Korloy DNMG110404-HS PC9030 Stainless Steel Super-Finishing Insert (10pcs)
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The Original Korloy DNMG110404-HS PC9030 (ANSI Standard: DNMG 331) is a specialized 55° diamond insert engineered for super-precision finishing of Stainless Steel (M). While many inserts struggle with long, tangled chips during fine finishing, the HS chipbreaker is designed to break chips perfectly at extremely low feed rates and shallow depths. Combined with the high-performance PC9030 PVD grade, this insert ensures a mirror-like surface finish and exceptional dimensional stability on difficult-to-machine alloys.
The Finishing Specialist: If you are experiencing "bird-nesting" chips during your final pass on 304 or 316 stainless steel, the HS geometry is the solution. It is specifically shaped to provide sharp cutting action with minimal tool pressure.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | DNMG110404-HS |
| ANSI Code | DNMG 331 |
| Grade | PC9030 (Premium PVD for Stainless) |
| Nose Radius | 0.4 mm (Super-Fine Finishing) |
Core Performance Benefits:
- HS Fine-Finishing Geometry: Unique chipbreaker design that forces chip breaking even when the depth of cut is less than 0.5mm.
- Nano-Structured PVD Coating: PC9030 offers an incredibly smooth surface that prevents workpiece material from welding to the tip.
- Reduced Cutting Forces: Sharp cutting edge minimizes heat generation and prevents vibration on slender or thin-walled workpieces.
- Superior Accuracy: High edge sharpness ensures tight tolerances are maintained over long production runs.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Stainless 304 / 316 | 120 - 220 m/min | 0.03 - 0.12 mm/rev | 0.1 - 1.2 mm |
| Exotic Alloys (Ti / Inconel) | 40 - 80 m/min | 0.04 - 0.10 mm/rev | 0.1 - 0.8 mm |
| Mild Stainless (400 Series) | 130 - 240 m/min | 0.05 - 0.15 mm/rev | 0.2 - 1.5 mm |
Compatible Tool Holders:
Fits all standard 55-degree negative 11-size holders:
- External Precision Holders: DDJNR/L 1616H11 / 2020K11 / 2525M11
- Internal Boring Bars: S20R-DDUNR11 / S25S-DDUNR11 / S32T-DDUNR11
Chipbreaker Intelligence: HS vs. HM
When should you choose the HS geometry for your stainless job?
Best for Precision Passes. Use this when your depth of cut is very shallow and you need to break chips to avoid damaging the surface finish.
The Universal Choice. Use HM for general steel and stainless turning where the feed rate is higher. It won't break chips as effectively as HS at extremely light feeds.
Machinist's Pro Tip: For stainless steel finishing, if the chip looks like a long continuous wire, don't increase the feed—switch to the HS chipbreaker. It's designed to curl and snap those "wire" chips safely.
Packaging: 10 pieces per box.