Korloy CNMG120404-HS PC9030 Stainless Steel Finishing Insert (10pcs)
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The Original Korloy CNMG120404-HS PC9030 (ANSI Standard: CNMG 431) is a high-performance PVD-coated carbide insert specifically optimized for precision finishing of Stainless Steel. Featuring the specialized HS chipbreaker, this insert is designed with a sharp rake angle to reduce cutting resistance and minimize the heat that causes work hardening. The PC9030 grade's ultra-smooth coating prevents built-up edge (BUE), ensuring a mirror-like surface finish and exceptional dimensional accuracy on 300-series and 400-series stainless steels.
Finishing Excellence: The HS geometry is much sharper than the HM series, allowing for extremely light depths of cut while maintaining perfect chip breakability.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | CNMG120404-HS |
| ANSI Code | CNMG 431 |
| Grade | PC9030 (Premium PVD for Stainless & HRSA) |
| Chipbreaker | HS (Precision Finishing) |
Core Performance Benefits:
- Superior Surface Quality: The R0.4 nose radius combined with HS geometry minimizes radial cutting forces, preventing chatter and vibration.
- High-Toughness Substrate: Specialized PVD-coated carbide provides the impact resistance needed for small-diameter precision parts.
- Anti-Adhesion Technology: Extremely smooth coating surface prevents "chip welding," which is critical for maintaining tool life in gummy 304/316 stainless.
- Precision Chip Control: Effectively breaks chips even at shallow depths of cut (as low as 0.2mm), protecting the workpiece from scratches.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Stainless Steel (304/316) | 120 - 240 m/min | 0.05 - 0.20 mm/rev | 0.2 - 2.0 mm |
| Heat Resistant Alloys (Inconel) | 30 - 80 m/min | 0.05 - 0.15 mm/rev | 0.2 - 1.5 mm |
Compatible Tool Holders:
For precision finishing, we recommend high-stability D-Type or M-Type holders:
- External Turning: PCLNR/L 2020K12 / PCLNR/L 2525M12 / DCLNR/L 2525M12
- Internal Boring: S25S-PCLNR12 / S32T-PCLNR12
Finishing Pro-Tip: HS vs. HM Chipbreaker
Which geometry is right for your stainless job?
Sharper edge. Best for shallow cuts, high surface finish requirements, and preventing work hardening in delicate parts.
Stronger edge. Best for general-purpose turning where you need a balance between material removal and finish.
Machinist's Tip: If you are experiencing "bird-nesting" chips during fine finishing passes, the HS breaker is the solution to force the chip to curl and break at lower depths of cut.
Packaging: 10 pieces per box.