Korloy TCMT16T304-HMP NC3020 Steel Turning Insert for Heavy Boring (10pcs)
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The Original Korloy TCMT16T304-HMP NC3020 is a heavy-duty Triangular Indexable Insert built for high-efficiency turning of Carbon Steel, Alloy Steel, and Cast Steel. As a larger 16mm-size insert, it provides the thermal mass and mechanical strength required for larger diameter parts. The NC3020 Grade features a multi-layer CVD coating with a thick Al2O3 layer, providing industry-leading wear resistance at high temperatures, while the HMP Chipbreaker ensures stable chip control in medium-to-finishing operations.
Maximum Productivity for Large Parts: The TCMT16 series is designed for stability. When paired with the NC3020 grade, it allows for high-speed continuous cutting without the risk of rapid plastic deformation, significantly lowering the cost-per-part in mass production.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Designation | TCMT16T304-HMP |
| Corner Radius (r) | 0.4 mm (Precision Finishing) |
| Grade | NC3020 (CVD Coated Steel Grade) |
| Thickness | 3.97 mm |
Core Performance Benefits:
- Superior Thermal Stability: The thick CVD coating protects the carbide substrate from the extreme heat generated during large-diameter steel turning.
- Optimized HMP Chipbreaker: Engineered to eliminate "long chips" by forcing a tight curl, preventing damage to the workpiece surface and machine components.
- High Edge Security: The 16mm edge provides ample contact area and strength for deeper cuts (ap) compared to 09 or 11 sizes.
- Consistent Surface Finish: Maintains Ra values over long production cycles thanks to the specialized substrate that resists crater wear.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (1045) | 180 - 350 m/min | 0.12 - 0.35 mm/rev | 0.5 - 4.0 mm |
| Alloy Steel (4140) | 150 - 300 m/min | 0.10 - 0.30 mm/rev | 0.5 - 3.0 mm |
| Tool Steel | 100 - 200 m/min | 0.10 - 0.25 mm/rev | 0.4 - 2.5 mm |
Compatible Tooling Systems:
Optimized for heavy-duty 16-size triangular toolholders:
- Large Boring Bars: S20R-STUCR16 / S25S-STUCR16 / S32T-STUCR16
- External Turning Tools: STGCR 2020K16 / STGCR 2525M16
Machinist Tip: Scaling Up to TCMT16
Why the 16T304 NC3020 is the backbone of heavy production:
Best for Speed. If you have a powerful, rigid CNC machine, NC3020 allows you to push higher surface footage (Vc). This is your primary grade for 80% of steel-turning applications.
The Interrupted Specialist. Switch to NC3120 for parts with heavy scale, sand inclusions (castings), or large cross-holes that create impact shocks on the cutting edge.
Pro Advice: Because the TCMT16 has a larger surface area, ensure you are using a toolholder with a high-quality seat/shim. Any movement in the insert during heavy steel cutting will lead to premature failure of the CVD coating.
Packaging: 10 pieces per box.
Korloy TCMT16T304-HMP specs, heavy duty steel boring bar inserts, TCMT 16T304 NC3020 cutting data, best insert for large alloy steel parts, industrial steel turning solutions 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.