Korloy TCMT16T304-HMP NC3120 Universal Steel Turning Insert (10pcs)
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The Original Korloy TCMT16T304-HMP NC3120 is a high-performance Triangular Indexable Insert engineered for the widest range of Steel Turning applications. By utilizing the NC3120 "Universal" CVD Grade, this insert offers a balanced solution that resists both wear and chipping. The HMP (Medium-Finishing) Chipbreaker features a sharp cutting edge and an optimized rake angle, making it the perfect choice for shops that need one insert to handle multiple steel types and cutting conditions.
The All-Rounder: NC3120 is designed to be the most versatile steel grade in your toolbox. It performs exceptionally well in continuous cuts like its sibling NC3020, but with the added toughness to survive the light interruptions that often occur in general job shop environments.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Designation | TCMT16T304-HMP |
| Corner Radius (r) | 0.4 mm |
| Grade | NC3120 (Universal CVD Steel Grade) |
| Insert Side Length | 16.5 mm |
Core Performance Benefits:
- Broad Application Range: One insert for various carbon and alloy steels (P15 - P35), reducing inventory costs.
- Optimized CVD Coating: Features high adhesion resistance and thermal stability for consistent tool life even at increased speeds.
- Excellent Surface Finish: The HMP geometry minimizes cutting pressure, delivering a superior finish on large-diameter workpieces.
- Stability in Large Boring: The 16mm size provides the rigidity needed for deep internal boring operations.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Low Carbon Steel (1018/1045) | 180 - 320 m/min | 0.10 - 0.30 mm/rev | 0.5 - 3.5 mm |
| Alloy Steel (4140/5140) | 150 - 280 m/min | 0.10 - 0.25 mm/rev | 0.5 - 2.5 mm |
| Mild Steel (General A36) | 200 - 350 m/min | 0.12 - 0.35 mm/rev | 0.8 - 4.0 mm |
Compatible Tooling Systems:
Pairs with heavy-duty 16-size triangular toolholders:
- External Turning Toolholders: STGCR 2020K16 / STGCR 2525M16
- Internal Boring Bars: S25S-STUCR16 / S32T-STUCR16
Machinist Tip: The "Swiss Army Knife" of Inserts
How NC3120 fits into your production cycle:
The Goldilocks Grade. Not too hard, not too soft. Use this when your daily work varies between smooth shafts and slightly rough or square stock. It’s the most forgiving grade for general machining.
The Specialists. Choose NC3020 for strictly high-speed, continuous CNC work. Choose NC3030 only for heavy impact, interrupted cuts, or very poor machine rigidity.
Pro Advice: For large-diameter boring with the 16mm TCMT, always ensure your chipbreaker is clear. The HMP geometry is great, but in deep holes, high-pressure coolant is your best friend to prevent chip re-cutting.
Packaging: 10 pieces per box.
Korloy TCMT16T304-HMP performance, NC3120 vs NC3020 for carbon steel, best all-around turning insert for steel, large boring bar inserts for multi-purpose steel machining, TCMT16T304 feed and speed for 4140
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.