BEYOND SP C40-4D-SD39.5-SP11 Indexable U-Drill Body | 39.5mm 4D CNC Deep Hole Drill
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BEYOND SP C40-4D-SD39.5-SP11
39.5mm 4D Heavy-Duty U-Drill | High-Rigidity Blind Hole Boring Specialist
Industrial 39.5mm High-Efficiency Boring Specialist
The BEYOND SP C40-4D-SD39.5-SP11 is a professional indexable insert drill engineered for extreme stability in deep hole boring. With a 39.5mm cutting diameter and a 4D depth ratio (158mm reach), this tool is the primary choice for blind hole machining. Featuring internal cooling and a high-efficiency spiral flute, it ensures rapid chip evacuation and superior surface finish on CNC lathes and machining centers. This rapid drill is optimized for high-torque operations in steel, alloy, and cast iron.
Decoding the Model: SP C40-4D-SD39.5-SP11
Metric & Imperial Technical Specifications
| Feature | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Drilling Diameter (SD) | 39.5 mm | 1.555" |
| Shank Diameter (C) | 40.0 mm | 1.575" |
| Max Drilling Depth (4D) | 158.0 mm | 6.220" |
| Equivalent Model | SP-C1.575-4D-SD1.555-SP11 | |
Premium 20CrMnTi Steel & Advanced Spiral Flute
Industrial Grade Material: This indexable drill body is forged from 20CrMnTi high-strength alloy steel. The surface is vacuum-quenched to reach HRC 52-55, providing immense wear resistance and preventing tool deflection during large diameter drilling. The shock-resistant core is perfect for handling interrupted cuts in heavy-duty machining.
High-Efficiency Spiral Flute (U-Groove): The specialized U-groove geometry features wide, polished chip pockets designed for massive chip flow. Combined with dual internal cooling holes, it allows high-pressure coolant to flush metal chips out of deep bores instantly, preventing chip packing and protecting the carbide inserts from heat failure during blind hole machining.
Recommended Cutting Parameters (39.5mm 4D)
Suggested for Carbon Steel (HB < 250). Adjust based on machine rigidity:
- Cutting Speed (Vc): 110 - 180 m/min
- Feed Rate (f): 0.08 - 0.18 mm/rev
- Rotation Speed (N): Calculated as $$N = \frac{Vc \times 1000}{\pi \times 39.5}$$
- Coolant: High-pressure internal cooling is mandatory for 4D depth.
Need a side-lock tool holder for your 40mm shank U-Drill?
SHOP COMPATIBLE C40 TOOL HOLDERSVerified Customer Reviews
"Exceptional Stability"
"I was worried about 39.5mm at 4D reach, but the BEYOND body is rock solid. Minimal vibration."
- David H. (USA)
"Perfect Blind Holes"
"The flat bottom from the SP inserts is exactly what we needed for our blind bores. Great tool."
- Klaus M. (Germany)
"Very fast shipping to Brazil. The surface finish is excellent."
- Ricardo S. (Brazil)
"Using this on a CNC lathe. Chip evacuation is smooth with thru-coolant."
- Mark B. (Australia)
"Excellent price-to-performance ratio compared to our previous brand."
- S. Patel (India)
SP Series Indexable Drill: Advantages & Considerations
- Uses 4-edge SPMG square inserts for lower cost per edge.
- Optimized for Blind Hole Machining (Flatter hole bottom).
- Reinforced core provides superior rigidity for 4D deep bores.
- Higher torque/power requirement for 39.5mm diameter.
- Coolant pressure is critical for chip removal at 158mm depth.
Technical Q&A
Q: Why is SP better than WC for blind holes?
A: SP square inserts provide a flatter profile at the bottom of the bore. The SP tool body also has a thicker core, providing the rigidity needed for deep holes.
Q: Does this include the inserts?
A: No, this is for the tool body only. It is compatible with SPMG110408 carbide inserts.
Q: Can I use this on a CNC lathe without a rotating spindle?
A: Yes, as long as you have internal coolant through the turret and proper alignment.
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 4D deep hole boring.
WC Series (Trigon): Primarily used for Through Hole applications. WC inserts offer more cutting 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.