Korloy TCMT090204-HMP NC3020 Steel Turning Insert (10pcs)
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The Original Korloy TCMT090204-HMP NC3020 is a highly versatile Triangular Indexable Turning Insert designed for the efficient machining of Carbon Steel, Alloy Steel, and Mild Steel. Utilizing the advanced NC3020 CVD Grade, this insert provides a perfect balance of high hardness and shock resistance. The HMP (Medium-Finishing) Chipbreaker is specifically engineered to handle varying depths of cut, providing excellent chip curling and breakage even at lower feed rates.
Standard for Steel: NC3020 is Korloy's most reliable grade for general steel turning (P20-P35 range). It excels in continuous to light interrupted cuts, making it the "workhorse" for small boring and external turning of everyday steel components.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Designation | TCMT090204-HMP |
| Corner Radius (r) | 0.4 mm |
| Grade | NC3020 (Premium CVD Coating) |
| Application | General Steel, Carbon Steel, Die Steel |
Core Performance Benefits:
- Enhanced Wear Resistance: The multi-layer CVD coating provides a tough thermal barrier, extending tool life in high-temperature cutting zones.
- Superior HMP Geometry: Optimized for medium-to-finishing, the HMP chipbreaker reduces cutting pressure and prevents "chip nesting" on the toolholder.
- Stable Edge Toughness: Specialized substrate resists edge chipping, ensuring consistent surface finishes over long production runs.
- Wide Application Range: Ideal for everything from internal boring of small tubes to general external turning on manual or CNC lathes.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Low Carbon Steel (1018) | 180 - 320 m/min | 0.08 - 0.25 mm/rev | 0.5 - 2.5 mm |
| Alloy Steel (4140/4340) | 150 - 280 m/min | 0.08 - 0.22 mm/rev | 0.4 - 2.0 mm |
| Tool Steel | 100 - 200 m/min | 0.06 - 0.18 mm/rev | 0.3 - 1.5 mm |
Compatible Tooling Systems:
Precision matched for 09-sized triangular holders:
- Internal Boring Bars: S08K-STUCR09 / S10K-STUCR09 / S12M-STUCR09
- External Toolholders: STGCR 1212H09 / STGCR 1616H09
Tech Tip: Choosing Your Steel Grade
Korloy steel grades comparison for TCMT09:
The Universal Choice. Best for a wide range of steels under stable conditions. Offers the best price-to-performance ratio for general job shop work.
For Interrupted Cuts. If you are machining hex bars or parts with holes/keyways, NC3120 provides higher shock resistance to prevent edge breakage.
Pro Advice: For the best surface finish with the HMP chipbreaker, ensure your cutting speed (Vc) is within the recommended range. Running too slow in steel can lead to built-up edge and a duller finish.
Packaging: 10 pieces per box.
Korloy TCMT090204-HMP cutting data, NC3020 grade for steel turning, best boring bar insert for 4140 steel, TCMT 090204 HMP chip control, affordable steel indexable inserts Korloy
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.