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.
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.