Korloy CNMG120404-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 CNMG120404-GS PC9030 (ANSI Standard: CNMG 431) is a high-performance PVD-coated carbide insert specifically optimized for the semi-finishing of Stainless Steel (M-class). The GS chipbreaker is the middle-ground expert: it offers sharper cutting than roughing geometries to prevent work hardening, yet remains robust enough to handle moderate variations in depth of cut. Combined with the legendary PC9030 grade, this insert provides exceptional resistance to built-up edge (BUE) and thermal cracking in materials like 304, 316, and Duplex stainless.
Precision & Control: The GS geometry is specifically designed to provide stable chip evacuation across a broad range of medium cutting conditions, making it a highly reliable "set-and-forget" choice for CNC production.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | CNMG120404-GS |
| ANSI Code | CNMG 431 |
| Grade | PC9030 (Premium PVD for Stainless Steel) |
| Chipbreaker | GS (General Semi-finishing) |
Core Performance Benefits:
- Excellent Surface Integrity: The R0.4 nose radius reduces radial pressure, ensuring tight tolerances and minimal vibration on smaller workpieces.
- Anti-Adhesion PVD Coating: Specialized PC9030 coating chemistry prevents gummy stainless steel chips from welding to the insert edge.
- Optimized Chip Breaking: The GS breaker ensures chips are curled and broken efficiently even at fluctuating depths of cut (ap).
- Reduced Work Hardening: Sharp shearing geometry ensures the tool cuts through the material rather than rubbing it, preserving part quality.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Austenitic (304/316) | 110 - 220 m/min | 0.08 - 0.25 mm/rev | 0.4 - 3.0 mm |
| Duplex Stainless (2205) | 70 - 130 m/min | 0.06 - 0.20 mm/rev | 0.4 - 2.5 mm |
Compatible Tool Holders:
For precision semi-finishing, we recommend rigid D-Type or M-Type holders:
- External Turning: PCLNR/L 2020K12 / PCLNR/L 2525M12
- Internal Boring Bars: S25S-PCLNR12 / S32T-PCLNR12
Application Tip: GS vs. HS Chipbreaker
Choosing the right geometry for your stainless project:
A balanced "all-rounder" for semi-finishing. Stronger than HS, making it better for parts with slight diameter variations.
Much sharper. Use this specifically for very light finishing passes where preventing heat and work hardening is the absolute priority.
Machinist's Advice: When using the GS breaker on CNC lathes, ensure consistent coolant delivery to the cutting edge to maximize the life of the PC9030 coating.
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.