BEYOND SP C25-5D-SD20.5-SP06 Indexable U-Drill Body | 20.5mm 5D CNC Deep Hole Drill
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BEYOND SP C25-5D-SD20.5-SP06
20.5mm 5D Indexable U-Drill | Precision Blind Hole Boring Specialist
Industrial 20.5mm Deep Hole Boring Specialist
The BEYOND SP C25-5D-SD20.5-SP06 is a professional-grade indexable insert drill engineered for high-precision metal boring on CNC lathes. With a 20.5mm cutting diameter and a 5D depth ratio (102.5mm drilling depth), this fast hole U-drill is specifically optimized for blind hole machining. Featuring internal cooling and a robust spiral flute, it ensures high-speed efficiency and superior surface finish.
What Does the Model Code Mean?
Metric & Imperial Technical Specifications
| Feature | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Drilling Diameter (SD) | 20.5 mm | 0.807" |
| Shank Diameter (C) | 25.0 mm | 0.984" |
| Drilling Depth (5D) | 102.5 mm | 4.035" |
| Equivalent Model | SP-C1.0-5D-SD0.807-SP06 | |
20CrMnTi Alloy & Advanced Spiral Flute
Superior Tool Body Material: This indexable drill body is forged from 20CrMnTi high-strength alloy steel. The surface is vacuum-quenched to achieve HRC 50-55, providing immense wear resistance while the core remains shock-resistant to handle interrupted cuts during deep hole boring.
Optimized U-Groove Flute: The specialized U-groove spiral flute geometry features wider chip pockets. Combined with dual internal cooling holes, it allows high-pressure coolant to flush metal chips out of 102.5mm deep bores instantly, preventing chip packing and protecting the carbide inserts from thermal failure.
Recommended Cutting Parameters (5D 20.5mm)
Suggested for Carbon Steel (HB < 250). Adjust based on rigidity:
- Cutting Speed (Vc): 110 - 170 m/min
- Feed Rate (f): 0.05 - 0.10 mm/rev
- Rotation Speed (N): Calculated as $$N = \frac{Vc \times 1000}{\pi \times 20.5}$$
- Coolant: High-pressure internal cooling (Min 1.5 MPa) is mandatory for 5D.
SP Series U-Drill: Advantages & Considerations
- Uses 4-edge SPMG square inserts (Higher cost-efficiency).
- Exceptional stability and verticality for Blind Hole Machining.
- Thicker tool core provides higher rigidity than WC types for 5D reach.
- Requires more spindle power/torque than trigon (WC) drills.
- Sensitive to low-pressure coolant systems in 5D depths.
Verified Customer Feedback
"Solid Deep Bores"
"Running this for 100mm deep blind holes. Zero vibration and perfect diameter control."
- Mark T. (USA)"Superior Rigidity"
"The 20CrMnTi steel is very tough. Much better bottom finish than the WC drills we used to use."
- Hans B. (Germany)"Excellent price-to-performance ratio. BEYOND tools never disappoint."
- Kenji Y. (Japan)
"Top tier indexable drill for blind holes."
- Liam G. (UK)
"Arrived fast and works exactly as described."
- Luca M. (Italy)
Technical Support Q&A
Q: Why is SP better for blind holes?
A: SP square inserts create a flatter bottom profile and the tool body has a thicker core, providing maximum rigidity at 5D depth.
Q: Is a pilot hole required?
A: For 5D (102.5mm), we recommend starting with a short 2D U-drill starter hole to ensure the tool enters perfectly straight.
Q: Can I use this on a manual lathe?
A: U-drills require high torque and constant feed. We recommend using them on CNC machines with internal coolant capability.
Machinist Tip: SP vs. WC U-Drills
SP Series (Square): The professional choice for Blind Hole (Blind Bores). Square inserts create a flatter bottom and offer maximum core strength for 5D depths.
WC Series (Trigon): Primarily used for Through Hole applications. WC inserts offer 6 edges but the body core is thinner, making it less rigid than SP for extreme depths.
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.