ZCC.CT DCMT11T304-HR YBM251 Carbide Turning Inserts for Stainless Steel
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DCMT11T304-HR YBM251 Roughing Inserts
Product Overview
The DCMT11T304-HR YBM251 is a 55° rhombic positive insert purpose-built for Stainless Steel (M-Class). Unlike standard finishing inserts, the -HR (Heavy Roughing) chipbreaker features a wider landing and a reinforced cutting edge designed to handle interrupted cuts and large depths of cut. Paired with the YBM251 Grade—a combination of a high-toughness substrate and thick CVD coating—this insert provides the thermal stability needed to combat work-hardening in materials like 304 and 316 stainless steel.
Key Advantages
- ✔ YBM251 Second-Gen Grade: Enhanced CVD multi-layer coating for M20–M35 applications, offering superior resistance to plastic deformation.
- ✔ -HR Roughing Geometry: A heavy-duty chipbreaker that excels in deep cuts, forcing chips to break even in ductile stainless materials.
- ✔ High Edge Reliability: Optimized for stability in variable cutting depths, reducing the risk of sudden edge failure.
- ✔ CVD Thermal Shield: Protects the carbide substrate from the high heat generated during heavy roughing.
Nomenclature Decoding
55° Rhombic
7° Relief
Tol. M
Hole Feature
11.6mm L
3.97mm S
0.4mm Radius
Technical Specifications
| Standard | Metric (ISO) | Inch (ANSI) |
|---|---|---|
| Designation | DCMT11T304-HR | DCMT 32.51-HR |
| Inscribed Circle | 9.525 mm | 0.375" |
| Nose Radius | 0.4 mm | 0.016" |
Recommended Cutting Data (Roughing)
| Cutting Speed (Vc) | 100 - 200 m/min |
| Feed Rate (fn) | 0.15 - 0.40 mm/rev |
| Depth of Cut (ap) | 1.0 - 4.0 mm |
Matching Tool Holders
Optimized for SDJCR/L and SDUCR/L Holders:
SDJCR1616H11 | SDJCR2020K11 | S16Q-SDUCR11
Shop Holders & Boring Bars →Target Materials
- 304/316 Austenitic Stainless
- Duplex & Super Duplex Steel
- Work-Hardened Stainless Parts
- Martensitic Stainless Steels
Grade Strategy
- YBM251 (Current): Focus on stability and interrupted cuts.
- YBM151: Better for high-speed continuous finishing.
- YBG205: PVD option for high-precision fine finishing.
Why Choose ZCC.CT?
ZCC.CT is a global leader in cemented carbide research. The YBM series has been tested in the most demanding automotive and aerospace workshops to ensure that every DCMT insert delivers predictable tool life and maximum metal removal rates (MRR), significantly lowering your cost-per-part.
Global Customer Feedback
⭐⭐⭐⭐⭐
"Roughing beast in 316"
We were struggling with chip wrapping on our CNC lathes. The -HR breaker finally solved it. Tools last much longer.
— Marcus J., USA⭐⭐⭐⭐⭐
"Top für Edelstahl"
Sehr stabile Schneidkante. YBM251 is the perfect middle ground for our production shop.
— Dietrich B., Germany⭐⭐⭐⭐
"Ottimo prodotto"
Used for roughing duplex shafts. Good performance at 120m/min.
— Alessandro P., Italy⭐⭐⭐⭐⭐
"信頼できる安定性"
Interrupted cuts in stainless are always scary, but these inserts hold up beautifully.
— Sato T., JapanFrequently Asked Questions
A: No. The -HR geometry is designed for heavier depths of cut. For finishing, please use the -HF or -HM geometries to ensure better surface quality.
A: Yes, high-pressure coolant is strongly recommended when machining stainless steel to improve chip evacuation and reduce thermal load.
A: For this 11 size insert with the -HR breaker, we recommend staying within a 1.0mm to 4.0mm ap range for optimal performance.
Material Comparison Tip: For high-speed machining of Austenitic Stainless Steel, YBM251 is the primary choice. However, if you face heavy intermittent cuts or severe vibration, consider using the YBG205 (PVD) grade for increased edge toughness.
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.