BEYOND SP C40-3D-SD41-SP11 Indexable U-Drill Body | 41mm 3D CNC Boring Drill
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BEYOND SP C40-3D-SD41-SP11
41mm 3D Heavy-Duty U-Drill | Precision Blind Hole Boring Specialist
Industrial-Grade 41mm Indexable Boring Solution
The BEYOND SP C40-3D-SD41-SP11 is a high-performance indexable insert drill engineered for maximum stability in large diameter boring operations. With a 41mm cutting diameter and a 3D depth ratio (123mm reach), this tool is the primary choice for blind hole machining. Utilizing internal cooling and a precision-engineered spiral flute, it ensures rapid chip evacuation and superior surface finish on heavy-duty CNC lathes.
Decoding the Model: SP C40-3D-SD41-SP11
Metric & Imperial Technical Specifications
| Feature | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Drilling Diameter (SD) | 41.0 mm | 1.614" |
| Shank Diameter (C) | 40.0 mm | 1.575" |
| Max Drilling Depth (3D) | 123.0 mm | 4.842" |
| Equivalent Model | SP-C1.575-3D-SD1.614-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 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 123mm deep bores instantly, preventing chip accumulation and protecting the carbide inserts during blind hole machining.
Recommended Cutting Parameters (41mm 3D)
Suggested for Carbon Steel and Alloy Steel. Adjust based on machine rigidity:
- Cutting Speed (Vc): 120 - 180 m/min
- Feed Rate (f): 0.07 - 0.15 mm/rev
- Rotation Speed (N): Calculated as $$N = \frac{Vc \times 1000}{\pi \times 41}$$
- Coolant: High-pressure internal cooling is mandatory for 41mm 3D depth.
Looking for a compatible side-lock holder for the 40mm shank?
SHOP COMPATIBLE C40 TOOL HOLDERSVerified Global Reviews
"Impressive 41mm Stability"
"I use this for blind holes in 4140 steel. The rigidity of the BEYOND body is superior to others I've tried. Very stable at 3D depth."
- Robert H. (Germany)
"Efficient Chip Dispersal"
"No more bird nesting. The spiral flutes and internal coolant work perfectly together."
- Marek W. (Poland)
"Great value tool. The SPMG11 pocket is very precise. Excellent surface finish on the hole bottom."
- Pedro S. (Brazil)
"Shipping was fast to the UK. BEYOND tools are becoming our standard in the shop."
- Arthur L. (UK)
"Professional quality. We run this 41mm U-drill on our Geely production line components."
- Y. Watanabe (Japan)
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 profile).
- Reinforced body core provides maximum rigidity for 41mm diameters.
- Requires higher machine torque compared to smaller diameters.
- Dependency on high-pressure internal coolant flow for 123mm reach.
Technical Q&A
Q: Why choose SP over WC for blind hole drilling?
A: SP square inserts create a significantly flatter bottom. The SP body is also designed with a thicker core, which is essential for stability in large diameter boring.
Q: Is this tool body compatible with all SPMG11 inserts?
A: It is designed for standard SPMG110408 carbide inserts. Using BEYOND inserts is recommended for the best fit and tool life.
Q: Can this be used on a manual lathe?
A: It is highly recommended for CNC machining due to the feed rate and torque requirements, but can be used on powerful manual lathes with a rigid setup.
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 large diameter machining.
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 for 41mm 3D heavy-duty tasks.
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.