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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