Korloy TNMG160404-HS PC9030 (TNMG 331-HS) Stainless Steel Finishing Insert (10pcs)
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The Original Korloy TNMG160404-HS PC9030 (ANSI: TNMG 331-HS) is a high-precision PVD Coated Finishing Insert designed specifically for Stainless Steel (M-Group) and High-Temperature Alloys. Featuring the elite PC9030 PVD Grade, it offers exceptional edge sharpness and resistance to built-up edge (BUE). The HS (High-Sharpness) chipbreaker and 0.4mm corner radius are optimized for light depths of cut, delivering a mirror-like surface finish and tight dimensional tolerances on difficult materials.
The Precision Specialist: Stainless steels are prone to work-hardening and adhesion. The HS geometry "slices" through the material rather than rubbing, which is critical for maintaining surface integrity on 304, 316, and surgical-grade stainless steels.
Technical Specifications (Metric & Imperial):
| ISO Designation | TNMG 160404-HS |
| ANSI Designation | TNMG 331-HS |
| 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 (Ultra-Sharp PVD for Stainless) |
Core Performance Benefits:
- Nano-PVD Coating: Extremely thin and smooth TiAlN coating layer ensures the cutting edge remains sharp for precision work.
- Vibration Suppression: The HS geometry reduces radial cutting forces, making it ideal for slender shafts and thin-wall tubes.
- Anti-BUE Technology: Specialized surface treatment prevents stainless steel chips from welding to the rake face.
- Superior Accuracy: The 0.4mm (331) radius allows for detailed contours and sharp corners.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| 300 Series Stainless (304/316) | 120-220 m/min | 0.05-0.18 mm/rev | 0.2-2.0 mm |
| Heat Resistant Alloys | 40-90 m/min | 0.05-0.15 mm/rev | 0.2-1.5 mm |
Compatible Tooling Systems:
- External Finishing Holders: MTJNR 2020K16 / MTJNR 2525M16 (ANSI 12-4B)
- Precision Boring Bars: S25S-WTJNR16 / S20R-WTJNR16
Machinist Tip: Achieving Mirror Finish
Why choosing the HS chipbreaker is critical for Stainless Steel:
Sharpest Edge. When you need a surface finish below Ra 1.6, the HS geometry is essential. It minimizes the "tearing" effect often seen in gummy stainless steels, resulting in a bright, polished look.
Durability Over Sharpness. HM is better for removing scale or roughing. If you use HM for fine finishing, the higher cutting forces may lead to vibration or a duller surface finish compared to HS.
Pro Advice: For finishing stainless, always use a high-concentration coolant (8-10%) and ensure the tool is on center height. Even a 0.1mm deviation from center can ruin the surface finish when using a 0.4mm radius.
Packaging: 10 pieces per box.
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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.