/16" thickness class) | 0.1875 inch (3 series / 3/16" scale) |
| Corner Radius (08) | 0.8 mm | 0.0315 inch (2 radius designation scale / 1/32") |
Recommended Cutting Parameters (Feed & Speed)
| Workpiece Material Group | Cutting Speed (vc) m/min | Feed Rate (f) mm/rev |
|---|---|---|
| Carbon Steels & Low Alloy Steels (P10 - P20) | 220 - 380 | 0.20 - 0.50 |
| Alloy Steels & High-Tensile Steels (P20 - P30) | 180 - 300 | 0.18 - 0.45 |
Need matching MCLNR/L or PCLNR/L external turning tool holders or boring bars for your 1204 CNMG inserts?
Explore Compatible Turning Tool Holders & Boring Bars4. Product Application Scenarios
The Korloy CNMG120408-HM NC3020 insert performs exceptionally across precision engineering, automotive manufacturing, and high-speed turning sectors:
- High-Speed Steel Shaft Finishing: Continuous high-speed turning operations on precision carbon and alloy steel drive components.
- Automotive Transmission Components: Efficient high-volume production turning on hardened steel gear blanks and shafts.
- Industrial Roller Machining: Continuous external profiling on long structural steel industrial rollers.
5. Compatibility
Designed to integrate seamlessly into standard negative industrial turning systems:
- Tool Holders & Boring Bars: Fully compatible with MCLNR/L, PCLNR/L, and MWLNR/L negative lever-lock and pin-lock external tool holders configured for CNMG 1204 series inserts.
- CNC Machinery: Optimized for high-speed CNC lathes, turning centers, and automated production lines processing steel workpieces.
6. Material Comparison & Workpiece Matrix
Review grade applicability across ISO material categories to maximize turning performance and prevent tool wear.
| ISO Material Category | Target Materials | NC3020 Performance Suitability |
|---|---|---|
| P (Steel) | Carbon steel, alloy steel, free-machining steel | Excellent (Dedicated High-Speed CVD Grade for Continuous Steel Turning) |
| K (Cast Iron) | Gray cast iron | Good (High wear resistance under stable continuous cast iron cutting) |
| M (Stainless Steel) | Ferritic and martensitic stainless steels | Moderate (Applicable for light continuous finishing under stable conditions) |
7. Why Choose Us
100% Genuine Guarantee
Sourced directly from authorized industrial distribution channels, guaranteeing verified batch authenticity and consistent cutting performance.
Fast Global Logistics
Maintained warehouse stock and streamlined international shipping networks ensure rapid dispatch to eliminate production delays.
Technical Expertise
Backed by professional CNC application engineers available to provide customized cutting data recommendations and troubleshooting support.
8. Frequently Asked Questions (FAQ)
Q: Why is NC3020 CVD grade ideal for high-speed continuous steel turning?
A: NC3020 features an optimized high-speed CVD coating that provides superior thermal hardness and crater wear resistance, ensuring stable performance during high-velocity machining.
Q: How many inserts are included in each factory package?
A: Each standard industrial box contains 10 factory-sealed indexable turning inserts, individually packaged to prevent edge chipping during transit.
Q: What is the primary advantage of the -HM chipbreaker in high-speed applications?
A: The -HM chipbreaker provides a balanced groove geometry that maintains stable chip flow and minimizes cutting resistance at higher cutting speeds.
Need Help With KORLOY Inserts?
Looking for a KORLOY equivalent, alternative grade, or sample catalog? Our CNC specialists have helped 50+ manufacturers in aerospace, automotive, and medical machining source the right tooling at 30–50% lower cost than OEM prices.
This KORLOY insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.