CCMT120408-HM YBM251 Carbide Turning Insert | ZCC.CT | CVD Coated | 10pcs
Price shown is a starting point. Contact us for a precise quote based on your requirements.
ZCC.CT CCMT120408-HM YBM251: Precision Turning Inserts for Stainless Steel
Product Overview
"Which insert is the most versatile for medium turning of 304 and 316 stainless steel with stable tool life?"
The ZCC.CT CCMT120408-HM YBM251 is a high-performance turning insert specifically engineered for the M-group (Stainless Steel) material spectrum. The YBM251 grade features a specialized tough carbide substrate coupled with an advanced PVD coating, providing excellent resistance to thermal shock and notch wear. Integrated with the HM (Medium) chipbreaker, this insert excels in general-purpose machining, ensuring smooth chip evacuation and preventing built-up edge, even in challenging austenitic stainless steels.
Key Features
- Advanced YBM251 PVD Grade: High coating adhesion reduces friction and heat buildup in gummy stainless materials.
- HM Versatile Geometry: Optimized for medium cutting depths, offering a perfect balance between sharpness and edge strength.
- Superior Notch Wear Resistance: Specifically designed to combat the work-hardening characteristics of stainless steel.
- Excellent Surface Finish: Precision-ground edges ensure mirror-like finishes on precision components.
Technical Specifications
ISO Model Breakdown (CCMT 120408-HM)
80° Diamond
7° Relief
Tolerance
Hole/Chipbreak
12.9mm Edge
4.76mm Thick
0.8mm Radius
Medium Cut
| Metric Model | ANSI/Imperial Equivalent |
|---|---|
| CCMT120408-HM | CCMT 432-HM |
Recommended Cutting Data
| Workpiece Material | Cutting Speed (Vc) | Feed rate (fn) |
|---|---|---|
| Stainless Steel (M10-M25) | 150 - 240 m/min | 0.10 - 0.35 mm/rev |
| Superalloys (S) | 40 - 90 m/min | 0.08 - 0.25 mm/rev |
Compatibility & Mounting
Designed for External and Internal Boring:
Fits all standard S-Type screw-clamping tool holders.
Applications
This insert is the industrial choice for Medium Machining of stainless parts in:
ZCC.CT Grade Quick Guide (Stainless Turning)
| Grade | Condition | Application Focus |
|---|---|---|
| YBM151 | Stable / Continuous | High Speed / Finishing |
| YBM251 | Universal / General | Medium Cut / Reliability |
Why Professionals Choose Us?
"Excellent for 304 Stainless"
"Switched from a major European brand to YBM251. The tool life is just as good, if not better, on our CNC lathes."
— Markus J., Germany
"Consistent Quality"
"The HM chipbreaker is very reliable for medium passes. No issues with built-up edge on our stainless fittings."
— Robert T., USA
"Great Value"
"Very durable inserts. We use them for all our general stainless machining projects in Japan."
— Kenji S., Japan
"Process Stability"
"Chips break predictably, which is vital for our automated cell. No bird-nesting issues at all."
— Luca V., Italy
Frequently Asked Questions
Q: Can YBM251 be used for steel?
A: While optimized for Stainless Steel (M), it can perform well in some Steel (P) applications. However, for dedicated steel machining, we recommend the YBC series.
Q: Is this insert compatible with boring bars?
A: Yes, as long as the boring bar uses CCMT 1204 inserts with a 7-degree relief angle.
Q: Does this insert require flood coolant?
A: For stainless steel, high-pressure flood coolant is strongly recommended to control heat and ensure optimal chip evacuation.
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.