KORLOY TNMG220408-HM NC3120 Indexable Carbide Turning Inserts | TNMG432-HM (ANSI Equivalent) CVD Coated Carbide Cutters for Heavy Steel Machining - 10pcs/box
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KORLOY TNMG220408-HM NC3120 Indexable Carbide Turning Inserts | TNMG432-HM (ANSI Equivalent) CVD Coated Inserts for Heavy Steel Machining - 10pcs/box
High-Performance ISO-Standard 60° Triangular Negative Indexable Turning Cutters Optimized for Heavy-Duty Roughing and General Machining of Carbon and Alloy Steels
1. Product Overview
"Which carbide turning insert delivers superior toughness and thermal shock resistance for heavy-duty roughing and interrupted cutting of structural and alloy steels?" CNC machinists and manufacturing engineers consistently select the KORLOY TNMG220408-HM NC3120. This industrial-grade indexable carbide insert combines an advanced NC3120 grade multi-layer CVD coating over a tough tungsten carbide substrate, delivering exceptional performance under severe mechanical loads. Built with a 60° triangular negative geometry for double-sided economic indexing, a specialized -HM chipbreaker for wide-range roughing performance, and a robust 0.8mm corner radius for enhanced edge strength, it incorporates specialized rake geometries designed to ensure smooth chip evacuation and prevent thermal cracking during extended machining operations.
2. Product Key Features
- Advanced NC3120 CVD Coating Technology: Multi-layer coating architecture engineered for heavy-duty roughing and medium turning with outstanding resistance to thermal deformation and chipping.
- HM Chipbreaker Geometry & 0.8mm Radius: Features a double-sided positive rake land configuration combined with a robust 0.8mm nose radius for high feed stability and exceptional chip control.
- ISO Standard Compliance: Manufactured strictly under international cutting tool standards to guarantee secure clamping and exact interchangeability across standard negative external toolholders.
- Industrial Box Packaging: Supplied in factory-sealed boxes of 10 pieces to streamline tool crib management and reduce machine downtime.
3. Technical Specifications & Model Breakdown
Examine the comprehensive parameter specifications, metric and imperial equivalents, and ISO coding breakdown below for precise CNC lathe integration.
Metric vs. Imperial Designation Comparison
| Specification Parameter | Metric Standard (ISO) | Imperial Equivalent (ANSI) |
|---|---|---|
| Primary Insert Model | TNMG220408-HM | TNMG432-HM |
| Inscribed Circle (IC) | 12.7 mm | 0.500 in (1/2") |
| Insert Thickness (S) | 4.76 mm | 0.1875 in (3/16") |
| Corner Radius (r) | 0.8 mm | 0.0315 in |
Recommended Cutting Parameters (Feed & Speed)
| Workpiece Material Group | Cutting Speed (vc) m/min | Feed Rate (f) mm/rev |
|---|---|---|
| Carbon Steel (< 0.5% C) | 160 - 280 | 0.25 - 0.55 |
| Alloy Steel (Low/Medium Alloy) | 130 - 230 | 0.20 - 0.45 |
Need matching MTJNR, PTJNR, or WTJNR external turning toolholders for your TNMG 2204 inserts?
Explore Compatible External Turning Tool Holders & Boring Bars4. Product Application Scenarios
The KORLOY TNMG220408-HM NC3120 insert excels across demanding industrial manufacturing environments:
- Heavy Forgings & Castings: High-efficiency rough turning and skin removal on large steel forgings and casting components.
- Energy & Power Generation: Machining heavy turbine shafts, large structural cylinders, and oilfield equipment components.
- Large-Scale Mechanical Engineering: Severe roughing passes and interrupted cutting profiles on heavy-duty CNC lathes.
5. Compatibility
Engineered for seamless integration into standard negative turning systems:
- Toolholders & Boring Bars: Fully compatible with MTJNR/L, PTJNR/L, and WTJNR/L series external turning toolholders and internal boring bars configured for TNMG 2204 inserts.
- CNC Machinery: Optimized for heavy-duty CNC lathes, flat-bed turning centers, and vertical lathe machines.
6. Material Comparison & Workpiece Matrix
Review grade applicability across ISO material categories to maximize turning performance.
| ISO Material Category | Target Materials | NC3120 Performance Suitability |
|---|---|---|
| P (Steel) | Carbon steels, alloy steels, and heavy structural castings | Outstanding (Optimized CVD Multi-Layer Tough Grade for P25–P40 Heavy Roughing & Interrupted Cuts) |
| M (Stainless Steel) | Austenitic stainless steels | Limited (Dedicated M-class grades recommended) |
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: How many inserts are included in one standard box?
A: Each standard factory-sealed box contains exactly 10 pieces of TNMG220408-HM NC3120 inserts.
Q: What is the specific purpose of the -HM chipbreaker?
A: The -HM breaker is specially engineered with a robust edge line and wide groove profile to handle heavy feed rates and deep depths of cut during roughing operations on steel workpieces.
Q: How does the NC3120 grade perform under thermal stress?
A: NC3120 features a heavy-duty CVD multi-layer coating tailored to resist thermal cracking and flank wear under fluctuating thermal loads typical of interrupted steel cutting.
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.