BEYOND SP C40-5D-SD39.5-SP11 Indexable U-Drill | 39.5mm CNC Deep Hole Drill Body
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BEYOND SP C40-5D-SD39.5-SP11
Industrial 39.5mm 5D Deep Hole U-Drill | Professional CNC Indexable Boring Body
High-Efficiency 39.5mm Deep Hole Machining
The BEYOND SP C40-5D-SD39.5-SP11 is a high-performance indexable insert drill engineered for large-diameter metal removal. Featuring a 39.5mm cutting diameter and a massive 5D depth-to-diameter ratio, this fast hole U-drill is the ultimate solution for deep hole boring in heavy industrial workpieces. Designed for CNC lathe metal boring, it utilizes optimized internal cooling to handle extreme thermal loads during high-speed drilling in carbon steel, alloy, and stainless steel.
Model Identification Guide
Technical Data & Metric/Imperial Conversion
| Feature | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Drilling Diameter (SD) | 39.5 mm | 1.555" |
| Shank Diameter (C) | 40.0 mm | 1.574" |
| Max Drilling Depth (5D) | 197.5 mm | 7.775" |
| Compatible Inserts | SPMG110408 | SPMG 432 |
High-Rigidity 20CrMnTi Alloy & Advanced Spiral Flute
Industrial-Grade Body Material: Deep hole drilling with a 39.5mm diameter generates immense torque and thermal energy. This indexable drill body is forged from 20CrMnTi high-strength alloy steel. The body is vacuum-quenched to achieve high surface hardness with a flexible core, ensuring it withstands long-reach boring up to 197.5mm without catastrophic failure.
Large-Capacity Spiral Flute (U-Groove): The spiral flute geometry is extra-wide to accommodate the massive chip load. Paired with dual internal cooling holes, it ensures that chips are flushed from the bottom of the cavity instantly, protecting the SPMG11 carbide inserts from re-cutting and heat buildup.
Recommended Cutting Parameters (5D 39.5mm)
Optimize your CNC machining with these baseline settings:
- Cutting Speed (Vc): 100 - 160 m/min (Standard Steel).
- Feed Rate (f): 0.08 - 0.15 mm/rev.
- Rotation Speed (N): Calculated as $$N = \frac{Vc \times 1000}{\pi \times 39.5}$$
- Requirement: High-pressure internal cooling (Min 1.5 MPa) is mandatory for 5D depth.
SP Type U-Drill: Advantages & Considerations
- Uses SPMG square inserts with 4 usable cutting edges (most cost-effective).
- Superior verticality and straightness in deep 5D holes.
- Better wall finish than WC-type drills in large diameters.
- High cutting force; requires a machine with high spindle power.
- Coolant volume is critical to flush large chip loads.
Verified Customer Feedback
"Workhorse Tool"
"Drilling 39.5mm holes in structural steel. Stable and fast. BEYOND quality is top-notch."
- Jonathan R. (USA)"Efficient chip flow"
"The spiral flute works great with high-pressure coolant. No chip packing even at 5D depth."
- Lukas H. (Germany)"Fast Shipping"
"Body is very rigid. Perfect fit for my CNC setup."
- Hiro T. (Japan)"Solid build"
- Alessandro P. (Italy)
"Excellent value"
- Francois L. (France)
Technical Support Q&A
Q: What is the benefit of the Side-Lock (C40) shank?
A: The C40 shank allows for massive clamping force, preventing the tool from rotating in the holder during high-torque 39.5mm drilling.
Q: Is a pilot hole required for 5D drilling?
A: For maximum precision in 5D depths, we recommend a short 2D U-drill starter hole (approx. 20mm) to guide the 5D tool.
Q: Does this include the inserts?
A: No, this is the tool holder only. You can find our compatible high-performance SPMG11 inserts in the "Inserts" category.
Technical Tip: WC vs. SP U-Drills
WC Series (Trigon): Best for general purpose and low spindle power machines. Lower cost per edge but less rigid.
SP Series (Square): The professional choice for Deep Hole (5D) applications. The 4-edge SPMG square insert provides superior balance and a thicker tool core, resulting in straighter holes and better dimensional tolerance in heavy-duty CNC machining.
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.