Korloy CNMG120408-GS PC9030 Stainless Steel Semi-Finishing Insert (10pcs)
30-Day Free Returns
Free Worldwide Shipping
The Original Korloy CNMG120408-GS PC9030 (ANSI Standard: CNMG 432) is a premier PVD-coated carbide insert specifically engineered for the semi-finishing of Stainless Steel (M-class). The GS (General Semi-finishing) chipbreaker is designed to bridge the gap between heavy roughing and fine finishing. It offers a more robust cutting edge than the HS series while providing significantly better chip control than standard roughing geometries. Paired with the world-class PC9030 grade, this insert is the industry standard for machining 304, 316, and Duplex stainless steel.
High-Efficiency Semi-Finishing: The GS geometry features a balanced rake angle that reduces cutting heat and prevents "built-up edge" (BUE), ensuring consistent surface quality and dimensional accuracy in production environments.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | CNMG120408-GS |
| ANSI Code | CNMG 432 |
| Grade | PC9030 (Advanced PVD for Stainless Steel) |
| Nose Radius | 0.8 mm (1/32") - High Strength |
Core Performance Benefits:
- Optimized for Gummy Materials: Specialized PVD coating prevents chips from welding to the edge, a common issue with 300-series stainless.
- Stable Chip Evacuation: The GS breaker ensures chips are broken into short, manageable C-shapes even at medium feed rates.
- Thermal Shock Resistance: The PC9030 grade is highly resistant to the thermal cracking caused by the rapid heating and cooling of wet-cut stainless steel.
- Robust 0.8mm Radius: Provides the structural integrity needed to handle slight variations in material hardness or scale.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Austenitic (304/316) | 100 - 200 m/min | 0.12 - 0.35 mm/rev | 0.8 - 4.0 mm |
| Duplex Stainless (2205) | 60 - 130 m/min | 0.10 - 0.30 mm/rev | 0.8 - 3.5 mm |
Compatible Tool Holders:
For maximum stability in stainless steel turning, we recommend using rigid D-Type or M-Type holders:
- External Turning: PCLNR/L 2020K12 / PCLNR/L 2525M12 / DCLNR/L 2525M12
- Internal Boring Bars: S32T-PCLNR12 / S40T-PCLNR12
Machinist's Guide: GS vs. HM Chipbreaker
Which geometry fits your stainless steel application?
Sharper cutting edge. Best for medium cuts where surface finish and dimensional tolerance are the priority.
Stronger cutting edge. Best for removing larger amounts of material and handling unstable casting surfaces.
Pro Tip: When using the GS breaker on 316 stainless, if you notice long ribbon-like chips, increase your feed rate slightly to force the chip into the breaker's groove.
Packaging: 10 pieces per box.