BEYOND WC25-2D-SD21-WC04 Indexable U-Drill | 21mm CNC Fast Hole Drill Body
Price shown is a starting point. Contact us for a precise quote based on your requirements.
BEYOND WC25-2D-SD21-WC04
Industrial 21mm 2D Indexable U-Drill | High-Performance CNC Boring Body
Efficient 21mm Indexable Fast Hole Drilling
The BEYOND WC25-2D-SD21-WC04 is a precision-engineered indexable insert drill designed for rapid material removal in CNC machining centers. As a professional fast hole U-drill, it offers a 21mm cutting diameter with a 2D depth ratio and a 25mm shank. This tool is optimized for internal cooling drilling across carbon steel, alloy steel, and stainless steel, ensuring maximum productivity for large diameter metal boring projects.
Model Code Specification Breakdown
Technical Data & Metric/Imperial Comparison
| Feature | Metric Model (mm) | Imperial Equivalent (Inch) |
|---|---|---|
| Cutting Diameter (SD) | 21.0 mm | 0.826" |
| Shank Diameter | 25.0 mm | 0.984" |
| Max Drilling Depth (2D) | 42.0 mm | 1.653" |
| Product Model | WC25-2D-SD21 | WC0.98-2D-SD0.82 |
Material Excellence & Advanced Flute Design
Premium Body Material: Built from professional-grade 20CrMnTi alloy steel, the tool body undergoes a vacuum quenching process. This results in a high surface hardness to resist wear and a toughened core to absorb shocks during high-torque metal boring. The anti-vibration properties are essential for maintaining precision in high-speed drilling.
Optimized Spiral Flute (U-Slot): This indexable drill body features an enlarged spiral flute (U-groove geometry) designed for rapid chip evacuation. When paired with internal coolant drilling, chips are flushed out instantly, preventing heat accumulation and ensuring a superior surface finish in shallow hole drilling.
Recommended Cutting Parameters
Achieve optimal results for the 21mm U-drill with these baseline recommendations:
- Cutting Speed (Vc): 120 - 200 m/min (Material dependent).
- Feed Rate (f): 0.05 - 0.14 mm/rev.
- Rotation Speed (N): Calculated as $$N = \frac{Vc \times 1000}{\pi \times 21}$$
- Coolant Strategy: Internal cooling is mandatory to ensure chip flow and tool longevity.
WC Type U-Drill: Advantages & Considerations
- Uses WC trigon inserts with 3 cutting edges (High economy-per-edge).
- Stable entry on curved or sloped surfaces.
- Lower cutting resistance compared to SP square insert drills.
- Roughing tolerance typically falls within (+0.1/-0.2mm).
- Requires consistent high-pressure internal coolant.
Verified Customer Feedback
"Excellent Rigid Body"
Dieter K. (Germany)
"Perfect for 21mm holes"
Mark S. (USA)
"Rapid chip removal"
Hiroshi Y. (Japan)
"Better than original"
Luca R. (Italy)
"Great CNC tool"
Mateo S. (Spain)
Frequently Asked Questions
Q: Does this include the Torx wrench and screws?
A: Yes, each BEYOND drill body package includes high-strength insert screws and the correct Torx wrench.
Q: Can I use this for blind holes?
A: Yes. The WC U-drill leaves a relatively flat bottom, making it suitable for blind hole boring.
Q: Is internal cooling necessary?
A: Absolutely. To ensure the 21mm diameter clears metal chips effectively, internal coolant is required.
Quick Tip: 2D-5D CNC Drill Selection Guide
Rigidity is key for tool life. 2D drills (like this SD21 model) offer maximum stiffness and are best for high-feed roughing. 3D to 5D drills are used for deeper holes but require higher coolant pressure and reduced feed rates to prevent tool deflection or breakage.
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.