BEYOND SP C40-3D-SD39-SP11 Indexable U-Drill Body | 39mm 3D CNC Boring Drill
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BEYOND SP C40-3D-SD39-SP11
39mm 3D Heavy-Duty U-Drill | High-Rigidity Blind Hole Specialist
Industrial-Grade 39mm Indexable Boring Solution
The BEYOND SP C40-3D-SD39-SP11 is a professional indexable insert drill designed for high-torque large diameter boring. With a 39mm cutting diameter and a 3D depth ratio (117mm reach), this tool is the industry standard for blind hole machining. Featuring precision-engineered internal cooling and a robust spiral flute, it ensures efficient chip evacuation and exceptional surface finish on CNC lathes and machining centers.
Decoding the Model: SP C40-3D-SD39-SP11
Metric & Imperial Technical Specifications
| Feature | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Drilling Diameter (SD) | 39.0 mm | 1.535" |
| Shank Diameter (C) | 40.0 mm | 1.575" |
| Max Drilling Depth (3D) | 117.0 mm | 4.606" |
| Equivalent Model | SP-C1.575-3D-SD1.535-SP11 | |
Hardened 20CrMnTi Alloy & High-Volume Spiral Flute
Industrial-Grade Build: Forged from premium 20CrMnTi alloy steel, this indexable drill body undergoes vacuum quenching (HRC 52-55) to provide the extreme rigidity needed for large diameter drilling. The surface is treated with Black Oxide to resist corrosion and wear, ensuring longevity in high-heat CNC boring environments.
Advanced Spiral Flute: The U-drill features an optimized spiral flute (U-groove) design. Combined with dual internal cooling holes, it allows high-pressure coolant to flush metal chips out of 117mm deep bores instantly, preventing chip accumulation and protecting the carbide inserts during blind hole machining.
Recommended Cutting Parameters (39mm 3D)
Suggested for Carbon Steel and Alloy Steel. Use the formula below for your CNC setup:
Rotation Speed (N) = (Vc × 1000) / (π × 39)
Where: Vc = Cutting Speed | π ≈ 3.14 | D = 39mm (Drill Diameter)
- Cutting Speed (Vc): 120 - 180 m/min
- Feed Rate (f): 0.08 - 0.16 mm/rev
- Coolant: High-pressure internal cooling is mandatory for 3D depth.
Looking for a compatible side-lock holder for the 40mm shank?
SHOP COMPATIBLE C40 TOOL HOLDERSVerified Global Reviews
"Solid 39mm Performance"
"Using this for deep blind bores in steel. Rigid core and no vibration. Much better than the previous brand we used."
- Robert H. (Germany)
"Clean Chip Evacuation"
"Coolant through holes are powerful. No chip jamming even at full 117mm depth."
- Marek W. (Poland)
"Precision is 10/10. SPMG11 inserts fit very tightly. Perfect for high-volume shops."
- Pedro S. (Brazil)
"Arrived in 8 days. Professional industrial quality for our CNC lathe."
- Arthur L. (UK)
"Runs smoothly on Fanuc machines. Reliable supplier for B2B needs."
- Y. Watanabe (Japan)
SP Series Indexable Drill: Advantages & Considerations
- Uses 4 cutting edges (SPMG), reducing cost per hole.
- Optimized for Blind Hole Machining (Flatter bottom).
- Thick core provides higher rigidity for 39mm diameter torque.
- Needs significant machine horsepower to drive a 39mm drill.
- Coolant pressure must be maintained for chip clearance.
Technical Q&A
Q: What is the primary difference between SP and WC U-drills?
A: SP models use square inserts and are designed for blind holes because they leave a flatter bottom. WC models use trigon inserts and are better for through holes.
Q: Do I need to buy special bolts?
A: No, the drill comes with the necessary Torx screws and wrench. You only need to purchase SPMG110408 inserts.
Q: Can I use this for off-center drilling?
A: Yes, indexable drills can handle slight radial offsets to adjust hole size, provided the setup is rigid.
Machinist Tip: SP vs. WC U-Drills
SP Series: Specialist for Blind Bores. The square insert geometry provides superior stability in large diameter tasks, resulting in higher precision for bottom-end machining.
WC Series: Specialist for Through Hole applications. While WC offers more edges per insert, the tool body core for WC is typically thinner, making SP the preferred choice for heavy 39mm boring operations.
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.