Korloy CNMG120408-GS PC9030 Stainless Steel Semi-Finishing Insert (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
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.
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.