ZCC.CT DCMT11T304-HM YBM251 Carbide Turning Inserts for Stainless Steel
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DCMT11T304-HM YBM251 Turning Inserts
Product Overview
The DCMT11T304-HM YBM251 is a high-performance 55° rhombic positive insert specifically engineered for Stainless Steel (M-Class). By utilizing the YBM251 Grade—which features a specialized CVD coating with high thermal stability and impact resistance—this insert excels in medium-duty turning. The -HM (Medium-Duty) chipbreaker is designed with a reinforced edge and optimized rake angle to manage the high cutting forces and work-hardening characteristic of stainless materials.
Key Advantages
- ✔ YBM251 Grade Technology: A tough substrate combined with thick CVD coating for M15–M35 applications, offering superior notch wear resistance.
- ✔ -HM Chipbreaker: Optimized for medium cutting depths, ensuring stable chip breaking and reducing the risk of built-up edge (BUE).
- ✔ High Thermal Stability: Maintains cutting edge integrity even under high-temperature continuous machining.
- ✔ Versatile Application: Ideal for both internal boring and external turning of stainless steel components.
Nomenclature Decoding
55° Rhombic
7° Relief
Tol. M
Hole/Feature
11.6mm Edge
3.97mm Thick
0.4mm Radius
Technical Specifications
| Standard | Metric (ISO) | Inch (ANSI) |
|---|---|---|
| Designation | DCMT11T304-HM | DCMT 32.51-HM |
| Inscribed Circle | 9.525 mm | 3/8" |
| Thickness | 3.97 mm | 5/32" |
Recommended Cutting Data
| Cutting Speed (Vc) | 120 - 220 m/min |
| Feed Rate (fn) | 0.10 - 0.30 mm/rev |
| Depth of Cut (ap) | 0.5 - 3.0 mm |
Matching Tool Holders
Compatible with standard SDJCR/L or SDUCR/L Holders:
SDJCR2020K11 | SDJCR1616H11 | S20R-SDUCR11
Shop Compatible Holders →Target Materials
- Austenitic Stainless Steel (304, 316)
- Duplex Stainless Steel (2205)
- Precipitation Hardening Steel (17-4PH)
- Ferritic & Martensitic Stainless Steels
Material Comparison
- YBM251 (Current): General purpose for semi-finishing stainless.
- YBM151: Higher speed, stable finishing of stainless.
- YBG205: Optimized PVD grade for high-precision finishing.
Why Choose ZCC.CT Tools?
As a global leader in cemented carbide technology, ZCC.CT provides high-precision CNC solutions that reduce costs and increase productivity. The YBM series is internationally recognized for its stability in difficult-to-machine materials, ensuring your workshop achieves mirror-like finishes and consistent tool life.
Verified Customer Reviews
⭐⭐⭐⭐⭐
"Exceptional tool life in 316"
We use YBM251 in our Ohio shop for pump components. The chip control is fantastic at medium speeds.
— David S., USA⭐⭐⭐⭐⭐
"Top Performance"
Consistent quality across batches. The -HM breaker is very versatile for various stainless grades.
— Klaus H., Germany⭐⭐⭐⭐
"Affidabile e Preciso"
Great for semi-finishing. Excellent surface finish on austenitic steel shafts.
— Roberto M., Italy⭐⭐⭐⭐⭐
"コストパフォーマンス最高"
Stable performance in heavy production runs. Highly recommended for CNC lathes.
— Hiroshi T., JapanFrequently Asked Questions
A: While YBM251 has high thermal stability, using high-pressure coolant is highly recommended for stainless steel to prevent work hardening and improve tool life.
A: -HM is for medium-duty semi-finishing with larger depths of cut, while -HF is designed for high-precision light finishing with smaller feed rates.
A: Yes, the YBM251 grade is tough enough to handle the higher cutting forces and abrasion of 2205 duplex steel.
Material Comparison Tip: For high-speed machining of Austenitic Stainless, YBM251 is the primary choice. However, if you are machining small components with thin walls, the YBG205 (PVD) grade might offer lower cutting forces to prevent part deflection.
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.