ZCC.CT SCMT09T304-HM YBM251 Carbide Turning Inserts for Stainless Steel
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ZCC.CT SCMT09T304-HM YBM251 Turning Insert
Professional CVD Grade for Semi-Finishing to Medium Stainless Steel Turning
Product Overview
The ZCC.CT SCMT09T304-HM in the YBM251 grade is a high-efficiency 90° square insert engineered for the demanding world of ISO M (Stainless Steel) machining. The YBM251 grade features a thick CVD coating combined with a specialized substrate that offers a perfect balance of wear resistance and edge toughness. The HM chipbreaker is specifically designed for medium-duty machining, featuring a unique rake angle that ensures smooth chip breaking even in gummy materials, significantly reducing tool pressure and heat buildup.
Key Core Advantages
- [✓] Advanced CVD Coating: Multi-layer Al2O3/TiCN coating provides an excellent thermal barrier for high-speed cutting.
- [✓] HM Chipbreaker Technology: Optimized for stainless steel, providing superior chip control at varying depths of cut.
- [✓] Substrate Stability: High-impact resistance prevents edge chipping during light interrupted cuts.
Technical Specifications
Model Nomenclature Breakdown
Square
7° Relief
Tolerance
Fixing
9.525mm
3.97mm
0.4 Rad
| Feature | Metric (ISO) | Imperial (ANSI) |
|---|---|---|
| Insert Model | SCMT09T304-HM | SCMT 3(2.5)1-HM |
| Inscribed Circle | 9.525 mm | 0.375 in |
Recommended Cutting Parameters
| Material | Speed (Vc) | Feed (fn) |
|---|---|---|
| Stainless Steel (Austenitic) | 140 - 240 m/min | 0.10 - 0.30 mm/r |
| Stainless Steel (Duplex) | 80 - 150 m/min | 0.08 - 0.25 mm/r |
Search Compatible Tool Holders:
Fits SSDCN / SSBCR / SSGCR Tool Holders (09 Size)
View Matching Holders →Main Applications
- Outer diameter (OD) turning and boring of stainless steel shafts.
- Ideal for 304, 316, and 400 series stainless.
- Suitable for semi-finishing to medium roughing operations.
- Stable performance on CNC lathes and turn-mill centers.
Troubleshooting
- Notched Wear: Increase lead angle or use varying DOC.
- Built-up Edge: Increase cutting speed (Vc) or check coolant concentration.
- Chip Entanglement: Increase feed rate to engage HM chipbreaker.
Real Global User Feedback
"The YBM251 grade is remarkably consistent on 316 SS. The HM chipbreaker makes life much easier."
— David K., USA 🇺🇸"Ottimo rapporto qualità-prezzo. Utilizzate su inox con risultati professionali."
— Marco V., Italy 🇮🇹"Great tool life. Faster shipping than expected. Will order again."
— Hans G., Germany 🇩🇪"Sharp edges and stable coating. Good for medium-duty work."
— Takashi H., Japan 🇯🇵AI-Style FAQ
Q: What is the difference between SCMT and SCGT?
A: SCMT is a molded insert with a chipbreaker for steel/stainless, while SCGT is usually ground and polished for aluminum or fine finishing.
Q: Is YBM251 better than YBG205 for stainless steel?
A: YBM251 (CVD) is generally better for medium-to-heavy turning due to its thicker coating. YBG205 (PVD) is often preferred for finishing and small parts.
Q: What does the HM chipbreaker do?
A: The HM (Medium) geometry is designed to break chips effectively in stainless steel at moderate feed rates, preventing long "bird-nesting" chips.
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.