Korloy DNMG110408-HS PC9030 Stainless Steel Fine Turning Insert, R0.8 (10pcs)
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The Original Korloy DNMG110408-HS PC9030 (ANSI Standard: DNMG 332) is a premium 55° diamond insert engineered for superior chip control in stainless steel finishing. When machining austenitic stainless steels like 304 or 316, standard inserts often produce long, stringy chips that damage surface finish and wrap around the spindle. The HS (High-Sharpness/Finishing) chipbreaker is specifically designed to curl and snap chips at shallow depths of cut. Combined with the PC9030 PVD coating, this insert offers an exceptional balance of edge sharpness and heat resistance.
Stop Bird-Nesting: The HS geometry is your first line of defense against chip tangling in automated CNC production. With an R0.8 radius, it provides more edge security than R0.4 while still delivering the precision needed for final passes.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | DNMG110408-HS |
| ANSI Code | DNMG 332 |
| Grade | PC9030 (Premium PVD for Stainless) |
| Nose Radius | 0.8 mm (Robust Finishing) |
Core Performance Benefits:
- Optimized HS Geometry: Engineered for light depths of cut (ap) where other inserts fail to break the chip.
- PVD Nanostructured Coating: Provides a chemical barrier that prevents the "gummy" stainless steel from welding to the cutting tip.
- Precision R0.8 Edge: Offers a better surface finish at higher feed rates compared to smaller radii, while maintaining high resistance to chipping.
- Lower Cutting Heat: The sharp rake angle reduces friction, minimizing work-hardening on the workpiece surface.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| 300 Series Stainless | 100 - 190 m/min | 0.08 - 0.22 mm/rev | 0.2 - 1.5 mm |
| 400 Series Stainless | 110 - 210 m/min | 0.10 - 0.25 mm/rev | 0.3 - 2.0 mm |
| Heat-Resistant Alloys | 30 - 60 m/min | 0.05 - 0.15 mm/rev | 0.2 - 1.0 mm |
Compatible Tool Holders:
Standard fit for all 55-degree negative 11-size holders:
- External Holders: DDJNR/L 2020K11 / 2525M11
- Internal Boring Bars: S25S-DDUNR11 / S32T-DDUNR11
HS vs. HM: When to Choose?
Both use the premium PC9030 grade, but the chipbreaker changes the application:
Target: Precision Finishing. If you are taking a final "skin cut" and the chips are long and dangerous, HS is the solution. It is sharper and forces a tighter chip curl.
Target: Semi-Finishing to Medium. Best for general turning where you have a bit more depth. It is a more robust edge but might struggle to break chips on very light finishing passes.
Machinist's Pro Tip: Using the HS chipbreaker on a CNC lathe allows for unattended operation on stainless parts, as you won't have to stop the machine to clear away "nesting" chips from the tool post.
Packaging: 10 pieces per box.