BEYOND SP C40-4D-SD49-SP14 U Drill | 49mm 4D Indexable Blind Hole Drill
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BEYOND SP C40-4D-SD49-SP14
49mm 4D Precision U-Drill | The Blind Hole Machining Specialist
High-Performance 49mm Indexable Shallow Hole Drill
The BEYOND SP C40-4D-SD49-SP14 is a premium indexable insert drill engineered for high-stability CNC machining. Unlike WC drills, the SP series is specifically optimized for blind hole machining, ensuring a flatter bottom and superior structural integrity. With a 49mm cutting diameter and a 4D depth ratio (196mm reach), it is the professional choice for large-diameter metal removal in alloy and carbon steels.
Decoding the Model: SP C40-4D-SD49-SP14
Metric & Imperial Technical Specifications
| Feature | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Drilling Diameter (SD) | 49.0 mm | 1.929" |
| Shank Diameter (C) | 40.0 mm | 1.575" |
| Max Drilling Depth (4D) | 196.0 mm | 7.716" |
| Imperial Equivalent Model | SP-C1.50-4D-SD1.929-SP14 | |
20CrMnTi Alloy & Advanced Spiral Flute Geometry
Durable Alloy Steel: The U-drill body is forged from high-quality 20CrMnTi alloy steel, vacuum-quenched to reach a hardness of HRC 52-56. This ensures the shallow hole drill can withstand extreme heat and vibration without deforming.
Optimized Geometry: The spiral flute design is specifically widened for 49mm drilling to handle massive chip loads. Equipped with dual internal cooling holes, it directs high-pressure coolant straight to the SPMG140512 carbide inserts, preventing "chip packing" during deep 4D drilling cycles.
Recommended Cutting Parameters (49mm 4D)
Optimized for stable CNC Machining Centers and Lathes:
- Cutting Speed (Vc): 110 - 160 m/min
- Feed Rate (f): 0.08 - 0.18 mm/rev
- Internal Coolant: Mandatory (High pressure required for 4D depth).
- Rotation Speed Calculation: $$N = \frac{Vc \times 1000}{\pi \times 49}$$
SP Series U-Drill: Advantages & Considerations
- Excellent for Blind Hole Boring (Square inserts).
- Higher body rigidity compared to WC drills.
- 4-cutting edges per insert (Highly economical).
- Higher cutting torque required vs. WC type.
- Not recommended for low-rigidity machinery.
Need a compatible 40mm holder for this drill?
SHOP C40 SIDE-LOCK HOLDERSVerified Customer Reviews
"Solid 49mm body. Using it for blind holes in 4140 steel. Exceptional finish."
- Thomas G. (USA)
"Excellent quality. The internal cooling works perfectly at full 4D depth."
- Marco L. (Italy)
"Strongest U-drill I've used for this price. No vibration at 150 m/min."
- Hans S. (Germany)
"Fast shipping to UK. Product is exactly as described. High rigidity."
- James P. (UK)
"Very good tool for CNC lathes. Great for boring 49mm holes quickly."
- Akira T. (Japan)
Frequently Asked Questions
Q: What is the main difference between SP and WC drills?
A: SP drills use square inserts and are best for blind holes because they produce a flatter bottom. WC drills use trigon inserts and are more economical for through holes.
Q: Can I use this on a manual lathe?
A: Not recommended. U-drills require high rigidity and consistent feed rates found in CNC machines.
Q: Does it come with a cooling pipe?
A: Yes, standard internal cooling screws and wrenches are included, but inserts are sold separately.
Machinist Tip: Choosing the Right U-Drill
SP Series: Specialized for Blind Hole Machining. Square inserts provide 4 cutting edges and better vertical stability for deep bores.
WC Series: Specialized for Through Hole Machining. Trigon inserts are easier to drive but less rigid for blind bottom finishes.
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.