BEYOND WC25-3D-SD21-WC04 Indexable U-Drill | 21mm 3D CNC Insert Drill Body
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BEYOND WC25-3D-SD21-WC04
Precision 3D Indexable U-Drill | 21mm Industrial CNC Tooling
High-Efficiency 21mm Indexable Holemaking
The BEYOND WC25-3D-SD21-WC04 is a professional-grade indexable insert drill engineered for rapid material removal in heavy-duty CNC machining. As a specialized fast hole U-drill, it features a 21mm cutting diameter with a 3D depth ratio. Optimized for high-speed internal cooling drilling, it provides exceptional stability and efficient chip evacuation in carbon steel, alloy steel, and stainless steel.
Model Code Specification
Technical Data & Units 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 (3D) | 63.0 mm | 2.480" |
Material Integrity & Optimized Spiral Flutes
Body Material: Crafted from high-performance quenched alloy steel (20CrMnTi), this WC04 insert holder is built to withstand extreme torque. The nickel-plated surface minimizes friction and prevents chip welding during intensive CNC lathe operations.
Spiral Flute Design: The oversized spiral flute geometry is designed for "forced" chip removal, significantly reducing the risk of chip-packing in 21mm deep-hole drilling.
Recommended Cutting Parameters
Optimize your metal boring efficiency with these baseline settings for 21mm WC drills:
- Cutting Speed (Vc): 110 - 200 m/min (Material dependent).
- Feed Rate (f): 0.05 - 0.10 mm/rev.
- Rotation Speed (N): $$N = \frac{Vc \times 1000}{\pi \times 21}$$
- Coolant Strategy: High-pressure internal cooling is mandatory for clearing chips from depth.
WC U-Drill: Advantages & Considerations
- Uses WCMX / WCMT inserts with 3 usable cutting edges (Economic choice).
- Stable entry on rough or curved workpieces.
- Lower cutting resistance compared to square insert designs.
- Requires high spindle power (kW) for 21mm diameter.
- Tolerance is roughly +0.15mm; best for roughing before finishing.
Verified Customer Feedback
"Runs very smooth"
Lars E. (Norway)
"Perfect for 21mm bores"
David W. (USA)
"Great Cooling"
Kenji S. (Japan)
"Excellent Rigid Body"
Marc F. (France)
"Fast Delivery"
Liam G. (Australia)
Frequently Asked Questions
Q: Does this include the WCMX04 inserts?
A: No, this is the 21mm U-drill body only. It includes the insert screws and the Torx wrench.
Q: Can I use this for blind holes?
A: Yes, it is ideal for both through-holes and blind holes in heavy industrial CNC machining.
Q: What is the benefit of the WC trigon insert?
A: It provides 3 usable cutting edges per insert, reducing your cost-per-hole significantly.
Pro-Tip: Choosing the Right Depth (2D to 5D)
The L/D ratio is critical for CNC holemaking success:
- 2D/3D (This Model): Maximum rigidity; best for standard diameters and machines with high torque but lower RPM.
- 4D: The universal standard for general purpose drilling.
- 5D: Specialized long reach drilling. Requires extreme coolant pressure to maintain hole straightness.
Need Help With BEYOND Inserts?
Looking for a BEYOND equivalent, alternative grade, or sample catalog? Our CNC specialists have helped 50+ manufacturers in aerospace, automotive, and medical machining source the right tooling at 30–50% lower cost than OEM prices.
This BEYOND insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.