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.
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