Korloy TNMG160404-HA PC9030 (TNMG 331-HA) Sharp Insert for Stainless Steel (10pcs)
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The Original Korloy TNMG160404-HA PC9030 (ANSI: TNMG 331-HA) is a specialized Triangular Turning Insert designed for the most challenging Gummy Stainless Steels and High-Temperature Alloys. By combining the HA Sharp-Edge Geometry (traditionally for aluminum) with the PC9030 PVD Coating, Korloy has created a tool that provides an incredibly clean shear cut while resisting the extreme heat of stainless machining. This is the top choice for preventing burrs and vibration on slender or soft-alloy parts.
The Burrs-Killer: If you are struggling with "smearing" or heavy burrs on 304/316L stainless steel, the HA geometry is your solution. Its high positive rake angle slices through material with minimal pressure, ensuring high precision and a mirror-like finish even on difficult alloys.
Technical Specifications (Metric & Imperial):
| ISO Designation | TNMG 160404-HA |
| ANSI Designation | TNMG 331-HA |
| Inscribed Circle (IC) | 9.525 mm / (3/8") |
| Thickness (S) | 4.76 mm / (3/16") |
| Corner Radius (r) | 0.4 mm / (1/64") |
| Grade | PC9030 (PVD Coated for Stainless/Superalloys) |
Core Performance Benefits:
- Ultra-Sharp Edge: Minimizes cutting forces, making it perfect for long-overhang boring bars and thin-walled workpieces.
- PVD Coated Protection: The PC9030 layer prevents the "notching" and chemical wear typically seen when using uncoated tools on stainless.
- Vibration Reduction: Sharp geometry "bites" into the material immediately, preventing the tool from rubbing and causing chatter.
- Premium Surface Finish: Eliminates the "tearing" effect on soft stainless, leaving a clean, high-precision surface.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Soft Stainless (304L/316L) | 100-180 m/min (330-590 sfm) | 0.05-0.18 mm/rev (.002-.007 ipr) | 0.2-2.0 mm (.008-.079") |
| Nickel Alloys (Inconel) | 25-60 m/min (80-195 sfm) | 0.05-0.15 mm/rev (.002-.006 ipr) | 0.2-1.5 mm (.008-.059") |
Compatible Tooling Systems:
- External Precision Holders: MTJNR 2020K16 / MTJNR 2525M16 (ANSI 12-4B / 16-4D)
- Precision Boring Bars: S20R-WTJNR16 / S25S-WTJNR16
Machinist Tip: When to choose the HA-PC9030?
Optimizing for difficult-to-cut materials:
The Finishing Specialist. This combination is very sharp. Use it for final passes where surface finish and dimensional accuracy are paramount. It is far superior to standard GS or MS geometries for eliminating burrs on small parts.
The GS geometry is a multi-purpose workhorse for medium cutting. However, if your machine lacks rigidity or if your material is exceptionally gummy, the HA geometry will cut much more freely, although the edge is slightly more delicate.
Pro Advice: Because the HA edge is extremely sharp, avoid using it for heavy roughing or interrupted cuts. It is a precision instrument designed for finishing and semi-finishing under stable conditions.
Packaging: 10 pieces per box.
TNMG 160404-HA for stainless steel, Korloy PC9030 sharp geometry inserts, best insert to prevent burrs on 316 stainless, TNMG 331-HA PVD coated for Inconel, sharpest TNMG insert for small diameter stainless
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.