BEYOND WC25-4D-SD21-WC04 U-Drill | 21mm Indexable Insert Drill (4D Depth)
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BEYOND WC25-4D-SD21-WC04
Professional 4D Indexable U-Drill | 21mm High-Precision CNC Tooling
Industrial-Grade 21mm Indexable Drilling
The BEYOND WC25-4D-SD21-WC04 is a high-rigidity indexable insert drill engineered for rapid metal removal. Featuring a 21mm cutting diameter and a 4D depth-to-diameter ratio, this tool is the definitive choice for high-speed internal cooling drilling. Optimized for heavy-duty CNC machining, it provides exceptional stability in carbon steel, alloy steel, and stainless steel.
Model Code Specification
Technical Data & Metric/Imperial Comparison
| Feature | Metric Model (mm) | Imperial Equivalent (Inch) |
|---|---|---|
| Cutting Diameter (SD) | 21.0 mm | 0.827" |
| Shank Diameter | 25.0 mm | 0.984" |
| Max Drilling Depth (4D) | 84.0 mm | 3.307" |
Recommended Cutting Parameters
Achieve optimal results in metal holemaking by following these standard guidelines:
- Cutting Speed (Vc): 120 - 200 m/min (Material dependent).
- Feed Rate (f): 0.05 - 0.15 mm/rev.
- Coolant Strategy: High-pressure internal coolant is mandatory for 21mm diameters to flush chips effectively and protect the tool body.
Premium Material & Optimized Spiral Flute
Constructed from high-performance alloy steel with specialized anti-vibration quenching, this WC04 insert holder ensures maximum rigidity. The wide spiral flute geometry is specifically engineered for "forced" chip removal, preventing chip-packing—the primary cause of tool failure in 21mm deep hole drilling. The nickel-plated body minimizes friction and prevents chip welding during high-speed operations.
WC Series U-Drill: Advantages & Considerations
- Uses WCMX / WCMT inserts with 3 usable cutting edges (Highly cost-effective).
- Stable performance on uneven or curved entry surfaces compared to SP series.
- Excellent chip breaking on low-carbon and alloy steels.
- Requires higher spindle torque and machine power.
- Surface finish may require secondary finishing for high-precision bores.
Product Q&A
A: Yes, the WC series is designed for both through-holes and blind holes with flat bottoms.
A: Yes, each 21mm U-drill body includes the correct Torx wrench and insert screws.
Verified Customer Reviews
"Excellent Stability" - Hans G. (Germany)
The 4D length works perfectly on our CNC lathe for 4140 steel.
"Best Value Drill" - Mark T. (USA)
Switched from a name brand to BEYOND. No difference in tool life!
"High Efficiency" - Hiroshi S. (Japan)
Internal coolant ports are perfectly aligned. Chips flow smoothly.
"Rugged Body" - Ricardo M. (Brazil)
Nickel coating is very durable. Using it for batch production.
"Fast Shipping" - Liam O. (UK)
Arrived in London within a week. Tool performs as described.
Pro-Tip: Choosing Drill Depth (2D to 5D)
The L/D ratio is critical for CNC tooling success:
- 2D/3D: Maximum rigidity; best for shallow holes and high-feed roughing.
- 4D (This Model): The balanced universal standard for industrial deep-hole machining.
- 5D: Specialized deep-hole drill bit. Requires extreme coolant pressure to maintain hole straightness.
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.